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Posted 8 Jul 2018
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ASP.NET Core Blazor Master/Detail CRUD with Filtering and Sorting using EF and Web API

, 31 Jul 2018
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In this article, let’s see how to create our own ASP.NET Core Blazor Master Detail HTML CRUD (Insert, Update, Select and Delete) for both Master and Detail Grid with Sorting and Filtering using Entity Framework, and Web API.

Introduction

In this article, let’s see how to create our own ASP.NET Core Blazor Master Detail HTML CRUD (Insert, Update, Select and Delete) for both Master and Detail Grid with Sorting and Filtering using Entity Framework, and Web API.

Kindly read my previous articles which explain in depth about getting started with ASP.NET Core Blazor.

This article will explain:

  • How to Create Order Master and Order Detail table with sample records inserted
  • How to create an ASP.NET Core Blazor Web application
  • How to install the Package for using Entity Framework and creating DBContext class
  • Create a separate WEB API for both Order Master and Order Detail
  • How to get result from Web API and bind result in Blazor client Razor view to display our Master/Detail HTML grid
  • Add Sorting /Filtering features for Master HTML grid
  • Add/Edit/ and Delete each Order Master and Order Detail from grid

Background

Prerequisites

Make sure that you have installed all the prerequisites in your computer. If not, then download and install all, one by one. Note that since Blazor is the new framework and we must have installed preview of Visual Studio 2017 (15.7) or above.

Using the Code

We will create an Order Master and Order Detail table to be used for the Master and Detail Grid data binding. The following is the script to create a database, table and sample insert query. Run this script in your SQL Server.

use master 
--create DataBase 
-- 1) Check for the Database Exists .If the database is exist then drop and create new DB 
IF EXISTS (SELECT [name] FROM sys.databases WHERE [name] = 'OrderManagement' ) 
DROP DATABASE OrderManagement 
GO 
 
CREATE DATABASE OrderManagement 
GO 
 
USE OrderManagement 
GO  
 
-- Create OrderMasters Table 
 
CREATE TABLE [dbo].[OrderMasters](  
[Order_No] INT IDENTITY PRIMARY KEY,  
[Table_ID] [varchar](20) NOT NULL,  
[Description] [varchar](200) NOT NULL,  
[Order_DATE] [datetime] NOT NULL,  
[Waiter_Name] [varchar](20) NOT NULL 
) 
 
-- Insert OrderMasters sample data 
 
INSERT INTO [OrderMasters]  
          ([Table_ID] ,[Description],[Order_DATE],[Waiter_Name])  
    VALUES  
          ('T1','Order for Table T1',GETDATE(),'SHANU' )  
     
INSERT INTO [OrderMasters]  
          ([Table_ID] ,[Description],[Order_DATE],[Waiter_Name])  
    VALUES  
           ('T2','Order for Table T2',GETDATE(),'Afraz' )  
          
INSERT INTO [OrderMasters]  
          ([Table_ID] ,[Description],[Order_DATE],[Waiter_Name])  
     VALUES  
             ('T3','Order for Table T3',GETDATE(),'Afreen')               
             
CREATE TABLE [dbo].[OrderDetails](  
  [Order_Detail_No] INT IDENTITY PRIMARY KEY, 
 [Order_No] INT, 
 [Item_Name] [varchar](20) NOT NULL,   
 [Notes] [varchar](200) NOT NULL,  
[QTY]  INT NOT NULL,  
 [Price] INT NOT NULL  
 ) 
 
--Now let’s insert the 3 items for the above Order No 'Ord_001'.  
 
INSERT INTO [OrderDetails]  
          ( [Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (1,'Ice Cream','Need very Cold',2 ,160)  
 
INSERT INTO [OrderDetails]  
          ([Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (1,'Coffee','Hot and more Suger',1 ,80)            
 
          INSERT INTO [OrderDetails]  
          ([Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (1,'Burger','Spicy',3 ,140)  
          
          INSERT INTO [OrderDetails]  
          ([Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (2,'Pizza','More Chees and Large',1 ,350)   
          
          INSERT INTO [OrderDetails]  
          ([Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (2,'Cola','Need very Cold',3 ,50)  
          
          INSERT INTO [OrderDetails]  
          ([Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (3,'IDLY','Hot',3 ,40)  
 
          INSERT INTO [OrderDetails]  
          ([Order_No],[Item_Name],[Notes],[QTY] ,[Price])  
   VALUES  
          (3,'Thosa','Hot',3 ,50)  
 
-- To Select and test Order Master and Details 
 
Select * FROM OrderMasters 
 
Select * From OrderDetails 

Step 2 - Create ASP.NET Core Blazor Application

After installing all the prerequisites listed above and ASP.NET Core Blazor Language Services, click Start >> Programs >> Visual Studio 2017 >> Visual Studio 2017 on your desktop. Click New >> Project. Select Web >> ASP.NET Core Angular Web Application. Enter your project name and click OK.

Select Blazor (ASP.NET Core hosted) and click ok.

After creating ASP.NET Core Blazor Application, wait for few seconds. You will see the below structure in solution explorer.

What is New in ASP.NET Core Blazor Solution?

When we create our new ASP.NET Core Blazor application, we can see as there will be 3 projects that will be automatically created in the solution Explorer.

Client Project

The first project created is the Client project and it will be as our Solutionname.Client and here, we can see our Solutionname as “BlazorASPCORE”. As the project named as client and this project will be mainly focused for all the client-side view. Here, we will be adding all our page view to be displayed in the client side in browser.

We can see a few sample pages have been already added here and we can also see a shared folder which is the same as our MVC application where will be having the Sharedfolder and Layout page for the Master page. Here in Blazor, we have the MainLayout which will work like the Master page and NavMenu for the left side menu display.

Server Project

As the name indicates, this project will be used as a Server project. This project is mainly used to create all our Controllers and WEB API Controllers to perform all business logic and perform CRUD operation using WEB APIs. In our demo application, we will be adding a Web API in this Server project and all the WEB API in our Client application. This Server project will work like get/set the data from database and from our Client project, we bind or send the result to this server to perform the CRUD operation in database.

Shared Project

As the name indicates, this project works like a shared project. This project works as a Model for our Server project and for the Client project. The Model declared in this Shared project will be used in both the Server and in the Client project. We also install all the packages needed for our project here, for example to use the Entity Framework, we install all the packages in this Shared project.

Run to Test the Application

When we run the application, we can see that the left side has navigation and the right side contains the data. We can see as the default sample pages and menus will be displayed in our Blazor web site. We can use the pages or remove it and start with our own page.

Now let’s see how to add new page perform the CRUD operation for maintain Order details.

Using Entity Framework

To use the Entity Framework in our Blazor application, we need to install the below packages.

Install the Packages

Go to Tools and then select -> NuGet Package Manager -> Package Manager Console.

You can see the Console at the bottom of the VS 2017 IDE and at the right side of the combobox on the console, select the Default project as your shared project ”Select Shared”.

  • You can see the PM> and copy and paste the below line to install the Database Provider package. This package is used to set the database provider as SQL Server.
Install-Package Microsoft.EntityFrameworkCore.SqlServer

We can see as the package is installed in our Shared folder.

Install the Entity Framework.

You can see the PM> and copy and paste the below line to install the EF package.

Install-Package Microsoft.EntityFrameworkCore.Tools

To create DB Context and set the DB Connection string:

You can see the PM> and copy and paste the below line set the Connection string and create DB Context. This is an important part as we give our SQL Server name, Database Name and SQL server UID and SQL Server Password to connect to our database to display our Master/Detail Grid. We also give our both SQL Table name “OrderMasters, OrderDetails” to create the Model class in our Shared project.

Scaffold-DbContext "Server= SQLServerName;Database=OrderManagement;
user id=SQLID;password=SQLPWD;Trusted_Connection=True;MultipleActiveResultSets=true" 
Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models -Tables OrderMasters ,OrderDetails

Press enter create connection string, Model Class and Database Context.

We can see OrderMasters and OrderDetails Model class and OrderManagementContext class has been created in our Shared project. We will be using this Model and DBContext in our Server project to create our Web API to perform the CRUD operations.

Creating Web API for Get Order Details

To create our WEB API Controller, right click Controllers folder. Click Add New Controller.

Here, we will be using Scaffold method to create our WEB API. We select API Controller with actions, using Entity Framework.

Select our Model and DatabaseContext from the Shared project.

Select our OrderMasters Model from the Shared Project for performing the CRUD operation.

Select the Data Context Class as our OrderManagementContext from the Shared project. Our Controller name will be automatically added if you need, you can change it and click the ADD.

We will be using all the Get/Post/Put and Delete methods from our Web API.

Same like this, we also create a Web API for our OrderDetails.

To test Get method, we can run our project and copy the GET method API path. Here, we can see our API path to get api/OrderMasters/.

Run the program and paste API path to test our output.

For OrderDetails, we can pass the Order No to get only one Order details. Here, we can see the result for Order No as “1” ,we call the Web API as /api/OrderDetails/1.

Now we will bind all this WEB API Json result in our Razor View page from our Client project for displaying the Master/Detail HTML table for performing CRUD operations and also with Filtering and Sorting options.

Working with Client Project

Note: In this article, we will create 2 Razor pages. In one Razor page, we will create the Master Details HTML table with normal binding method and in another Razor page, we bind the Detail table using Blazor Dynamic Content.

Razor Page with Normal Binding

First, we need to add the new Razor view page.

Add Razor View

To add the Razor view page, right click the Pages folder from the Client project. Click on Add >> New Item

Select Razor View >> Enter your page name. Here, we have given the name as Orders.cshtml.

In Razor view Page, we have 3 parts of code as first is the Import part where we import all the references and models for using in the view, HTML design and data bind part and finally, we have the function part to call all the web API to bind in our HTML page and also to perform client-side business logic to be displayed in View page.

Import Part

First, we import all the needed support files and references in our Razor View page. Here, we have first imported our Model class to be used in our view and also imported HTTPClient for calling the Web API to perform the CRUD operations.

@using MasterDetailCRUD.Shared
@using MasterDetailCRUD.Shared.Models
@page "/Orders"
@using Microsoft.AspNetCore.Blazor.Browser.Interop

@using System.Collections.Generic
@using Microsoft.AspNetCore.Blazor

Master HTML Grid Data Bind Part

Next, we design our Order page to bind the Order Master and Order Detail results from the Web API to HTML table.

Binding Order Master Details

In the Init method, we get the Order Master from Web API and bind the result in HTML table using foreach loop. Here, we bind the result for Order Master Grid and in each row first column, we add the Toggle image and, in this Toggle image click event, we call the getOrderDetails(OrderNo) method to display the Detail HTML grid for the related Order. We pass the Order No to the function and we get the related Order details for the Order and bind the result in detail grid. Also, we will show the detail grid only when the toggle image button is clicked and if the toggle button clicked again, we hide the detail grid. We also have Edit and Delete buttons to edit and delete the Order Master record from database.

@foreach (var OrderMasterobj in ordMaster)
        {
            <tr style="border-style:dashed;border-width:2px;border-color: 
            @(OrderMasterobj.OrderNo == orderIDs ? "#ff6a00": "#a2aabe")">
                <td align="center" style="border: 
                solid 1px #659EC7; padding: 5px;table-layout:fixed;">

                    @if (@OrderMasterobj.OrderNo == orderIDs)
                    {
                        <img src="@Imagename" onclick="@(async () => 
                        await getOrderDetails(@OrderMasterobj.OrderNo))" />
                    }
                    else
                    {
                        <img src="Images/toggle.png" onclick="@(async () => 
                        await getOrderDetails(@OrderMasterobj.OrderNo))" />

                    }

                </td>
                <td align="center" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        <img src="Images/edit.gif" alt="Edit" 

                        width="24px" height="24px" onclick="@(async () => 
                        await EditOrderMaster(@OrderMasterobj.OrderNo))" />
                    </span>
                </td>
                <td align="center" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        <img src="Images/delete.gif" alt="Delete" 

                        width="24px" height="24px" onclick="@(async () => 
                        await DeleteOrderMaster(@OrderMasterobj.OrderNo))" />
                    </span>
                </td>
                <td align="left" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        @OrderMasterobj.OrderNo
                    </span>
                </td>
                <td align="left" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        @OrderMasterobj.TableId
                    </span>
                </td>
                <td align="left" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        @OrderMasterobj.Description
                    </span>
                </td>
                <td align="left" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        @OrderMasterobj.OrderDate
                    </span>
                </td>
                <td align="left" style="border: solid 1px #659EC7; 
                padding: 5px;table-layout:fixed;">
                    <span style="color:#9F000F">
                        @OrderMasterobj.WaiterName
                    </span>
                </td>
            </tr>

Function Part

Function part to call all the web API to bind in our HTML page and also to perform client-side business logic to be displayed in View page.

Init Method

In the Init method, we get the result of Web API for Order Master and store it in the ordMaster object and we are using this object to be bind in our HTML table using the foreach statement.

@functions {
    OrderMasters[] ordMaster;
    OrderDetails[] ordDetail;

    OrderMasters ordsM = new OrderMasters();
    OrderDetails ordsD = new OrderDetails();

    Boolean showAddMaster = false;
    Boolean showAddDetail = false;

    int showDetailStatus = 0;
    int sortStatus = 0;
    int orderIDs = 0;
    string Imagename = "Images/toggle.png";
    string ImageSortname = "Images/sortAsc.png";
    string Messages = "";
    protected override async Task OnInitAsync()
    {
        ordMaster = await Http.GetJsonAsync<OrderMasters[]>("/api/OrderMasters/");
        ordsD = new OrderDetails();
        ordsM = new OrderMasters();
        Messages = "";
    }

Adding Sorting Features in Table Heading

Here, we have added the Sorting and Filtering features only for the Master HTML table. If needed, then we can implement this same feature for Detail grid as well.

In the Master Table heading part for each heading, we add the Sorting Image. In Sorting Image Button Click event, we call the Sorting function and pass each Sorting Column name to the click event. In Function code part, we sort the Web API and display the result by ascending and in descending order by each column header sorting image click.

<table style=" background-color:#FFFFFF; border: solid 2px #6D7B8D; 
padding: 5px;width: 99%;table-layout:fixed;" cellpadding="2" cellspacing="2">

        <tr style="height: 30px; background-color:#336699 ; color:#FFFFFF ;border: solid 1px #659EC7;">
            <td width="120"></td>
            <td width="40" align="center"><b>Edit</b></td>
            <td width="40" align="center"><b>Delete</b></td>
            <td width="120" align="center" style="cursor: pointer;">
                <b>OrderNo</b> &nbsp;
                <img src="@ImageSortname" onclick="@(async () => 
                await OrderMasterSorting("OrderNo"))" height="24" width="24" />

            </td>
            <td width="240" align="center" style="cursor: pointer;">
                <b>Table Name</b> &nbsp;
                <img src="@ImageSortname" onclick="@(async () => 
                await OrderMasterSorting("TableId"))" height="24" width="24" />

            </td>
            <td width="240" align="center" style="cursor: pointer;">
                <b>Description</b> &nbsp;
                <img src="@ImageSortname" onclick="@(async () => 
                await OrderMasterSorting("Description"))" height="24" width="24" />

            </td>
            <td width="120" align="center" style="cursor: pointer;">
                <b> Order Date</b> &nbsp;
                <img src="@ImageSortname" onclick="@(async () => 
                await OrderMasterSorting("OrderDate"))" height="24" width="24" />
            </td>
            <td width="340" align="center" style="cursor: pointer;">
                <b> Waiter Name</b> &nbsp;
                <img src="@ImageSortname" onclick="@(async () => 
                await OrderMasterSorting("WaiterName"))" height="24" width="24" />

            </td>
        </tr>

Sorting Method

In Sorting image click on each column heading, we call this method and pass the column name to this method. In this method depending on column name, we do Sorting the Web API result and bind the result in the HTML table. We also do the vice versa sorting of Ascending and descending.

//Order Master

    protected async Task OrderMasterSorting(string SortColumn)
    {
        ordMaster = await Http.GetJsonAsync<OrderMasters[]>("/api/OrderMasters/");
        Messages = "";

        if (sortStatus == 1)
        {
            ImageSortname = "Images/sortDec.png";
            sortStatus = 0;

            switch (SortColumn)
            {
                case "OrderNo":
                    ordMaster = ordMaster.OrderBy(x => x.OrderNo).ToArray();
                    break;
                case "TableId":
                    ordMaster = ordMaster.OrderBy(x => x.TableId).ToArray();
                    break;

                case "Description":
                    ordMaster = ordMaster.OrderBy(x => x.Description).ToArray();
                    break;
                case "OrderDate":
                    ordMaster = ordMaster.OrderBy(x => x.OrderDate).ToArray();
                    break;
                case "WaiterName":
                    ordMaster = ordMaster.OrderBy(x => x.WaiterName).ToArray();
                    break;
            }
        }
        else
        {
            ImageSortname = "Images/sortAsc.png";
            sortStatus = 1;

            switch (SortColumn)
            {
                case "OrderNo":
                    ordMaster = ordMaster.OrderByDescending(x => x.OrderNo).ToArray();
                    break;
                case "TableId":
                    ordMaster = ordMaster.OrderByDescending(x => x.TableId).ToArray();
                    break;

                case "Description":
                    ordMaster = ordMaster.OrderByDescending(x => x.Description).ToArray();
                    break;
                case "OrderDate":
                    ordMaster = ordMaster.OrderByDescending(x => x.OrderDate).ToArray();
                    break;
                case "WaiterName":
                    ordMaster = ordMaster.OrderByDescending(x => x.WaiterName).ToArray();
                    break;
            }
        }
    }

Adding Filtering Features in Table Heading

In the Table heading part, we add a new row. In table row, we add the Textbox for each column to perform the filtering for the binded result. In Textbox onChange event, we call the method to perform the Filtering operation from the code function part.

<tr style="height: 30px; background-color:#336699 ; color:#FFFFFF ;">
            <td width="140" align="center" colspan="4">
                <img src="Images/filter.png" width="24" height="24" /> Filter By
            </td>
            <td width="180" align="center" style="border: 
            solid 1px #FFFFFF; padding: 5px;table-layout:fixed;">
                <input width="70" 

                onchange=@OnTableIdChanged oninput="
                (this.dispatchEvent(new CustomEvent('change', {bubbles: true})))" />
            </td>
            <td width="180" align="center" style="border: 
            solid 1px #FFFFFF; padding: 5px;table-layout:fixed;">
                <input width="70" onchange=@OnDescriptionChanged 

                oninput="(this.dispatchEvent(new CustomEvent('change', {bubbles: true})))" />
            </td>
            <td width="180" align="center" 

            style="border: solid 1px #FFFFFF; padding: 5px;table-layout:fixed;"></td>
            <td width="180" align="center" 

            style="border: solid 1px #FFFFFF; padding: 5px;table-layout:fixed;">
                <input width="70" 

                onchange=@OnWaiterNameChanged oninput="
                (this.dispatchEvent(new CustomEvent('change', {bubbles: true})))" />
            </td>
        </tr>

Filtering Method

In each column heading part, we have added a new row for performing the Filtering of the HTML grid. In each column filter Textbox Change event, we pass the Textbox value. We call a common filtering method OrderMasterFilteringList and in this method, we pass the filtering column Textbox value and column Name.

// For Filtering by OrderNo
    void OnOrderNoChanged(UIChangeEventArgs args)
    {
        string values = args.Value.ToString();
        OrderMasterFilteringList(values, "OrderNo");
    }

    // For Filtering by TableId
    void OnTableIdChanged(UIChangeEventArgs args)
    {
        string values = args.Value.ToString();
        OrderMasterFilteringList(values, "TableId");
    }

    // For Filtering by Description
    void OnDescriptionChanged(UIChangeEventArgs args)
    {
        string values = args.Value.ToString();
        OrderMasterFilteringList(values, "Description");
    }

    // For Filtering by OrderDate
    void OnOrderDateChanged(UIChangeEventArgs args)
    {
        string values = args.Value.ToString();
        OrderMasterFilteringList(values, "OrderDate");
    }

    // For Filtering by WaiterName
    void OnWaiterNameChanged(UIChangeEventArgs args)
    {
        string values = args.Value.ToString();
        OrderMasterFilteringList(values, "WaiterName");
    }

Here, we create a common function named as OrderMasterFilteringList and in this method, we get the filtering column Textbox value and column Name. We do filtering from the Web API and bind the filtering result to the HTML Table.

//Filtering
    protected async Task OrderMasterFilteringList(String Value, string columnName)
    {
        ordMaster = await Http.GetJsonAsync<OrderMasters[]>("/api/OrderMasters/");

        Messages = "";
        if (Value.Trim().Length > 0)
        {
            switch (columnName)
            {
                case "TableId":
                    ordMaster = ordMaster.Where(x => x.TableId.Contains(Value)).ToArray();
                    break;
                case "Description":
                    ordMaster = ordMaster.Where(x => x.Description.Contains(Value)).ToArray();
                    break;
                case "WaiterName":
                    ordMaster = ordMaster.Where(x => x.WaiterName.Contains(Value)).ToArray();
                    break;
            }
        }
        else
        {
            ordMaster = await Http.GetJsonAsync<OrderMasters[]>("/api/OrderMasters/");
        }
    }

Insert New Order Master

In the ADD New Order Master button click, we will make visible the New Order Master Add table, where the user can enter the new Order information.

<table width="100%" style="background:#05163D;color:honeydew">
    <tr>
        <td width="20">&nbsp;</td>
        <td>
            <h2> Add New Order Master Information</h2>
        </td>
        <td>&nbsp;</td>
        <td align="right">
            <button class="btn btn-info" 

            onclick="@AddNewOrderMasters">Add New Order</button>
        </td>
        <td width="10">&nbsp;</td>
    </tr>
    <tr>
        <td colspan="2"></td>
    </tr>
</table>

For a new Order Master, we will make the OrderNo as 0. In the New Order Master save button click, we will call the save method.

When Add New Order button is clicked, we show the Add/Edit Order Master, here user can update or add new Order Master.

@if (showAddMaster == true)
{
    <table style=" background-color:#FFFFFF; border: dashed 3px #6D7B8D; 
    padding: 5px;width: 99%;table-layout:fixed;" cellpadding="2" cellspacing="2">
        <tr style="height: 30px; background-color:#336699 ; 
        color:#FFFFFF ;border: solid 1px #659EC7;">
            <td>
                <h3> Add/Edit Order Master</h3>
            </td>

        </tr>
        <tr>
            <td>
                <table class="form-group">
                    <tr>
                        <td>
                            <label for="Name" 

                            class="control-label">Order No</label>
                        </td>
                        <td>
                            <input type="text" 

                            class="form-control" bind="@ordsM.OrderNo" readonly />
                        </td>
                        <td width="20">&nbsp;</td>
                        <td>
                            <label for="Name" 

                            class="control-label">Table Name</label>
                        </td>
                        <td>
                            <input type="text" 

                            class="form-control" bind="@ordsM.TableId" />
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <label for="Email" 

                            class="control-label">Description</label>
                        </td>
                        <td>
                            <input type="text" class="form-control" 

                            bind="@ordsM.Description" />
                        </td>
                        <td width="20">&nbsp;</td>
                        <td>
                            <label for="Name" class="control-label">Date</label>
                        </td>
                        <td>
                            <input type="text" class="form-control" 

                            bind="@ordsM.OrderDate" />
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <label for="Name" class="control-label">Waiter Name</label>
                        </td>
                        <td>
                            <input type="text" class="form-control" 

                            bind="@ordsM.WaiterName" />
                        </td>
                        <td width="20">&nbsp;</td>
                        <td></td>
                        <td>
                            <button type="submit" class="btn btn-success" 

                            onclick="@(async () => await SaveOrderMasters())" 

                            style="width:220px;">Save</button>
                        </td>
                    </tr>
                </table>
            </td>
        </tr>
    </table>

Save Method

In the Save method, we will check for the OrderNo. If the OrderNo is “0”, then it will insert the new Order Master. Here, we will call the Insert Web API method and if the OrderNo is > 0, then it means to update the Order record.

//Save New or update Order Master
    protected async Task SaveOrderDetails()
    {
        if (ordsD.OrderDetailNo == 0)
        {
            await Http.SendJsonAsync(HttpMethod.Post, "/api/OrderDetails/", ordsD);
        }
        else
        {
            await Http.SendJsonAsync(HttpMethod.Put, "/api/OrderDetails/" + ordsD.OrderDetailNo, ordsD);
        }

        ordDetail = await Http.GetJsonAsync<OrderDetails[]>
                    ("/api/OrderDetails/" + Convert.ToInt32(ordsD.OrderNo));
        ordsD = new OrderDetails();
        showAddDetail = false;
        showAddMaster = false;
        Messages = "Order Detail Saved to Database !";
    }

Update Order Master

The same as Insert, we will display the update details for the user to edit the Order Master and save it. In the Edit method, we will get all the details for the row where the user clicks on the Edit Icon and sets all the results to the appropriate TextBox. In the Save button click, we will call the save method to save all the changes to the database like Insert.

//Edit Order Master
    protected async Task EditOrderMaster(int OrderNos)
    {
        showAddMaster = true;
        ordsM = await Http.GetJsonAsync<OrderMasters>("/api/OrderMasters/" + 
                Convert.ToInt32(OrderNos));
    }

Delete Order Master Details

In the Delete button click, we will delete the Order by passing the OrderNo to the delete method of the Web API to delete the record from the database.

//Delete Order Master
    protected async Task DeleteOrderMaster(int OrderNos)
    {
          await Http.DeleteAsync("/api/OrderMasters/" + Convert.ToInt32(OrderNos));

        ordMaster = await Http.GetJsonAsync<OrderMasters[]>("/api/OrderMasters/");
        Messages = "Order Master Deleted from Database !";
    }

Detail Grid

Bind the Detail Grid Result

Firstly, we check the OrderDetail result is null, if it’s not null then we bind the result in HTML Table, before binding the result, we also check for the showDetailStatus ==1 which means to show or hide the Detail Grid. By default, we set the showDetailStatus as 0 and in Master grid Toggle image click event, we change the status to 1 and if the showDetailStatus is 1 then we display the Detail grid, we also check the Master grid OrderNo with Order detail and bind the result in Detail Grid.

@if (ordDetail != null)
            {
                @if (showDetailStatus == 1)
                {
                    @if (@OrderMasterobj.OrderNo == orderIDs)
                    {
                        <tr style="background-color:#6D7B8D ; 
                        color:honeydew ;
                        border-style:dashed;border-width:2px;
                        border-color:#ECF3F4;">
                            <td colspan="8" 

                            align="center">
                                Order Details of  
                                Order NO - <strong> @OrderMasterobj.OrderNo 
                                </strong> ,
                                Total @ordDetail.Length  details for this Order
                            </td>
                        </tr>
                        <tr>
                            <td valign="top">
                                <button class="btn btn-info" 

                                onclick="@(async () => 
                                await AddNewOrderDetails
                                (@OrderMasterobj.OrderNo))">Add New Detail</button>
                            </td>
                            <td colspan="7">

                                <table style="background-color:#ECF3F4; border: solid 2px #3273d5; 
                                padding: 5px;width: 99%;table-layout:fixed;">

                                    <tr style="height: 30px; background-color:#336699 ; 
                                    color:#FFFFFF ;">
                                        <td width="40" 

                                        align="center"><b>Edit</b></td>
                                        <td width="40" 

                                        align="center"><b>Delete</b></td>
                                        <td width="240" 

                                        align="center">
                                            <b> Order Number</b>
                                        </td>
                                        <td width="240" align="center">
                                            <b>  Order Detail Number</b>
                                        </td>
                                        <td width="120" align="center">
                                            <b> Item Name</b>
                                        </td>
                                        <td width="340" align="center">
                                            <b>Comments</b>
                                        </td>
                                        <td width="120" align="center">
                                            <b>  QTY</b>
                                        </td>
                                        <td width="120" align="center">
                                            <b> Price</b>
                                        </td>
                                    </tr>
                                    @foreach (var orderDetailsObj in ordDetail)
                                    {
                                        <tr>
                                            <td align="center" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">
                                                <span style="color:#9F000F">
                                                    <img src="Images/edit.gif" alt="Edit" 

                                                    width="24px" height="24px" 

                                                    onclick="@(async () => 
                                                    await EditOrderDetails(@orderDetailsObj.OrderDetailNo))" />
                                                </span>
                                            </td>
                                            <td align="center" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">
                                                <span style="color:#9F000F">
                                                    <img src="Images/delete.gif" alt="Delete" 

                                                    width="24px" height="24px" 

                                                    onclick="@(async () => 
                                                    await DeleteOrderDetails
                                                    (@orderDetailsObj.OrderDetailNo))" />
                                                </span>
                                            </td>
                                            <td align="center" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">
                                                @orderDetailsObj.OrderNo
                                            </td>
                                            <td align="center" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">

                                                <span style="color:#9F000F">
                                                    @orderDetailsObj.OrderDetailNo
                                                </span>
                                            </td>
                                            <td align="center" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;"> 
                                            <span style="color:#9F000F">
                                                    @orderDetailsObj.ItemName
                                                </span>
                                            </td>
                                            <td align="center" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">
                                                <span style="color:#9F000F">
                                                    @orderDetailsObj.Notes
                                                </span>
                                            </td>
                                            <td align="right" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">
                                                <span style="color:#9F000F">
                                                    @orderDetailsObj.Qty
                                                </span>
                                            </td>

                                            <td align="right" style="border: 
                                            solid 1px #659EC7; padding: 5px;table-layout:fixed;">
                                                <span style="color:#9F000F">
                                                    @orderDetailsObj.Price
                                                </span>
                                            </td>
                                        </tr>
                                    }

                                </table>

                            </td>
                        </tr>
                    }
                }
            }

Detail Grid bind, Hide/Show method

In the Master grid Toggle image click event, we call this below method and pass the Order NO to get the appropriate Order details from the Web API and bind the result in the detail HTML grid.

//--------------- Detail Grid CRUD

    protected async Task getOrderDetails(int ordID)
    {
        showAddMaster = false;
        showAddDetail = false;
        Messages = "";
        if (orderIDs != ordID)
        {
            Imagename = "Images/expand.png";
            showDetailStatus = 1;
        }
        else
        {
            if (showDetailStatus == 0)
            {
                Imagename = "Images/expand.png";
                showDetailStatus = 1;
            }
            else
            {
                Imagename = "Images/toggle.png";
                showDetailStatus = 0;
            }
        }
        orderIDs = ordID;
        ordDetail = await Http.GetJsonAsync<OrderDetails[]>
                     ("/api/OrderDetails/" + Convert.ToInt32(ordID));
    }

Order Detail Add/Edit and Delete

Same like the Order Master CRUD, we also do Insert/Edit and Delete for the Order Details. Here, from below gif image, we can see the Detail grid bind, Insert, Update and Delete operations.

Navigation Menu

Now we need to add this newly added Orders Razor page to our left Navigation. For adding this, open the Shared Folder and open the NavMenu.cshtml page and add the menu.

<li class="nav-item px-3">
            <NavLink class="nav-link" href="" Match=NavLinkMatch.All>
                <span class="oi oi-home" 

                aria-hidden="true"></span> Home
            </NavLink>
        </li>
        <li class="nav-item px-3">
            <NavLink class="nav-link" href="Orders">
                <span class="oi oi-plus" 

                aria-hidden="true"></span> Orders Master Detail
            </NavLink>
        </li>

Build and Run the Application

Points of Interest

In this article, we have added only one level of Hierarchy of grid, you can extend this to create multilevel Hierarchy of HTML grid. Note as when creating the DBContext and setting the connection string, don’t forget to add your SQL connection string. Hope you all like this article and in the next article, we will see more examples to work with Blazor and it's really very cool and awesome to work with Blazor.

History

  • 2018-07-09: MasterDetailCRUD.zip

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

syed shanu
Team Leader
India India
Microsoft MVP | Code Project MVP | CSharp Corner MVP | Author | Blogger and always happy to Share what he knows to others. MyBlog

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Comments and Discussions

 
SuggestionVideo Pin
AndreyPetrov@Ukraine10-Aug-18 11:40
memberAndreyPetrov@Ukraine10-Aug-18 11:40 
PraiseMessage Closed Pin
23-Jul-18 1:03
memberMember 1392252123-Jul-18 1:03 
QuestionASP.NET Core Blazor Master/Detail CRUD Pin
Azim200510-Jul-18 20:54
memberAzim200510-Jul-18 20:54 
QuestionUsing latest tech like Core and EF - why no code-first? Pin
BerggreenDK10-Jul-18 11:06
memberBerggreenDK10-Jul-18 11:06 
Questionissue Pin
Member 1026950810-Jul-18 6:14
memberMember 1026950810-Jul-18 6:14 
AnswerRe: issue Pin
syed shanu10-Jul-18 15:50
mvpsyed shanu10-Jul-18 15:50 
PraiseAwesome tutorial detailing full LOB application. Pin
vishal_saxena10-Jul-18 5:28
membervishal_saxena10-Jul-18 5:28 
GeneralRe: Awesome tutorial detailing full LOB application. Pin
syed shanu10-Jul-18 15:51
mvpsyed shanu10-Jul-18 15:51 
QuestionA few questions Pin
Dewey9-Jul-18 9:19
memberDewey9-Jul-18 9:19 

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