Re: design a printdocument control with a text and boxes like filling form - C# Discussion Boards

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Re: Tracking Data Changes

Gerry Schmitz16-Dec-19 12:06

Gerry Schmitz

16-Dec-19 12:06

Lots of options.

The constructors of the entities could set the information; calling a "shared" user "lookup".

Maybe user ids and actions should be logged; with only a reference to the entity id and a timestamp column value.

You could "crawl" the entities waiting to be committed and apply your "auditing" then.

Maybe you're tracking too many entities and only need to consider the parent / root of an object graph.

A combination of audit techniques that work well with the least fuss. Can you determine if someone is fudging with the data? Then your controls are adequate.

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food

How do you make a unit test of an empty linked list?

Melissa Anthonia13-Dec-19 7:56

Melissa Anthonia

13-Dec-19 7:56

I have tried unit testing before, but I have only worked with very simple strings where I inserted some values. I wanted to try something different, so I found this template which is made for practising. It has a class containing an empty linked list.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace UnitListX
{
    public class ListXwithErrors
    {
        // class with errors

        private Node list;
        private int size;
        public static object Add;
        public static int Size;

        // create a new empty list
        public ListXwithErrors()
        {
            list = null;
            size = 0;
        }

    }
}

I have not gotten very far with the test code.
I would appreciate if anyone could provide me with an example of how to make a unit test of this kind of code.

My test code.

using System;
using System.Collections.Generic;
using System.Xml.Linq;
using Microsoft.VisualStudio.TestTools.UnitTesting;
using UnitListX;

namespace UnitTestProject1
{
    [TestClass]
    public class ListTestClass
    {
        [TestMethod]
        public void TestList()
        {
            // arrange
            ListXwithErrors node = new ListXwithErrors();

            
            // act
           
            // assert

        }
    }
}

modified 13-Dec-19 14:40pm.

Re: How do you make a unit test of an empty linked list?

Melissa Anthonia13-Dec-19 9:13

Melissa Anthonia

13-Dec-19 9:13

Okay, so I tried this.
I am not sure if this is the correct way to write it.

// arrange
          ListXwithErrors node = new ListXwithErrors();

          // act
          node = null;
          // assert
          Assert.IsNull(node);

Re: How do you make a unit test of an empty linked list?

Gerry Schmitz13-Dec-19 12:49

Gerry Schmitz

13-Dec-19 12:49

You're not getting far because your don't have a "list"; you have something you called a list.

And an "empty" list is "not null"; it is just "empty".

List<string> list = new List<string>();  // is an "empty" list.

bool isEmpty = (list.Count == 0);  // tests for an "empty" list

It was only in wine that he laid down no limit for himself, but he did not allow himself to be confused by it.
― Confucian Analects: Rules of Confucius about his food

Re: How do you make a unit test of an empty linked list?

Melissa Anthonia13-Dec-19 13:45

Melissa Anthonia

13-Dec-19 13:45

I have tried this method, but when writing

List<string> list = new List<string>();

I do not get the option to refer to the class in my other cs file.
Remember, I have two files here: Program.cs and UnitTest1.cs.

This is why this one is so confusing to me.
For example, if I had a ordinary class with normal strings such as:

public class Car
    {
        private string model;
        private string colour;

        public Car(string model, string colour)
        {
            this.model = model;
            this.colour = colour;
        }

I would just write this in my test:

[TestClass]
   public class CarTestClass
   {
       [TestMethod]
       public void TestCar()
       {
           // arrange
           Car mycar = new Car("Renault", "flame red");
           Car myothercar = new Car("Volvo");

           //act
           string mymodel = mycar.Model;
           string mycolour = mycar.Colour;
           string myothermodel = myothercar.Model;
           string myothercolour = myothercar.Colour;

           // assert
           Assert.AreEqual("Renault", mymodel);
           Assert.AreEqual("flame red", mycolour);
           Assert.AreEqual("Volvo", myothermodel);
           Assert.IsNull(myothercolour);
       }

This is the method I am used to, which is why this list is confusing me.

Re: How do you make a unit test of an empty linked list?

Melissa Anthonia14-Dec-19 3:14

Melissa Anthonia

14-Dec-19 3:14

So far so good, but I am basically coding in blindness at this point.
I got the first test to run.

[TestMethod]
public void Index()
{
    // Arrange
    List<string> list = new List<string>();

    // Act
    bool isEmpty = (list.Count == 0);

    // Assert
    Assert.AreEqual(0, list.Count());

}

The next part of the code that I am going to test is this:

public int Length()
{
    return size;
}

Using knowledge from the last test, I am... guessing this how I am supposed to test this part, but I am not sure what to write in Assert.

public void NumberOfObjects()
{
    // Arrange
    List<int> lenght = new List<int>();

    // Act
    lenght.Count();

    // Assert

}

I have googled and searched on places like Youtube, but I have yet to find a tutorial that talks about conducting unit testing on linked lists.
If you know of any website or tutorial that explains it, then I would be very happy.

design a printdocument control with a text and boxes like filling form

bimalachira13-Dec-19 7:06

bimalachira

13-Dec-19 7:06

How to code in C# to crate a printdocumentto preview like a filling form with boxes.

Bimal

Re: design a printdocument control with a text and boxes like filling form

OriginalGriff13-Dec-19 8:03

OriginalGriff

13-Dec-19 8:03

You don't: a PrintDocument is not an interactive control, it provides no mechanism for user input.
You could conceivably add code to open a new form to fill in in the PrintDocument, but that really isn't what it's for (and the same code is called for the actual print do it's gonna get messy if you want anything to work properly).

Instead, create a form for the user to input his data, validate it, and store that - then pass it through to the PrintDocument for format for output.

"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
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c# memory crash

Member 1449096413-Dec-19 5:26

Member 14490964

13-Dec-19 5:26

I am using Mysql.data.dll in c# project.
Now I called c++ dll function. But after calling c++ dll function, my sql connection fails.

Error code is
Project.exe Error: 0 : Unable to connect to any of the specified MySQL hosts.
Exception thrown: 'MySql.Data.MySqlClient.MySqlException' in MySql.Data.dll

Help me. How can i solve this issue?