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Better way to handle 50 labels

22-Sep-20 6:28

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Member 1494373721-Sep-20 14:54

Member 14943737

21-Sep-20 14:54

Hi,

I am fairly new to C#.I am currently writing a windows form program with 50 labels created on the form. I would like to know if there is a better way to change the label's backcolor according to the input number by the user. I am currently using Switch to do it. It makes the coding long and hard to read.

Appreciated if someone can give me advice on this.

My labels are named from label01 ..... label50

Thanks,
John

Richard Andrew x6421-Sep-20 16:12

Richard Andrew x64

21-Sep-20 16:12

You could add all the labels to a List<> object or an array.

That way you can refer to each one by index notation:

Labels[5].BackColor = Color.Green;

The difficult we do right away...
...the impossible takes slightly longer.

OriginalGriff21-Sep-20 20:58

OriginalGriff

21-Sep-20 20:58

One way is to add the number to the Label.Tag property - every Control has one, and it's a "free object" variable that is for the designer to use as he will.
You can then access each label very easily:

Label lab = Controls.OfType<Label>().FirstOrDefault(c => Convert.ToInt32(c.Tag) == 2);
lab.Text = "Hello";

You could just use the Label.Name property, but that's messier as the VS default names do not have zero padded numbers:

Label1
Label2
...
Label10
Label11
...

So you'd need a substring and to rely on the names being in the right order on screen:

Label lab = Controls.OfType<Label>().FirstOrDefault(c => Convert.ToInt32(c.Name.Substring(5)) == 2);
lab.Text = "Hello";

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modified 22-Sep-20 6:08am.

Gerry Schmitz22-Sep-20 6:45

22-Sep-20 6:45

You've mentioned: labels, background color, an input number and a switch. If you explain how all this fits together, you'll probably get a better answer.

e.g. Are all labels colored the same based on some choice? Or does every label get their own number? etc.

Most projects fail due to inadequate specs.

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

BillWoodruff22-Sep-20 7:59

BillWoodruff

22-Sep-20 7:59

As an alternative to the excellent example posted by OriginalGriff, I'd like to demonstrate how easy it is to make a Component [^] that "bakes in" the functionality you describe; the Component is derived from Label:

... you might ask: why go to all this trouble ? D'Oh! | :doh:

I assert that mastery of using custom (inherited) WinForm Controls is a very valuable skill that can help with code encapsulation, and "separation of concerns" ...

0 as you may know: a Component is created using the Project/Add Component menu choice, and, like a UserControl, will appear in the Toolbar.

... this Component, AutoNumberedLabel ...

1 keeps a static Dictionary <int, AutoNumberedLabel> which is updated automatically each time you create an instance by drag-dropping from toolbar, or, in code.

2 provides a method that looks up the AutoNumberedLabel instance from an integer parameter..

3 provides a public read-only property that holds the AutoNumberedLabel's integer id.

4 provides a public method that sets the AutoNumberedLabel's BackColor

using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace YourNameSpace
{
    public partial class AutoNumberedLabel : Label
    {
        public AutoNumberedLabel()
        {
            InitializeComponent();
        }
        
        // this constructor is called when the control is created at run-time
        public AutoNumberedLabel(IContainer container)
        {
            container.Add(this);

            InitializeComponent();

            LabelId = lblId;

            IntToLabel.Add(lblId++, this);
        }

        static Dictionary<int, AutoNumberedLabel> IntToLabel = new Dictionary<int, AutoNumberedLabel>();

        static int lblId = 0;

        public int LabelId { get; }

        public static AutoNumberedLabel GetLabelByID(int id)
        {
            if (IntToLabel.ContainsKey(id))
            {
                return IntToLabel[id];
            }

            throw new KeyNotFoundException();
        }

        public static void SetLabelColorByID(int id, Color color)
        {
            if (IntToLabel.ContainsKey(id))
            {
               IntToLabel[id].BackColor =  color;
               return;
            }

            throw new KeyNotFoundException();
        }
    }
}

Here's how you might use this, assuming you've assigned all your AutoNumberedLabels the same Click Eventhandler:

private void autoNumberedLabel_Click(object sender, EventArgs e)
{
    AutoNumberedLabel lbl = (AutoNumberedLabel) sender;
    
    int Id = lbl.LabelId;

    // test if a round-trip works
    AutoNumberedLabel lbl2 = AutoNumberedLabel.GetLabelByID(Id);
    if(lbl2 != lbl) throw new ArgumentException();

    AutoNumberedLabel.SetLabelColorByID(Id, Color.Gold);
}

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modified 22-Sep-20 23:59pm.

Mycroft Holmes22-Sep-20 12:20

Mycroft Holmes

22-Sep-20 12:20

I always named the controls with the same number suffix therefore the label and the input control the same suffix eg cboState05 would be related to label05.

So then you have a function to extract the number from the control and concatenate the label name.

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Member 149437371-Oct-20 18:52

Member 14943737

1-Oct-20 18:52

Thanks to all. I have solved the problem, you guys have been very helpful.

Complex View Model with Nested class Properties / Array Submit

Member 1494373728-Sep-20 13:41

Member 14943737

28-Sep-20 13:41

Thanks guys for the help. I have found the solution to it.

Guillermo Perez18-Sep-20 15:50

Guillermo Perez

18-Sep-20 15:50

I'm sorry to bother you, I just have a question regarding how to validate a list of object when is inside other list... I do have a list of cities, each city has another list of zones, an example could be like this:

public class City
{
        public int Id { get; set; }        
        public string CityName { get; set; }
        public virtual List<Zone> Zones { get; set; } = new List<Zone>();
}

public class Zone
 {
        public int Id { get; set; }
        public string ZoneName { get; set; }

        public int CityId { get; set; }
        public virtual City City { get; set; }
}

Now, as you can see, the City is the principal and the Zone is the dependent class. Now I decided to pass what I have into my database to a view with a form to make changes to these Cities and their Zones, so I created a view model like this:

public class SettingsModel
    {
        public City NewCity { get; set; }
        public List<City> CurrentCities { get; set; }
    }

The first property is to create a new City that is not in the db. The other list contains the Cities already in the database. So I started by creating a list of forms using a for loop (not foreach) that uses an index. At the end, it produces something like this:

HTML

<form method="post" action="/Administration/UpdateCity">
...
<input type="hidden" id="CurrentCities_0__Id" name="CurrentCities[0].Id" value="7">
<input type="text"  id="CurrentCities_0__CityName" name="CurrentCities[0].CityName" value="Austin">
...
</form>
...
<form method="post" action="/Administration/UpdateCity">
...
<input type="hidden" id="CurrentCities_1__Id" name="CurrentCities[1].Id" value="4">
<input type="text"  id="CurrentCities_1__CityName" name="CurrentCities[1].CityName" value="Dallas">
...
</form>

as far as I understand, in the receiving action method (POST), I should use the [Bind(Prefix="CurrentCities")] to remove the unnecessary class name of the field name and, should specify a list<city> (or IEnumerable or Array) to tell that the object received is an array. in other words:

public IActionResult UpdateCity([Bind(Prefix = "CurrentCities")]List<City> myCity) 
{
...
}

My question is: When I try to add a form in the same way for the Zones property of City, I end with the form fields named as:

HTML

<input type="text" id="CurrentCities_0__Zones_0__ZoneName" name="CurrentCities[0].Zones[0].ZoneName" value="Austin Metro Area">
...
<input type="text" id="CurrentCities_1__Zones_0__ZoneName" name="CurrentCities[1].Zones[0].ZoneName" value="San Antonio Metro Area">

As you can see, now all the fields have an extra index indicator like this "CurrentCities[0].Zones[0]" and I was wondering, how can I get this object in the POST action method? how can I specify a Bind Prefix of this kind? and how could I specify that the item is a collection item of other collection item?? Please help and thank you for your patience!

Re: Complex View Model with Nested class Properties / Array Submit

Richard MacCutchan18-Sep-20 21:47

Richard MacCutchan

18-Sep-20 21:47

You posted this also in the ASP.NET forum. Please do not crosspost.

Re: Complex View Model with Nested class Properties / Array Submit

Gerry Schmitz19-Sep-20 2:43

Insert on database contents of word file using OpenXML and c#

19-Sep-20 2:43

There, you nailed it. In web interfaces, there is no (well-known) pattern that will allow you to (reasonably) add or update more than one record at a time.

It's:

Add a city
Add a zone
Add another zone
Add another city
Add a zone
Edit a city
Edit a zone.

The classic Edit and Delete action per row. 1st gen client-server.

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

cms965118-Sep-20 8:40

Re: Insert on database contents of word file using OpenXML and c#

18-Sep-20 8:40

Hello, I need your help.

I want to read a .docx file line by line and insert chapters and paragraphs of the chapter in database table.

I have tried using Microsoft.Office.Interop.Word to read the document, without success because Office may exhibit unstable behavior and/or deadlock when Office is run in this environment.

Now I read on google that the suitable tool for this is OpenXML.

My file.docx is divided for chapters and paragraphs of the chapter

The structure of file.docx

Chapter 1 - Events
-alert or disservices
-significant activities

Chapter 2 – Safety
-near miss
-security checks

Chapter 3 – Training
-environment
-upkeep

I need insert on database table according with this schema

https://i.stack.imgur.com/41YQL.png[^]

How to do resolve this?

Thanks in advance for any help or suggestion

Chevy

DROP TABLE IF EXISTS `chapters`;
CREATE TABLE `chapters` (
  `chapter` longtext CHARACTER SET utf8 COLLATE utf8_general_ci,
  `subheading` longtext CHARACTER SET utf8 COLLATE utf8_general_ci,
  `contents` longtext CHARACTER SET utf8 COLLATE utf8_general_ci,
  `sID` int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (`sID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

Gerry Schmitz18-Sep-20 9:36

Re: Insert on database contents of word file using OpenXML and c#

18-Sep-20 9:36

I don't know about "OpenXML", but if you save your docx in MS Word as a "Word XML document", you can actually "see" the xml and make sense of your document if you then open it in Xml Notepad, for example.

("OpenXml" seems to have it's own internal "non-xml" format. Bizarre).

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

cms965118-Sep-20 9:52

Re: Insert on database contents of word file using OpenXML and c#

18-Sep-20 9:52

Thanks for suggestion, do you have any example for me?
The Google search is empty...

Gerry Schmitz18-Sep-20 11:18

Re: Insert on database contents of word file using OpenXML and c#

18-Sep-20 11:18

Which part?

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

cms965118-Sep-20 20:13

Re: Insert on database contents of word file using OpenXML and c#

18-Sep-20 20:13

Don't have found anything for my case in OpenXML tutorials with Google search

Dave Kreskowiak18-Sep-20 18:45

Dave Kreskowiak

18-Sep-20 18:45

The DOCX format is really just a .ZIP file with a bunch of XML files in it.

You can just rename the .docx file to .zip and open it in any .zip tool.

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Re: Insert on database contents of word file using OpenXML and c#

cms965118-Sep-20 20:11

Re: Insert on database contents of word file using OpenXML and c#

18-Sep-20 20:11

I'm sorry, I don't understand your suggestion...

Pete O'Hanlon18-Sep-20 23:10

Pete O'Hanlon

18-Sep-20 23:10

Unzip the docx file and take a look at the xml files inside.

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Re: Insert on database contents of word file using OpenXML and c#

Gerry Schmitz19-Sep-20 2:17

The forms are cut for me using high resolution on WinForm

19-Sep-20 2:17

Thanks ... They should have called it .docxzip then.

Or .odoc.

Or anything except .docx.

I know what a .jar file is ... I guess they could have called it .javax, but didn't.

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

goldsoft18-Sep-20 1:51

goldsoft

18-Sep-20 1:51

I got a new laptop with very high resolution. I increased the size text, apps and other to 150%

i work on WinForm program using Visual-Studio 2019.

All the forms in my program are cut and everything goes wrong on the screen.

i try this:

app.manifest

<compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
<application>

<supportedos id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}">

app.config

<system.windows.forms.applicationconfigurationsection>
<add key="DpiAwareness" value="PerMonitorV2">
<add key="EnableWindowsFormsHighDpiAutoResizing" value="false">

i work on .NET Framework 4.7.2

i also try this:

https://docs.microsoft.com/en-us/dotnet/desktop/winforms/high-dpi-support-in-windows-forms?view=netframeworkdesktop-4.8

and also this on the main of every form: (Each time something different)

this.AutoScaleMode = AutoScaleMode.Font;
this.AutoScaleMode = AutoScaleMode.Dpi;
this.AutoScaleMode = AutoScaleMode.None;
I have already tried everything .... and nothing helps. any idea ?

thanks

Re: The forms are cut for me using high resolution on WinForm

Gerry Schmitz18-Sep-20 7:39