Visual studio 2019 windows forms designer

Question

I'm having a problem with the windows form application . When I create the windows form application , it displays the source code for the form but not the designer layout

Be sure to pick the correct project template. VS2019 version 16.3.x will let you create a .NETCore project that targets Winforms, the designer however is not done yet. You need to select .NETFramework — Hans Passant, Oct 14 '19 at 17:13
If you selected .NET Framework, you can try to open the designer using hotkey "Shift+ F7" — 大陸北方網友, Oct 15 '19 at 02:04
My suspicion is that you created a new WinForms project targeting .NET 3.0, which as Hans mentioned, requires a different winforms designer (still in preview), but can be downloaded from https://aka.ms/winforms-designer. You can read more about it here: https://devblogs.microsoft.com/visualstudio/dot-net-core-support-in-visual-studio-2019-version-16-3/ Alternatively, create your winforms project targeting the full .NET Framework instead of .NET Core 3.0. — Ed Dore, Oct 15 '19 at 17:59
@KyleWang, thankyou.. I tried to reset to default settings and also tried shift+f7, but nothing worked . So I moved to visual studio community 2017 — HRC, Oct 16 '19 at 13:31
@EdDore's comment solved my issue. You should create a `Windows Form App (.NET Framework)` instead of a `Windows Form App (.NET Core)` — JVE999, Oct 28 '19 at 18:57

score 14 · Accepted Answer · answered Nov 13 '19 at 16:33

14

To enable the designer, download and install the Windows Forms .NET Core Designer VSIX package.

See article: https://devblogs.microsoft.com/dotnet/introducing-net-core-windows-forms-designer-preview-1/

answered Nov 13 '19 at 16:33

Danielle

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So at this point it seems you need to have the VS 2019 Preview 16.5. If you have the latest non-Preview (16.4.2 as of today), they say it won't work. – Andrew Dec 20 '19 at 17:25

score 2 · Answer 2 · edited Aug 24 '20 at 22:08

2

I had the same problem. The following steps helped me

Remove any other classes than the Form class in the yourformname.cs file
Unload the project and right click on the project and choose edit project
Make sure yourformname form has the SubType set to form <SubType>Form</SubType> and save the file
Reload the project

edited Aug 24 '20 at 22:08

Jeff B

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answered Mar 15 '20 at 20:09

Andreas

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@JohnnyWu Something like this: https://stackoverflow.com/a/22600109/945456 – Jeff B Aug 24 '20 at 22:08

score 2 · Answer 3 · answered Sep 04 '20 at 11:20

2

As of version 16.8.0 Preview 2.1 I have found that I have to turn off this setting and restart and add my form. Once added, I can turn it back on, restart and work.

answered Sep 04 '20 at 11:20

ΩmegaMan

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score 0 · Answer 4 · answered Jul 14 '20 at 02:58

0

This happened to me as well.

I was using the wrong template (.net core when I wanted to use the full .net framework which allows you to edit the form as you were used to in vs 2017 or previous versions).

answered Jul 14 '20 at 02:58

newbie

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score 0 · Answer 5 · answered Jul 20 '20 at 13:26

0

I am using 16.6.5 and it appears after you first created the project, you have to run the project in order for IDE to pickup the form.cs.

answered Jul 20 '20 at 13:26

Johnny Wu

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score 0 · Answer 6 · answered Dec 01 '21 at 11:50

Certainly in WinForms one thing to check is you haven't declared any other classes in the form class file before the form itself. The example below will prevent the designer loading the form or even giving you the menu option to 'View Designer'

// Don't do declare a class here
public class MyNewClass
{
}

public partial class MyForm: Form
{
    public MyForm()
    {
        InitializeComponent();
     }
}

score 0 · Answer 7 · answered Jul 05 '22 at 04:56

Removing inner class makes my form back to Visual Studio Design display.

For example, this Form2 will be regarded as normal class if you uncomment its inner class.

namespace XXX {
    //public class EventMsgXXX:EventArgs {
    //   public string mmm {get; private set;}

    //   public EventMsgXXX(string str) {
    //      mmm = str;
    //   }
    //}

    public partial class Form2:Form {
        public event EventHandler<EventMsgXXX> OnCallback;

        public Form2() {
            InitializeComponent();
        }

        private void btn_Click(object sender,EventArgs e) {
            EventHandler<EventMsgXXX> handler = OnCallback;
            if (handler != null) {
                EventMsgXXX arg = new EventMsgXXX("HELLO");
                handler(this, arg);     
            }
        }
    }
}

score -1 · Answer 8 · edited Jun 20 '20 at 09:12

-1

I have tried the suggestion by Danielle, but it appears to be a circular reference to other articles Olia. A plethora of comments also say that what Olia is suggesting, does not work, and at the end, you need to do the following.

Solution

Download Visual Studio 16.6.0 Preview 2.1 from here. This works.

edited Jun 20 '20 at 09:12

Community

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answered Apr 04 '20 at 17:00

Farhan

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Visual studio 2019 windows forms designer

8 Answers8

Solution

Linked

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