The way you create your .NET Core WinForms application is very similar to creating .NET Framework application:
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In the Open recent/Get started Dialog of Visual Studio 2019, click on Create a new project.
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Visual Studio shows the Create a new project dialog. In the project filter textbox, enter “winforms” to filter all the templates to WinForms projects, and pick Windows Forms App (.NET Core) for C#.
Note: The Visual Basic language is currently not supported for .NET Core WinForms applications.
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In the Dialog Configure your new project, enter a Project name, for example “HelloWinFormsCore”. Chose a file Location for the project files and click Create to create the Visual Studio Solution with the WinForms Core Project.
Note: After you’ve created a new WinForms project, it might take Visual Studio a few seconds to properly load all files before you can open the designer by double-clicking on the Form1.cs.
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For the first “Hello world” we’re going to add two controls from the Toolbox to the Form:
A Button and a Label.Please note that there are issues with Preview 1, and we appreciate all reports of bugs and odd behaviors that you might find, and most of all any additional feedback concerning performance, crashes or ideas you can provide. For example, Preview 1 does not support any container controls. Also, Resource Files are not supported at this point, which means you will not be able to set background images for certain controls or assign images to PictureBox controls. The component tray is also not enabled in the current preview. That's why it is important that you explore the tasks you want to do with the designer in as many different ways as possible and try them out to make sure that the designer will work the way you expect in all the different scenarios in the future. Should the Designer not work as you expect it, and what you discovered is not in the list of Known Issues (see KnownIssues.md) – providing VS feedback is the most helpful cause of action!
So, to insert the first control – the Label – just double-click on the Label in the toolbox to insert it onto the design surface.
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Now, grab the Label control, and drag it somewhat centered in the upper third of the Form.
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Find the AutoSize property in the properties window and double-click to disable it.
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Find the Text property in the properties window, open its context menu, and click Reset to clear the text field.
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Resize the control, so it becomes double its original size, and place it somewhat in the middle of the Form.
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Find the TextAlign property and set it to MiddleCenter.
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Find the Anchor property and set it to None.
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Find the Font property in the properties window and set it to 12pt Semibold or Bold.
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Finally, find the Name property, and name the Label “helloWorldLabel”.
Now, let’s add a Button to the Form, but let’s do it in another way.
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Click the Button in the toolbox to select it.
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“Draw” the Button with the mouse on the Form.
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Drag the Button and place it beneath the Label.
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Find the Name property and name the Button “helloWorldButton”.
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Find the Text property and set the text to “Greet the world!”.
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Set the Anchor property of the Button to None.
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Switch to the Event tab in the property browser.
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Double-click the Click event in the event list to switch to the code editor, so you can add the code line, which assigns the string “Hello World!” to the Label control:
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Start the app by clicking Debug from the pulldown menu, click on Start Debugging (or alternatively press F5) and check, if your first designed WinForms Core App acts as expected.
IMPORTANT: Close the open Form in the Designer before you close the project or quit Visual Studio.