WebView2 WinForms c# "3. Getting Started" Errors ?

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VernonMarsden-2934 asked Oct 14, '20 IlijaDimitrov-8862 answered Jan 7, '21

WebView2 WinForms c# "3. Getting Started" Errors ?

Hello;

I am at 'Step 3 - Create a single WebView'

https://docs.microsoft.com/en-us/microsoft-edge/webview2/gettingstarted/winforms

But when I compile program I get the following error;

 System.NullReferenceException
 HResult=0x80004003
 Message=Object reference not set to an instance of an object.
 Source=Microsoft.Web.WebView2.WinForms
 StackTrace:
 at Microsoft.Web.WebView2.WinForms.WebView2.OnVisibleChanged(EventArgs e)
 at System.Windows.Forms.Control.AssignParent(Control value)
 at System.Windows.Forms.Control.ControlCollection.Add(Control value)
 at System.Windows.Forms.Form.ControlCollection.Add(Control value)
 at WinFormsGettngStarted.Form1.InitializeComponent() in C:\Users\vmars\source\repos\WinFormsGettngStarted\Form1.Designer.cs:line 50
    
    
 From this line:  this.Controls.Add(this.webView);

How can I get past this error ?

Thanks for yur Help...

windows-forms

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Answer 1 · 2020-10-14T06:48:31.057Z

TianyuSun-MSFT answered Oct 14, '20

Hello Vernon,

Thank you for taking time to post this issue in Microsoft Q&A forum.

This issue is caused by not choosing appropriate Platform target, please go to the properties page of your Winform project (right-click > Properties), then click Build > Platform target and choose x64 then press F5 to test again.

Sincerely,
Tianyu

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Answer 2 · 2020-10-14T14:38:16.067Z

VernonMarsden-2934 answered Oct 14, '20

Thank you TianyuSun !

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Answer 3 · 2021-01-07T05:14:52.353Z

IlijaDimitrov-8862 answered Jan 7, '21

On My app this doesn't work.

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