WebView2 throw COMException (0x800401F0): CoInitialize has not been called. (0x800401F0 (CO_E_NOTINITIALIZED))

[SkyIsWhite]

Description
1 Call CoreWebView2Environment.CreateAsync throw exception
2 this call was in main thread
3 has no another one

Stack
,CoreWebView2InitializationCompleted,InitializationException=System.Runtime.InteropServices.COMException (0x800401F0): CoInitialize has not been called. (0x800401F0 (CO_E_NOTINITIALIZED))
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHR(Int32 errorCode)
at Microsoft.Web.WebView2.Core.CoreWebView2Environment.CreateAsync(String browserExecutableFolder, String userDataFolder, CoreWebView2EnvironmentOptions options)
at Microsoft.Web.WebView2.Wpf.WebView2.<>cDisplayClass26_0.<gInit|0>d.MoveNext(),Return

Version
SDK: 1.0.902.49
Runtime: edg/92.0.902.67
Framework: wpf

code
webView = new Microsoft.Web.WebView2.Wpf.WebView2();
webView.BeginInit();
webView.CoreWebView2InitializationCompleted += WebView_CoreWebView2InitializationCompleted;
webView.CreationProperties = new CoreWebView2CreationProperties();
webView.CreationProperties.UserDataFolder = UserDataPath;
this.grid.Children.add(webView);
webView.EndInit();
await webView.EnsureCoreWebView2Async();

[champnic]

Hey @SkyIsWhite - Can you share a sample app that reproduces this issue?

[SkyIsWhite]

webView = new Microsoft.Web.WebView2.Wpf.WebView2();
webView.BeginInit();
webView.CoreWebView2InitializationCompleted += WebView_CoreWebView2InitializationCompleted;
var options = new CoreWebView2EnvironmentOptions("--autoplay-policy=no-user-gesture-required");
var environment = await CoreWebView2Environment.CreateAsync(null, UserDataPath, options);
this.grid.Children.Add(webView);
webView.EndInit();
await webView.EnsureCoreWebView2Async(environment);
@champnic

[champnic]

Hey @SkyIsWhite - It's hard to know exactly what's wrong with the code you posted. The WebView2 needs to be created, run, and accessed on a Single Threaded Apartment (STA) COM thread - https://docs.microsoft.com/en-us/microsoft-edge/webview2/concepts/threading-model

Typically this is done for you by WPF or Winforms. From the looks of your code and not using .xaml, I'm assuming you are creating the WebView2 off of the WPF UI thread. Is there a reason you are avoiding using XAML? Can you try creating the WebView2 on the UI thread?