[ACCEPTED]-EnsureCoreWebView2Async not ready even after CoreWebView2InitializationCompleted event-webview2

Accepted answer

Score: 10

You need to use await InitializeAsync(); which means async void InitializeAsync should be 3 async Task InitializeAsync. Since async can't be used with a constructor, you'll 2 have to call InitializeAsync from Form1_Load.

Try the 1 following:

using System.Diagnostics;

Option 1:

public Form1()
{
    InitializeComponent();
}

private async void Form1_Load(object sender, EventArgs e)
{
    webView2.CoreWebView2InitializationCompleted += WebView_CoreWebView2InitializationCompleted;

    Debug.WriteLine("before InitializeAsync");
    await InitializeAsync();
    Debug.WriteLine("after InitializeAsync");

    //webView2.CoreWebView2.Navigate("https://www.microsoft.com");
    //Debug.WriteLine("after Navigate");

    if ((webView2 == null) || (webView2.CoreWebView2 == null))
    {
        Debug.WriteLine("not ready");
    }

    webView2.NavigateToString(System.IO.File.ReadAllText("index.html"));

    Debug.WriteLine("after NavigateToString");
}

private async Task InitializeAsync()
{
    Debug.WriteLine("InitializeAsync");
    await webView2.EnsureCoreWebView2Async(null);
    Debug.WriteLine("WebView2 Runtime version: " + webView2.CoreWebView2.Environment.BrowserVersionString);
}


private void WebView_CoreWebView2InitializationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2InitializationCompletedEventArgs e)
{
    Debug.WriteLine("WebView_CoreWebView2InitializationCompleted");
}

Output:

before InitializeAsync
InitializeAsync
WebView_CoreWebView2InitializationCompleted
WebView2 Runtime version: 89.0.774.48
after InitializeAsync
after NavigateToString

Update - here's another option

Option 2:

public Form1()
{
    InitializeComponent();
}

private async void Form1_Load(object sender, EventArgs e)
{
    webView2.CoreWebView2InitializationCompleted += WebView_CoreWebView2InitializationCompleted;

    Debug.WriteLine("before InitializeAsync");
    await InitializeAsync();
    Debug.WriteLine("after InitializeAsync");

}

private async Task InitializeAsync()
{
    Debug.WriteLine("InitializeAsync");
    await webView2.EnsureCoreWebView2Async(null);
    Debug.WriteLine("WebView2 Runtime version: " + webView2.CoreWebView2.Environment.BrowserVersionString);

    //webView2.CoreWebView2.Navigate("https://www.microsoft.com");
    //Debug.WriteLine("after Navigate");

    if ((webView2 == null) || (webView2.CoreWebView2 == null))
    {
        Debug.WriteLine("not ready");
    }

    webView2.NavigateToString(System.IO.File.ReadAllText("index.html"));

    Debug.WriteLine("after NavigateToString");
}


private void WebView_CoreWebView2InitializationCompleted(object sender, Microsoft.Web.WebView2.Core.CoreWebView2InitializationCompletedEventArgs e)
{
    Debug.WriteLine("WebView_CoreWebView2InitializationCompleted");
}

Output:

before InitializeAsync
InitializeAsync
WebView_CoreWebView2InitializationCompleted
WebView2 Runtime version: 89.0.774.48
after NavigateToString
after InitializeAsync

Source: stackoverflow.com

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