private void CoreWebView2_WebResourceRequested(object sender, CoreWebView2WebResourceRequestedEventArgs e)
{
var responseStream = File.OpenRead(@"c:\\test.png");
var responseContentType = "image/png";
var eventType = e.GetType();
var field = eventType.GetField("_nativeCoreWebView2WebResourceRequestedEventArgs", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
var nativeArgs = field.GetValue(e);
field = _webView2Environment.GetType().GetField("_nativeCoreWebView2Environment", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
var nativeEnvironment = field.GetValue(_webView2Environment);
var managedStream = Activator.CreateInstance(eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.ManagedIStream"),
System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance,
null,
new object[] { responseStream },
null);
var createWebSourceResponseMethod = eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Environment").GetMethod("CreateWebResourceResponse", new Type[] { Type.GetType("System.Runtime.InteropServices.ComTypes.IStream"), typeof(int), typeof(string), typeof(string) });
var response = createWebSourceResponseMethod.Invoke(nativeEnvironment, new object[] { managedStream, 200, "OK", $"Content-Type: {responseContentType}" });
var responseProperty = eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.Raw.ICoreWebView2WebResourceRequestedEventArgs").GetProperty("Response");
responseProperty.SetValue(nativeArgs, response);
}
private void HandleWebResourceRequested(object sender, CoreWebView2WebResourceRequestedEventArgs args)
{
// TODO: we have to resort to reflection here because of two issues:
//
// 1) The Uri for the framework resource has a custom scheme and HttpRequestMessage does not respond
// non http schemes:
// https://github.com/dotnet/runtime/blob/0c7e9c19cb22420248c53eec6bb885fb563c700d/src/libraries/System.Net.Http/src/System/Net/Http/HttpRequestMessage.cs#L89-L92
// https://github.com/dotnet/runtime/blob/0c7e9c19cb22420248c53eec6bb885fb563c700d/src/libraries/System.Net.Http/src/System/Net/Http/HttpRequestMessage.cs#L188-L191
// So we have to take the Uri string from the native ICoreWebView2WebResourceRequest and create an
// Uri from it ourselves.
// This issue is tracked here: https://github.com/MicrosoftEdge/WebViewFeedback/issues/325
// 2) There is a null reference exception that occurs in WebView2 when trying to set the response on the event
// argument.
// This issue is tracked here: https://github.com/MicrosoftEdge/WebViewFeedback/issues/219
var eventType = args.GetType();
var field = eventType.GetField("_nativeCoreWebView2WebResourceRequestedEventArgs", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
var nativeArgs = field.GetValue(args);
var requestProperty = eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.Raw.ICoreWebView2WebResourceRequestedEventArgs").GetProperty("Request");
var nativeRequest = requestProperty.GetValue(nativeArgs);
var uriProperty = eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.Raw.ICoreWebView2WebResourceRequest").GetProperty("Uri");
var uriString = (string)uriProperty.GetValue(nativeRequest);
var uri = new Uri(uriString);
if (Element.SchemeHandlers.TryGetValue(uri.Scheme, out var handler))
{
var responseStream = handler(uriString, out var responseContentType);
if (responseStream != null) // If null, the handler doesn't want to handle it
{
responseStream.Position = 0;
field = _coreWebView2Environment.GetType().GetField("_nativeCoreWebView2Environment", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
var nativeEnvironment = field.GetValue(_coreWebView2Environment);
var managedStream = Activator.CreateInstance(eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.ManagedIStream"),
System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance,
null,
new object[] { responseStream },
null);
var createWebSourceResponseMethod = eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.Raw.ICoreWebView2Environment").GetMethod("CreateWebResourceResponse", new Type[] { Type.GetType("System.Runtime.InteropServices.ComTypes.IStream"), typeof(int), typeof(string), typeof(string) });
var response = createWebSourceResponseMethod.Invoke(nativeEnvironment, new object[] { managedStream, 200, "OK", $"Content-Type: {responseContentType}" });
var responseProperty = eventType.Assembly.GetType("Microsoft.Web.WebView2.Core.Raw.ICoreWebView2WebResourceRequestedEventArgs").GetProperty("Response");
responseProperty.SetValue(nativeArgs, response);
}
}
}