/// <summary>
/// Post the specified webMessage to the top level document in this
/// IWebView2WebView. The top level document's window.chrome.webview's message
/// event fires. JavaScript in that document may subscribe and unsubscribe to
/// the event via the following:
/// ```
/// window.chrome.webview.addEventListener('message', handler)
/// window.chrome.webview.removeEventListener('message', handler)
/// ```
/// The event args is an instance of `MessageEvent`.
/// The IWebView2Settings::IsWebMessageEnabled setting must be true or this method
/// will fail with E_INVALIDARG.
/// The event arg's data property is the webMessage string parameter parsed
/// as a JSON string into a JavaScript object.
/// The event arg's source property is a reference to the
/// `window.chrome.webview` object.
/// See SetWebMessageReceivedEventHandler for information on sending messages
/// from the HTML document in the webview to the host.
/// This message is sent asynchronously. If a navigation occurs before the
/// message is posted to the page, then the message will not be sent.
/// </summary>
/// <param name="json"></param>
public void PostWebMessageAsJson(string json)
{
if (_webView2WebView != null)
{
_webView2WebView.PostWebMessageAsJson(json);
}
}