c# - 从 C# 调用 JavaScript 时出现错误 UnathorizedException

Question

我正在尝试在 PhoneGap (Cordova) Windows Phone 8 应用程序中从 C# 调用 JavaScript 代码。按照此接受的答案线程的步骤:How to call JavaScript from C# - Cordova/PhoneGap

我应该能够访问 Javascript 部分中的方法或执行硬编码的 JS 代码。但是，我遇到了这个错误:

An exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
A first chance exception of type 'System.UnauthorizedAccessException' occurred in System.Windows.ni.dll
An exception of type 'System.UnauthorizedAccessException' occurred in System.Windows.ni.dll but was not handled in user code
A first chance exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.ni.dll
An exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.ni.dll and wasn't handled before a managed/native boundary
ERROR: Exception in ProcessCommand :: Exception has been thrown by the target of an invocation.
ERROR: failed to InvokeMethodNamed :: pluginMethod on Object :: Example

我的代码是(是 native 插件):

namespace WPCordovaClassLib.Cordova.Commands
{
    public class Example : Cordova.Commands.BaseCommand
    {
        public void pluginMethod(string options)
        {
          //The error is caused in this line
          PGWebBrowserHandler.getInstance().webView.CordovaBrowser
              .InvokeScript("eval", 
                            new string[] { "alert('Is it running?!');" });
        }
    }
}

PGWebBrowserHandler 是前面提到的线程中给出的单例类的名称，以便从任何 C# 类访问 CordovaBrowser。

错误(FileNotFoundException、 UnauthorizedAccessException 和 TargetInitationException)不是由 InvokeScript() 方法引起的，之前是通过获取webView引起的，它不会崩溃，但是调试它时，很多is方法都会导致UnauthorizedAccessException。

我希望我的解释很清楚。我一直在谷歌搜索它，但我没有在任何地方找到解决方案或解决方法。 有人知道这些问题的原因吗？从 MainPage.cs 调用 invokeScript() 方法也会导致异常。

Answer 1

试试这个代码:

Dispatcher.BeginInvoke(
            () =>
            {
                PGWebBrowserHandler.getInstance().webView.CordovaBrowser
                    .InvokeScript("eval",
                      new string[] { "alert('Is it running?!');" });
            });