Dispatcher.beginInvoke不立即执行

下面是到目前为止我的代码，我有一个问题，当我打电话Dispatcher.BeginInvoke，它并没有在正确的时间Dispatcher.beginInvoke不立即执行

类脚本处理这些消息：

public void Execute() 
    { 
     var process = new Process(); 
     var startinfo = new ProcessStartInfo("cmd.exe", @"/C c:\test\my.bat"); 

     startinfo.WorkingDirectory = "c:\\test"; 
     startinfo.RedirectStandardOutput = true; 
     startinfo.RedirectStandardError = true; 

     startinfo.UseShellExecute = false; 
     startinfo.CreateNoWindow = true; 
     process.EnableRaisingEvents = true;  

     process.StartInfo = startinfo; 
     process.OutputDataReceived += (sender, args) => OutputDataReceived(args.Data); 
     process.ErrorDataReceived += (sender, args) => ErrorDataReceived(args.Data); 
     process.Exited += Exited; 
     process.Start(); 

     process.BeginOutputReadLine(); 
     process.BeginErrorReadLine(); 
     process.WaitForExit(); 

     int exitCode = process.ExitCode; 


     } 


    public void OutputDataReceived(string data) 
    { 
     Logging.Logger.Log("data received in script - " + data); 
     // throw event if we have a subscriber, else just return 
     if (OnScriptOutPut == null) return; 

     allFormattedOutPut += Environment.NewLine; 
     allFormattedOutPut += data; 
     allRawOutPut += data; 

     ScriptOutputEventArgs args = new ScriptOutputEventArgs(data); 
     OnScriptOutPut(this, args); 
    }

WPF窗口调用脚本类和订阅OnScriptOutPut事件

问题是下面，updateOutPutTextBox仅被调用脚本执行完毕后，再全部updateoutputtextbox消息处理一次全部，他们没有得到亲当begininvoke被调用导致屏幕在最后得到更新而不是新的输出数据被接收时收到。任何帮助表示赞赏！

private void btnRunScript_Click(object sender, RoutedEventArgs e) 
    { 
     Script script = new Script(); 
     script.OnScriptOutPut += script_OnScriptOutPut; 

     script.Execute(); 

    } 

    private void script_OnScriptOutPut(object sender, ScriptOutputEventArgs args) 
    { 
     Application.Current.Dispatcher.BeginInvoke(new Action(() => UpdateOutPutTextBox(args.Data)),System.Windows.Threading.DispatcherPriority.Send); 

     Logging.Logger.Log("data received in event "); 
    } 

    private void UpdateOutPutTextBox(string data) 
    { 
     Logging.Logger.Log("data received in update "+data); 
     tbOutput.Text += Environment.NewLine; 
     tbOutput.Text += data; 
    }

来源

2013-07-18 Jason Smith

它被称为'BeginInvoke'，你期望什么？为什么不使用'Invoke'？ –