使用流程处理问题错误

问题描述

你好，

我有一个执行流程(运行命令行命令)的类.接收到命令执行的输出后，我要检查各种行并引发异常.我的代码是:

Hello,

I have a class which executes a Process (runs a command line command). On receiving the output from the command execution, I want to check various lines and throw exception. My code is :

************ This is a library class
public int ConnectToServer()
{
    int error = 0;
    connected = false;
    try
    {
        process = Process.Start(processInfo);

        process.BeginOutputReadLine();
        process.OutputDataReceived += new DataReceivedEventHandler(Process_OutputDataReceived);
    }
    catch (Exception e)
    {
        Console.WriteLine("Error Processing ConnectToServer : " + e.Message);
        errorMsg = e.Message;
        error = -1;
    }

    return error;
}

private void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    string d = e.Data;
    Console.WriteLine("LINE = " + d);
    if (d != null)
    {
        if (d.IndexOf("Completed") > 0)
        {
            connected = true;
            Console.WriteLine("********* Connected = " + connected);
        }
        else if (isInValidLine(d))
            throw new Exception(d);    // HERE I get Exception not handled
    }
    return;
}

private bool isInValidLine(string line)
{
    if (line.IndexOf("Cannot load file") > 0)
        return true;
    return false;
}

我称呼它的GUI代码:
***************************

GUI CODE where I am calling it :
***************************

try
{
    StartConnect();
}
catch (Exception ex)
{
    string msg = ex.Message;
    if (msg.Equals("NotConnectedException"))
        MessageBox.Show("Error connecting  : Connection Time Out "Time Out", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);
    else if (msg.IndexOf("Cannot load file") > 0)
        MessageBox.Show("Error connecting : Problem with File \n Unable to Load or Find required file.", "Failed to Connect", MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

}

}

private void StartConnect()
{
    DateTime start = DateTime.Now;

    int timeout = 40000, timepassed = 0;

    oc = new OpenConnect(cmd, timeout);
    int retVal = oc.ConnectToServer();
    while (!oc.Connected)
    {
        timepassed = (int)(DateTime.Now - start).TotalMilliseconds;
        if (timepassed > timeout)
        {
            connectedToVpn = false;
            throw new Exception("NotConnectedException");
        }
        Thread.Sleep(100);
    }

谁能帮助我解决错误?我想要的是在Process_OutputDataReceived中引发的异常应在ConnectToServer()中处理，或在调用StartConnect()的try {}中处理.
为什么在throw @ new Exception("Cannot find file")行处出现运行时异常?

任何帮助表示赞赏.我很想通过读取命令的输出来处理很多情况.

谢谢

Can anyone help me solve the mistake? What I want is the Exception that are thrown in Process_OutputDataReceived should be handled in ConnectToServer() or handled in try{} that calls StartConnect().
Why do I get a runtime Exception at throw @ new Exception("Cannot find file") line?

Any help is appreciated. I am stuck up want to handle such many cases by reading the output of the command.

Thanks

推荐答案

//-----------------------------------------------------------------------------
private void Process_OutputDataReceived(object sender, DataReceivedEventArgs e)
{
    connected = false;
    string d = e.Data;
    if (!string.IsNullOrEmpty(d))
    {
        Console.WriteLine("LINE = " + d);
        if (d.StartsWith("Completed"))
        {
            connected = true;
            Console.WriteLine("********* Connected = " + connected);
        }
        else if (isInValidLine(d))
        {
            throw new Exception(string.Format("Invalid line: {0}", d));
        }
    }
}

//-----------------------------------------------------------------------------
private bool isInValidLine(string line)
{
    return (line.StartsWith("Cannot load file"));
}

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