通过C#更新UI线程(文本框)

商业智能人员在这里有足够的C#在我的腰带下是危险的.

我已经构建了一个自制的winforms应用程序,它基本上在循环中执行命令行工具来"执行东西".所述东西可以在几秒或几分钟内完成.通常,我需要为位于DataTable中的每一行执行一次该工具.

我需要重定向命令行工具的输出并将其显示在"我的"应用程序中.我试图通过文本框这样做.我正在遇到有关更新UI线程的问题,而我自己无法理解这些问题.

为了执行我的命令行工具,我从这里借用了代码:如何解析c#的命令行输出？

这是我的等价物:

        private void btnImport_Click(object sender, EventArgs e)
        {
           txtOutput.Clear();
            ImportWorkbooks(dtable);

        }


        public void ImportWorkbooks(DataTable dt)
        {

            ProcessStartInfo cmdStartInfo = new ProcessStartInfo();
            cmdStartInfo.FileName = @"C:\Windows\System32\cmd.exe";
            cmdStartInfo.RedirectStandardOutput = true;
            cmdStartInfo.RedirectStandardError = true;
            cmdStartInfo.RedirectStandardInput = true;
            cmdStartInfo.UseShellExecute = false;
            cmdStartInfo.CreateNoWindow = false;

            Process cmdProcess = new Process();
            cmdProcess.StartInfo = cmdStartInfo;
            cmdProcess.ErrorDataReceived += cmd_Error;
            cmdProcess.OutputDataReceived += cmd_DataReceived;
            cmdProcess.EnableRaisingEvents = true;
            cmdProcess.Start();
            cmdProcess.BeginOutputReadLine();
            cmdProcess.BeginErrorReadLine();

            //Login
            cmdProcess.StandardInput.WriteLine(BuildLoginString(txtTabCmd.Text, txtImportUserName.Text, txtImportPassword.Text, txtImportToServer.Text)); 


            foreach (DataRow dr in dt.Rows)
            {
                   cmdProcess.StandardInput.WriteLine(CreateServerProjectsString(dr["Project"].ToString(), txtTabCmd.Text));

                //Import Workbook

                cmdProcess.StandardInput.WriteLine(BuildPublishString(txtTabCmd.Text, dr["Name"].ToString(), dr["UID"].ToString(),dr["Password"].ToString(), dr["Project"].ToString()));
            }
            cmdProcess.StandardInput.WriteLine("exit");   //Execute exit.
            cmdProcess.EnableRaisingEvents = false;
            cmdProcess.WaitForExit();
        }


private void cmd_DataReceived(object sender, DataReceivedEventArgs e)
        {
            //MessageBox.Show("Output from other process");
            try
            {
        // I want to update my textbox here, and then position the cursor 
        // at the bottom ala:

                StringBuilder sb = new StringBuilder(txtOutput.Text);
                sb.AppendLine(e.Data.ToString());
                txtOutput.Text = sb.ToString();
                this.txtOutput.SelectionStart = txtOutput.Text.Length;
                this.txtOutput.ScrollToCaret();


            }
            catch (Exception ex)
            {
                 Console.WriteLine("{0} Exception caught.", ex);

            }

        }

当我在cmd_DataReceived()中实例化我的StringBuilder时,引用txtOuput.text整齐地导致应用程序挂起:我猜是某种跨线程问题.

如果我在StringBuilder中删除对txtOuput.text的引用并继续调试,我在这里得到一个跨线程违例:

txtOutput.Text = sb.ToString();

Cross-thread operation not valid: Control 'txtOutput' accessed from a thread other than the thread it was created on.

好的,不要惊讶.我假设cmd_DataReceived正在另一个线程上运行,因为我在执行Process.Start()之后执行操作的结果...并且如果我在cmd_DataReceived()中删除对txtOuput.Text的所有引用并且只是转储命令行文本通过Console.Write()输出到控制台,一切正常.

所以,接下来我将尝试使用http://msdn.microsoft.com/en-us/library/ms171728.aspx中的信息在UI线程上更新我的TextBox的标准技术

我向我的班级添加了一个委托和线程:

delegate void SetTextCallback(string text);
// This thread is used to demonstrate both thread-safe and
// unsafe ways to call a Windows Forms control.
private Thread demoThread = null;

我添加了一个更新文本框的过程:

 private void SetText(string text)
    {
        // InvokeRequired required compares the thread ID of the
        // calling thread to the thread ID of the creating thread.
        // If these threads are different, it returns true.
        if (this.txtOutput.InvokeRequired)
        {
            SetTextCallback d = new SetTextCallback(SetText);
            this.Invoke(d, new object[] { text });
        }
        else
        {
            this.txtOutput.Text = text;
        }
    }

我添加另一个调用线程安全的proc:

 private void ThreadProcSafe()
    {
       // this.SetText(sb3.ToString());
        this.SetText("foo");

    }

...最后我把这个混乱称为cmd_DataReceived,如下所示:

private void cmd_DataReceived(object sender, DataReceivedEventArgs e)
{
    //MessageBox.Show("Output from other process");
    try
    {

        sb3.AppendLine(e.Data.ToString());

        //this.backgroundWorker2.RunWorkerAsync();
        this.demoThread = new Thread(new ThreadStart(this.ThreadProcSafe));
        this.demoThread.Start();
        Console.WriteLine(e.Data.ToString());

    }
    catch (Exception ex)
    {
         Console.WriteLine("{0} Exception caught.", ex);


    }

}

...当我运行这个文本时,文本框就像死角一样死了,没有得到更新.我的控制台窗口继续更新.正如你所看到的,我尝试通过让文本框显示"foo"与工具的实际输出来简化一些事情 - 但没有快乐.我的UI已经死了.

什么给出了什么？无法弄清楚我做错了什么.我完全不喜欢在文本框中显示结果,顺便说一句 - 我只需要能够看到应用程序内部的内容,我不想弹出另一个窗口来执行此操作.

非常感谢.