C＃ - 使用非主线程更新界面 [英] C# - Updating GUI using non-main Thread

问题描述

我有一个具有类

• GUI


• 上传
$程序b $ b
• 和2类之间的缓冲器 - 即所使用的2类之间的通信。

• GUI
• Upload
• and a buffer between the 2 classes - ie used to communicate between the 2 classes .

上传类使用过程来运行一个FTP命令行应用程序。我想回到什么，在文本在GUI中显示的FTP应用程序生成的输出。结果
我已经尝试使用下面的代码有被截断。

The Upload class uses Process to run an command line FTP app. I want to return what output produced by the FTP app to be displayed in a textbox in the GUI.
I have tried using the following code that has been truncated.

上传类（beginProcess（）是用于启动线程（此处未示出）的方法）：

Upload Class (beginProcess() is a method used to start the Thread (not shown here)):

public delegate void WputOutputHandler(object sender, DataReceivedEventArgs e);
class Upload
{
    private WputOutputHandler wputOutput;

    beginProcess()
    {
        Process pr = new Process();                                                 
        pr.StartInfo.FileName = @"wput.exe";                                        
        pr.StartInfo.RedirectStandardOutput = true;
        pr.StartInfo.UseShellExecute = false;
        pr.StartInfo.WindowStyle = ProcessWindowStyle.Hidden;
        pr.OutputDataReceived += new DataReceivedEventHandler(OnDataReceived);
        pr.ErrorDataReceived += new DataReceivedEventHandler(OnDataReceived);
        pr.Start();                                                                 
        pr.BeginOutputReadLine();
        pr.WaitForExit();
    }


    public void OnDataReceived(object sender, DataReceivedEventArgs e)
    {
        if(wputOutput != null)
        {
            wputOutput(sender, e);
        }
    }


    public event WputOutputHandler WputOutput
    {
        add
        {
            wputOutput += value;
        }
        remove
        {
            wputOutput -= value;
        }
    }
}

Buffer类：

Buffer Class:

public void EventSubscriber()
{
    uploadSession.WputOutput += Main.writeToTextBoxEvent;
}

主类：

Main Class:

public void writeToTextBoxEvent(object sender, DataReceivedEventArgs e)
{
    if(this.textBox1.InvokeRequired)
    {
        MethodInvoker what now?
    }
    else
    {
        textBox1.Text = e.Data;
    }
}

正如你所看到的，当它来到主方法的writeToTextBoxEvent，我已经跑出去的想法。我不知道这样做是否使用自定义事件的UI更新，甚至做到这一点的最好办法。如果有人可以点我在正确的方向，我将不胜感激。

As you can see, when it come to the Main method's writeToTextBoxEvent, I've ran out of ideas. I'm not sure whether doing a UI update using a custom event is even the best way to do it. If someone could point me in the right direction I would be most grateful.

推荐答案

这个怎么样：

public void writeToTextBoxEvent(object sender, DataReceivedEventArgs e)
{
    if(this.textBox1.InvokeRequired)
    {
        // In .Net 2.0
        this.textBox1.BeginInvoke(new MethodInvoker(() => writeToTextBoxEvent(sender, e)));

        // In .Net 3.5 (above is also possible, but looks nicer)
        this.textBox1.BeginInvoke(new Action(() => writeToTextBoxEvent(sender, e)));
    }
    else
    {
        textBox1.Text = e.Data;
    }
}

有关对理查德的解决了这个方法的优点是你不'T需要编写代码执行两次（在的BeginInvoke（），再次在其他路径）。

The advantage for this method against Richard solution is you don't need to write the executing code twice (within the BeginInvoke() and again in the else path).

如果你对净3.5使它作为扩展方式：

If you're on .Net 3.5 make it as an extension method:

public static class ControlExtensions
{
    public static void SafeInvoke(this Control control, Action action)
    {
        if (control.InvokeRequired)
        {
            control.Invoke(action);
        }
        else
        {
            action();
        }
    }

    public static void SafeBeginInvoke(this Control control, Action action)
    {
        if (control.InvokeRequired)
        {
            control.BeginInvoke(action);
        }
        else
        {
            action();
        }
    }
}

和使用它的方法：

public void writeToTextBoxEvent(object sender, System.Diagnostics.DataReceivedEventArgs e)
{
    // Write it as a single line
    this.textBox1.SafeBeginInvoke(new Action(() => textBox1.Text = e.Data));

    this.textBox1.SafeBeginInvoke(new Action(() =>
        {
            //Write it with multiple lines
            textBox1.Text = e.Data;
        }));
}

这篇关于C＃ - 使用非主线程更新界面的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！