显示窗体窗体时，控制台应用程序不接受输入

问题描述：

我创建了一个控制台应用程序。我想让标签（在表单上）显示我在控制台中输入的任何内容，但是当我运行表单时控制台挂起。

I have created a console application. I want to make the label (on the form) display whatever I type in the console, but the console hangs when I run the form.

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace ConsoleApplication1
{
    class Program
    {
        Label a;
        static void Main(string[] args)
        {
            Form abc = new Form(); 
            Label a = new Label();
            a.Text = "nothing";
            abc.Controls.Add(a);
            Application.Run(abc);
            System.Threading.Thread t=new System.Threading.Thread(Program.lol);
            t.Start();


        }
        public static void lol()
        {
            Program p = new Program();
            string s = Console.ReadLine();
            p.a.Text = s;
            lol();
        }


    }
}

答

Application.Run 将阻塞，直到窗体关闭。所以你应该在一个单独的线程上调用。

Application.Run will block until the form has closed. So you should call that on a separate thread.

然而，你的UI将在那个单独的线程上执行 - 触摸UI线程之外的UI元素，因此在调用 Console.ReadLine（）后，您需要使用 Control

However, your UI will then be executing on that separate thread - and you mustn't "touch" a UI element from a thread other than the UI thread, so after calling Console.ReadLine(), you'll need to use Control.Invoke or Control.BeginInvoke to make changes in the UI.

此外，您还可以使用您目前正在宣布一个名为 a 的本地变量，但不要为 Program.a 。

Additionally, you're currently declaring a local variable called a, but never assigning a value to Program.a.

以下是一个完整的版本：

Here's a complete version which works:

using System;
using System.Threading;
using System.Windows.Forms;

class Program
{
    private Program()
    {
        // Actual form is created in Start...
    }

    private void StartAndLoop()
    {
        Label label = new Label { Text = "Nothing" };
        Form form = new Form { Controls = { label } };
        new Thread(() => Application.Run(form)).Start();
        // TODO: We have a race condition here, as if we
        // read a line before the form has been fully realized,
        // we could have problems...

        while (true)
        {
            string line = Console.ReadLine();
            Action updateText = () => label.Text = line;
            label.Invoke(updateText);
        }
   }

    static void Main(string[] args)
    {
        new Program().StartAndLoop();
    }
}

显示窗体窗体时，控制台应用程序不接受输入

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