C#等待用户在文本框中完成键入

using System;
using System.Windows.Forms;

public class MainForm : Form
{
    private TextBox textBox;
    private Button button;

    public MainForm()
    {
        textBox = new TextBox();
        textBox.TextChanged += TextBox_TextChanged;

        button = new Button();
        button.Text = "Submit";
        button.Click += Button_Click;

        this.Controls.Add(textBox);
        this.Controls.Add(button);
    }

    private async void TextBox_TextChanged(object sender, EventArgs e)
    {
        // 模拟异步等待用户完成输入
        await Task.Delay(500); // 延迟500毫秒
    }

    private void Button_Click(object sender, EventArgs e)
    {
        string input = textBox.Text;
        MessageBox.Show("You entered: " + input);
    }

    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new MainForm());
    }
}