Csharp 当用户右键单击文本框并单击粘贴时触发什么事件

正如JIMI提到的，您可以使用简单的定制将PasteDetected事件添加到TextBox，并(如果您 Select )拦截它以防止粘贴发生.

class TextBoxEx : TextBox
{
    const int WM_PASTE = 0x0302;
    protected override void WndProc(ref Message m)
    {
        switch (m.Msg)
        {
            case WM_PASTE:
                var e = new PasteDetectedEventArgs();
                PasteDetected?.Invoke(this, e);
                if (e.Cancel)
                {
                    m.Result = (IntPtr)1;
                    return;
                }
                break;
            default:
                break;
        }
        base.WndProc(ref m);
    }
    public event EventHandler<PasteDetectedEventArgs> PasteDetected;
}

public class PasteDetectedEventArgs : EventArgs
{
    public bool Cancel { get; set; }
}

一旦检测到，你只需判断Clipboard看看内容是什么(如果这是你关心的事情).

public MainForm()
{
    InitializeComponent();

    textBox.PasteDetected += (sender, e) =>
    {
        e.Cancel = true;    // Disallow the paste.

        // Putting the cancel option in the event argument carries a risk, so
        // do 'not' do anything in this handler that would block WndProc!!!
        BeginInvoke(()=>MessageBox.Show(Clipboard.GetText(), "Paste Detected"));
    };

This WORKS for context menu paste.个