C# - 无法处理 enter 和 tab 键事件 [英] C# - unable to process enter and tab key event

问题描述

我是新的 c#，我正在使用以下代码，但该代码不适用于 Enter 键和 Tab 键.请解决这个问题...

I am new c#, I am using below code, but the code is not working for Enter key and the Tab key. Please Solve this problem…

private void Panel_Load(object sender, EventArgs e)
{
    this.KeyDown += new KeyEventHandler(C_event);
}

private void C_event(object sender, KeyEventArgs e)
{
    if (e.KeyCode == Keys.Enter)
    {
        Label1.Text = "Enter Key";
        return;
    }
    if (e.keyCode == Keys.Tab)
    {
        Label1.text = "Tab Key";
        return;
    }

    label1.text = "Default";
}

推荐答案

为了能够处理 Enter/Tab 键按下，您应该重写 ProcessCmdKey 方法

To be able to handle Enter/Tab key presses you should override the ProcessCmdKey method

 protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        if (!this.ProcessKey(msg, keyData))
        {
            return base.ProcessCmdKey(ref msg, keyData);
        }
        return false;
    }

    protected virtual bool ProcessKey(Message msg,Keys keyData)
    {
        //The condition needs to be either `if ((keyData & Keys.Enter) == keyData)` or `if (keyData == Keys.Enter)`.
        if ((keyData & Keys.Enter) == Keys.Enter)
        {
            Label1.Text = "Enter Key";
            return true;
        }
        if ((keyData & Keys.Tab) == Keys.Tab)
        {
            Label1.Text = "Tab Key";
            return true;
        }
        return false;
    }

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