Question

如果用户点击回车键，我想显示一条消息，说明输入键已被点击。否则，我想正常输入文本框。

private void enterCheck(object sender, KeyEventArgs e)  
    {
        if (e.KeyCode == Keys.Enter)    
        {
               MessageBox.Show("Enter Was Clicked");
        }
    }

如果按下Enter键，则会正确显示消息。但是，如果我尝试输入一个句子，文本框中就不会出现任何内容。

这会有用......

private void enterCheck(object sender, KeyEventArgs e)  
    {
        if (e.KeyCode == Keys.Enter)    
        {
               MessageBox.Show("Enter Was Clicked");
        }   
        else
        {
               MessageBox.Show(e.KeyCode.ToString());
        }
    }

但是，我不想要一个显示每个输入字母的信息框。

Answer 1

试试这个：

private void enterCheck(object sender, KeyEventArgs e)  
{
    if (e.KeyCode == Keys.Enter)
    {
        MessageBox.Show(e.KeyCode.ToString());
    }
    else
    {
        e.Handled = true;
    }
}

请工作！这是我遇到的最令人困惑的事情！

Answer 2

使用KeyPress事件：

// This event occurs after the KeyDown event and can be used to prevent
// characters from entering the control.
private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e)
{
    // Check for the flag being set in the KeyDown event.
    if (e.KeyChar == (char)Keys.Return)
    {
        // Stop the character from being entered into the control since it is non-numerical.
        MessageBox.Show("Enter Was Pressed");
        e.Handled = true;
    }
}

如果按Enter键 - 显示消息。否则 - 正常输入

2 个答案: