文本框上的按键事件

Keypress event on the textbox

private void txtSimnr_KeyPress(object sender, KeyPressEventArgs e)
        {
       if (!char.IsControl(e.KeyChar)
       && !char.IsDigit(e.KeyChar)
       && e.KeyChar != '.')
            {
                e.Handled = true;
            }

        }

以下是一些替代方案

1.使用MaskedTextBox(这是最简单的方法)，在此处说明
http://msdn.microsoft.com/en-us/library/system. windows.forms.maskedtextbox.aspx [ ^ ]
2.在KeyPress事件中，如果按下的键不是必需的字符，则设置e.Handled = true
3.在KeyDown事件中，如果按下的键不是必需的字符，则设置
e.SuppressKeyPress = true

The following are some of the alternatives

1. Use MaskedTextBox (this is easiest approach) explained here
http://msdn.microsoft.com/en-us/library/system.windows.forms.maskedtextbox.aspx[^]
2. In the KeyPress event if the Key pressed is not the required character then set e.Handled = true
3. In the KeyDown event if the key pressed is not the required character then set
e.SuppressKeyPress = true