C# 如何获得 BackSpace - 文本框中只有数字限制？
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How to get BackSpace - with only numbers limit in textbox?
提问by Gold
I insert this on KeyPressevent:
我在KeyPress事件中插入这个：
e.Handled = !Char.IsNumber(e.KeyChar);
But I don't have the Backspacekey, how to fix it?
但是我没有Backspace钥匙，怎么修？
采纳答案by Jon Skeet
How about:
怎么样：
e.Handled = !(Char.IsNumber(e.KeyChar) || e.KeyChar == 8);
Or equivalently:
或等效地：
e.Handled = !Char.IsNumber(e.KeyChar) && e.KeyChar != 8;
(As in roman's answer, you can use '\b'instead of 8 in the above code too.)
（在roman's answer 中，您也可以'\b'在上面的代码中使用8 代替。）
回答by roman m
here's how to check if backspace was pressed:
以下是检查是否按下退格键的方法：
if(e.KeyChar == '\b'){//backspace was pressed}
回答by anfd
backspace key
e.KeyChar == (char) Keys.Back
退格键
e.KeyChar == (char) Keys.Back
