如何对文本框使用文本和数字验证 [英] how to use text and numeric validation to textbox
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问题描述
我用c#创建了一个Windows窗体，因为我想对文本框应用验证，即仅输入文本或仅输入数字值.
请帮助我.
在此先感谢.
I created a windows form in c# ,in that for textbox I want to apply validation i.e Only to enter the text or to enter only numeric values.
please help me in this.
Thanks in Advance.
推荐答案
您提到Javascript很好.最好在客户端执行此操作，因为您必须消耗的事件过于频繁.
方法如下:
That''s good you mention Javascript. It''s the best to do it on the client side, as the events you have to consume are too frequent.
Here is how:
<html>
<head>
<script type="text/javascript"><!--
function filterDigits(eventInstance) {
eventInstance = eventInstance || window.event;
key = eventInstance.keyCode || eventInstance.which;
if ((47 < key) && (key < 58) || key = 45 || key == 8) {
return true;
} else {
if (eventInstance.preventDefault) eventInstance.preventDefault();
eventInstance.returnValue = false;
return false;
} //if
} //filterDigits
--></script>
</head>
<body">
<input type="text" onkeypress="filterDigits(event)"/>
</body>
</html>
请注意，也允许使用退格键.由于某些历史原因，退格被认为是字符，无论如何都应允许退格.
Pay attention that backspace is also allowed. By some historical reasons backspace is considered a character and should be allowed anyway.
修复您在混淆中使用的标签.您是说C#和JavaScript还是在谈论winforms或ASP.Net.
如果您正在寻找ASP.Net验证，请参见此处 [ ^ ].
Firt the tag you''ve used in confusing. Are you talking about winforms or ASP.Net as you say C# and JavaScript.
If you are looking for ASP.Net validations, see here[^].
在按键事件中，用char.IsDigit检查每个键，然后决定要做什么.
In keypress event check each key with char.IsDigit and decide what to do.
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