ASP.NET RangeValidator控件存在异常 [英] ASP.NET RangeValidator Behaving Strangely

问题描述

有的类型属性被设置为串和它的最小值= 0和最大值= 100

It's type attribute is set to string and it's min value = 0 and the max value = 100.

我想，以确保输入的数据将不超过在数据库中定义的列长度。

I want to insure that the data entered won't exceed the column length defined in the database.

现在，当我测试了一下，始终显示错误消息，即使我输入一个字母或两个！

Now when I test it, it always display the error message even if I entered one letter or two!

推荐答案

您应该使用RegularEx pressionValidator这一点。 RangeValidators不是为字符串长度。设置ValidationEx pression喜欢的东西？，也可以将其缩小到像 \\ s？或 \\ w？或东西，如果你想要的。

You should use a RegularExpressionValidator for this. RangeValidators aren't for string lengths. Set the ValidationExpression to something like .?, or you can narrow it to something like \S? or \w? or something if you want.

另外，如果你有一个文本框，这不是在多行模式工作（而且也没有理由如果Max是一个字符，它会），你可以只设置 MAXLENGTH =1上的控制，你会根本不需要一个验证器。

Also, if you're working with a TextBox that's not in MultiLine mode (and there's no reason it would be if the max is one character) you can just set MaxLength="1" on the control and you won't need a validator at all.

编辑：：如果你想指定一个最大长度大于一对多行文本框，你可以使用一个RegularEx pressionValidator如上所述，但设置 ValidationEx pression = 为100的在正则表达式量词的更多信息请点击这里。

If you do want to specify a max length greater than one on a multiline TextBox, you can use a RegularExpressionValidator as described above, but set ValidationExpression=".{0,100}" for a maximum length of 100. More information on regex quantifiers is available here.

如果你有一个单行文本框，只需设置它的maxlength属性到所需的最大值，它不会允许任何东西都比较长;无需验证。

If you have a single-line TextBox, just set its MaxLength attribute to the desired maximum, and it won't allow anything longer than that; no validator required.

如果你想做的任何事情，涉及长度为用户类型吧，那是更加复杂的实时检测和你需要的JavaScript。还应该仍然验证输入服务器侧，因为用JavaScript任何用户关闭将能够绕过客户端验证

If you want to do anything involving real-time detection of the length as the user types it, that's more complicated and you'll need JavaScript. You should also still validate the input server-side, because any user with JavaScript turned off will be able to bypass client-side validation.

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