验证十进制值2与数据的注解小数位？ [英] Validate decimal value to 2 decimal places with data annotations?

问题描述

我有这在我的视图模型：

I have this in my view model:

[Required(ErrorMessage = "Price is required")]
[Range(0.01, 999999999, ErrorMessage = "Price must be greater than 0.00")]
[DisplayName("Price ($)")]
public decimal Price { get; set; }

我想验证用户没有输入超过2位小数。所以我想有

I'd like to validate that the user doesn't enter more than 2 decimal places. So I'd like to have

有效值：12，12.3，12.34

Valid values: 12, 12.3, 12.34

无效值：12，12.345

Invalid values: 12., 12.345

有没有办法用数据注解来验证这一点？

Is there a way to validate this with a data annotation?

推荐答案

您可以使用RegularEx pression属性，与您的条件匹配一个正则表达式。这里有前pressions涉及的数字，我相信人会符合该法案的一大堆：
<一href=\"http://regexlib.com/DisplayPatterns.aspx?cattabindex=2&categoryId=3\">http://regexlib.com/DisplayPatterns.aspx?cattabindex=2&categoryId=3

You could use the RegularExpression attribute, with a regex that matches your criteria. There are a whole bunch of expressions here that involve numbers, I'm sure one will fit the bill: http://regexlib.com/DisplayPatterns.aspx?cattabindex=2&categoryId=3

这将让你开始，虽然它可能不会像你想的包容性（至少需要一个数字导致小数点）：

This will get you started, though it may not be as inclusive as you want (requires at least one digit leading the decimal point):

[RegularExpression(@"\d+(\.\d{1,2})?", ErrorMessage = "Invalid price"]

请注意，这是很难发出precise错误消息，因为你不知道正则表达式的一部分眼福（字符串z.22有小数位，例如正确的号码，但不是一个有效的价格）。

Note that it is difficult to emit a precise error message because you don't know which part of the regex failed to match (the string "z.22" has the correct number of decimal places, for example, but is not a valid price).

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