如何使用反射找到数据注释属性及其参数 [英] How I can find Data Annotation attributes and their parameters using reflection

问题描述

我有一些这样的数据注释属性:

I have some data annotation attribute like this:

[StringLength(20, MinimumLength = 5, ErrorMessage = "First name must be between 5 and 20 characters")]

如何使用反射查找数据注释属性及其参数?

How I can Find Data Annotation attributes and their parameters using reflection?

谢谢

推荐答案

我假设你有这样的事情:

I assume you have something like this:

[StringLength(20, MinimumLength = 5, ErrorMessage = "First name must be between 5 and 20 characters")]
public string FirstName {get;set;}

要从中获取属性和属性:

To get the attribute and a property from it:

StringLengthAttribute strLenAttr = 
  typeof(Person).GetProperty("FirstName").GetCustomAttributes(
  typeof(StringLengthAttribute), false).Cast<StringLengthAttribute>().Single();


int maxLen = strLenAttribute.MaximumLength;

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