How I can find Data Annotation attributes and their parameters using reflection

问题

I have some data annotation attribute like this:

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

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

thanks

回答1:

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;}

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;

来源：https://stackoverflow.com/questions/7864662/how-i-can-find-data-annotation-attributes-and-their-parameters-using-reflection