


Using data annotations for custom validation in ASP.NET MVC
Data annotations in ASP.NET MVC are powerful tools for validating user input. The StringLength
attribute allows validating the length of a single string attribute. But what if you need to verify the combined length of multiple properties?
To do this, implement a custom validation attribute.
public class CombinedMinLengthAttribute : ValidationAttribute { // 构造函数 } // 方法
In custom attributes:
-
PropertyNames
Array holds the attribute names to be combined for length validation.
The -
IsValid
overridden method sums the length of the string attributes and compares it toMinLength
.
To use custom properties, decorate the properties in your view model as follows:
public class MyViewModel { [CombinedMinLength(20, "Bar", "Baz", ErrorMessage = "组合长度必须超过20")] public string Foo { get; set; } }
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