asp.net - Get action info from ModelValidator

Question

I'm implementing a ModelValidator that needs to get reflected information from the executing action. Validation behavior will change depending on how action is decorated. Can I get that information?

Answer 1

您的 ModelValidator 的构造函数应该采用 ControllerContext。您可以使用该对象来确定您的控制器装饰有哪些属性，如下所示：

context.Controller.GetType().GetCustomAttributes(typeof(YourAttribute), true).Length > 0

编辑：

您还可以获得所有属性的列表，如下所示：

attributes = context.Controller.GetType().GetCustomAttributes(true);

因此，一个基于特定属性进行验证的简单示例：

public class SampleValidator : ModelValidator {
    private ControllerContext _context { get; set; }

    public SampleValidator(ModelMetadata metadata, ControllerContext context, 
        string compareProperty, string errorMessage) : base(metadata, context) {
        _controllerContext = context;
    }

    public override IEnumerable<ModelValidationResult> Validate(object container) {
        if (_context.Controller.GetType().GetCustomAttributes(typeof(YourAttribute), true).Length > 0) {
            // do some custom validation
        }

        if (_context.Controller.GetType().GetCustomAttributes(typeof(AnotherAttribute), true).Length > 0) {
            // do something else
        }
    }
}

}

Answer 2

反编译 System.Web.Mvc 后，我得到了它：

protected override IEnumerable<ModelValidator> GetValidators(ModelMetadata metadata, ControllerContext context, IEnumerable<Attribute> attributes)
{
    ReflectedControllerDescriptor controllerDescriptor = new ReflectedControllerDescriptor(context.Controller.GetType());
    ReflectedActionDescriptor actionDescriptor = (ReflectedActionDescriptor) controllerDescriptor.FindAction(context, context.RouteData.GetRequiredString("action"));
    object[] actionAttributes = actionDescriptor.GetCustomAttributes(typeof(MyAttribute), true);
}