Is it possible to use Data Annotations to validate parameters passed to an Action method of a Controller?

Question

I am using Data Annotations to validate my Model in ASP.NET MVC. This works well for action methods that has complex parameters e.g,

public class Params  
{  
    [Required] string Param1 {get; set;}   
    [StringLength(50)] string Param2 {get; set;}  
}


ActionResult MyAction(Params params)  
{  
   If(ModeState.IsValid)  
   {  
      // Do Something  
   }  
}

What if I want to pass a single string to an Action Method (like below). Is there a way to use Data Annotations or will I have to wrap the string into a class?

ActionResult MyAction(string param1, string param2)  
{  
   If(ModeState.IsValid)  
   {  
     // Do Something  
   }  
}  

Answer 1

Create your own model...

public class Params  
{  
    [Required] string param1 {get; set;}   
    [StringLength(50)] string param2 {get; set;}  
}

And change your signature of your server side controller:

[HttpGet]
ActionResult MyAction([FromUri] Params params)  
{  
    If(ModeState.IsValid)  
    {  
        // Do Something  
    }  
}  

If your client side code already worked you don't have to change it... Please, note that the properties of your Model are the same of the parameter you are passing now (string param1, string param2)... and they are case sensitive...

EDIT: I mean that you can call your controller in this way:

http://localhost/api/values/?param1=xxxx&param2=yyyy