ASP.NET MVC ambiguous action methods

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MVC doesn’t support method overloading based solely on signature, so this will fail:

public ActionResult MyMethod(int someInt) { /* ... */ }
public ActionResult MyMethod(string someString) { /* ... */ }

However, it does support method overloading based on attribute:

[RequireRequestValue("someInt")]
public ActionResult MyMethod(int someInt) { /* ... */ }

[RequireRequestValue("someString")]
public ActionResult MyMethod(string someString) { /* ... */ }

public class RequireRequestValueAttribute : ActionMethodSelectorAttribute {
    public RequireRequestValueAttribute(string valueName) {
        ValueName = valueName;
    }
    public override bool IsValidForRequest(ControllerContext controllerContext, MethodInfo methodInfo) {
        return (controllerContext.HttpContext.Request[ValueName] != null);
    }
    public string ValueName { get; private set; }
}

In the above example, the attribute simply says “this method matches if the key xxx was present in the request.” You can also filter by information contained within the route (controllerContext.RequestContext) if that better suits your purposes.

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