How can I centralize modelstate validation in asp.net mvc using action filters?

Question

I write this code in several places and always repeat this logic:

public ActionResult MyMethod(MyModel collection)
{
    if (!ModelState.IsValid)
    {
              


        

Answer 1

Here is how to use the code from Khanh TO (from asp.net official site):

To apply this filter to all Web API controllers, add an instance of the filter to the HttpConfiguration.Filters collection during configuration:

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.Filters.Add(new ValidateModelAttribute());

        // ...
    }
}

Another option is to set the filter as an attribute on individual controllers or controller actions:

public class ProductsController : ApiController
{
  [ValidateModel]
  public HttpResponseMessage Post(Product product)
  {
    // ...
  }
}