Dump mvc ModelState errors to Debug console.

gistfile1.cs

using System.Linq;
using System.Web.Mvc;

public static class ModelStateDictionaryExtensions
{
#if DEBUG
    public static void DumpErrors(this ModelStateDictionary modelState)
    {
        
        var errors = modelState.Where(a => a.Value.Errors.Count > 0)
            .Select(b => new { b.Key, b.Value.Errors })
            .ToArray();

        foreach (var modelStateErrors in errors)
        {
            System.Diagnostics.Debug.WriteLine("Errors in {0}", modelStateErrors.Key);
            foreach(var error in modelStateErrors.Errors)
                System.Diagnostics.Debug.WriteLine("\tError: {0} ({1}) ", error.ErrorMessage, error.Exception == null ? "none" : error.Exception.Message);
        }

    }
#else
    public static void DumpErrors(this ModelStateDictionary modelState)
    {}
#endif
}

Thanks Dan appreciated. Good to see my blog post is being used!

http://garfbradazweb.wordpress.com/2011/09/05/mvc-3-modelstate-modelerrorcollection-debug/