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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Http;
public static class ModelStateDictionaryExtensions
public static IEnumerable<string> ToErrors(this ModelStateDictionary dict)
return dict.OrderBy(kvp => kvp.Key)
.SelectMany(kvp => kvp.Value.Errors.Select(e => Tuple.Create(kvp.Key, e.ErrorMessage)))
.Select(tuple => String.Format("{0} = {1}", tuple.Item1, tuple.Item2));
public void SampleTest()
var modelStateDictionary = SomethingUnderTest();
error => Assert.Equal("key1 = The first value for key1"),
error => Assert.Equal("key1 = The second value for key1"),
error => Assert.Equal("key2 = The first value for key2")
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