ValidationContext.MemberName is set incorrectly in the DataAnnotationsModelValidator

[mkArtakMSFT]

Problem Description

My customer creating custom validation class which deliveerd from System.ComponentModel.DataAnnotations.ValidationAttribute.
Using this in .NET4.7.1 ASP.NET Web API 2.0, ValidationContext.MemberName is set "DisplayName".
This is problem for custom class because they can not know MemberName without this property.

• Expected behavior
  ValidationContext.MemberName is "TestValue3"
• Actual behavior
  ValidationContext.MemberName is "Display name From 'DisplayAttribute'"

TestValue3 is set "DisplayAttribute".

    public class TestModel
    {
        [Validations.CustomValidation]
        public string TestValue1 { get; set; }
        [Validations.CustomValidation(ErrorMessage = "ErrorMessage: {0} ErrorMessage")]
        public string TestValue2 { get; set; }
        [Validations.CustomValidation(ErrorMessage = "ErrorMessage: {0} ErrorMessage")]
        [Display(Name = "Display name From 'DisplayAttribute'")]
        public string TestValue3 { get; set; }
        public string Message { get; set; }
    }

[mkArtakMSFT]

@dougbu, please associate the fix we've discussed with this bug. //cc: @danroth27

[dougbu]

For historical interest: Was a PR for this in the old CodePlex repo http://aspnetwebstack.codeplex.com/SourceControl/network/forks/astolfoho/fixWebApi/contribution/8918. But, I can't find an earlier issue on this.

[dougbu]

Moved to 3.2.5 (really 3.2.5-preview1).

[dougbu]

9829dd8