Question

Given a model with these data annotations:

public class Example
{
    [Required]
    [Display(Name = "Activity response")]
    public string ActivityResponse { get; set; }
}

I would expect the model state error message to be “The Activity response field is required.” Instead it is “The ActivityResponse field is required.”

Answer 1

Had the same problem and I made a workaround for it.
I know it is not perfect.

For every dataannotation attribute create a new class

public class RequiredAttribute : System.ComponentModel.DataAnnotations.RequiredAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        validationContext.DisplayName = ModelMetadataProviders
            .Current
            .GetMetadataForProperty(null, validationContext.ObjectType, validationContext.DisplayName)
            .DisplayName;
        return base.IsValid(value, validationContext);
    }
}



public class StringLengthAttribute : System.ComponentModel.DataAnnotations.StringLengthAttribute
{
    public StringLengthAttribute(int maximumLength)
        : base(maximumLength)
    { }

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
         validationContext.DisplayName = ModelMetadataProviders
             .Current
             .GetMetadataForProperty(null, validationContext.ObjectType, validationContext.DisplayName)
             .DisplayName;
         return base.IsValid(value, validationContext);
    }
}

etc….