35 lines
1.3 KiB
C#
35 lines
1.3 KiB
C#
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using System;
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using System.ComponentModel.DataAnnotations;
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using System.Globalization;
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namespace Tapeti.DataAnnotations.Extensions
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{
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/// <summary>
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/// Can be used on Guid fields which are supposed to be Required, as the Required attribute does
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/// not work for Guids and making them Nullable is counter-intuitive.
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/// </summary>
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public class RequiredGuidAttribute : ValidationAttribute
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{
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private const string DefaultErrorMessage = "'{0}' does not contain a valid guid";
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private const string InvalidTypeErrorMessage = "'{0}' is not of type Guid";
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public RequiredGuidAttribute() : base(DefaultErrorMessage)
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{
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}
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protected override ValidationResult IsValid(object value, ValidationContext validationContext)
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{
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if (value == null)
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return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
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if (value.GetType() != typeof(Guid))
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return new ValidationResult(string.Format(InvalidTypeErrorMessage, validationContext.DisplayName));
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var guid = (Guid)value;
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return guid == Guid.Empty
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? new ValidationResult(FormatErrorMessage(validationContext.DisplayName))
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: null;
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}
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}
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}
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