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using System.ComponentModel.DataAnnotations.Resources;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
namespace System.ComponentModel.DataAnnotations.Schema {
/// <summary>
/// Denotes a property used as a foreign key in a relationship.
/// The annotation may be placed on the foreign key property and specify the associated navigation property name,
/// or placed on a navigation property and specify the associated foreign key name.
/// </summary>
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
[SuppressMessage("Microsoft.Performance", "CA1813:AvoidUnsealedAttributes", Justification = "We want users to be able to extend this class")]
public class ForeignKeyAttribute : Attribute {
private readonly string _name;
/// <summary>
/// Initializes a new instance of the <see cref="ForeignKeyAttribute"/> class.
/// </summary>
/// <param name="name">
/// If placed on a foreign key property, the name of the associated navigation property.
/// If placed on a navigation property, the name of the associated foreign key(s).
/// If a navigation property has multiple foreign keys, a comma separated list should be supplied.
/// </param>
public ForeignKeyAttribute(string name) {
if (string.IsNullOrWhiteSpace(name)) {
throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, DataAnnotationsResources.ArgumentIsNullOrWhitespace, "name"));
}
_name = name;
}
/// <summary>
/// If placed on a foreign key property, the name of the associated navigation property.
/// If placed on a navigation property, the name of the associated foreign key(s).
/// </summary>
public string Name {
get { return _name; }
}
}
}
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