98 lines
3.3 KiB
C#
98 lines
3.3 KiB
C#
using System.Collections.Generic;
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namespace System.ComponentModel.DataAnnotations {
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/// <summary>
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/// Used to mark an Entity member as an association
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/// </summary>
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[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
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public sealed class AssociationAttribute : Attribute {
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private string name;
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private string thisKey;
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private string otherKey;
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private bool isForeignKey;
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/// <summary>
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/// Full form of constructor
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/// </summary>
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/// <param name="name">The name of the association. For bi-directional associations, the name must
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/// be the same on both sides of the association</param>
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/// <param name="thisKey">Comma separated list of the property names of the key values
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/// on this side of the association</param>
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/// <param name="otherKey">Comma separated list of the property names of the key values
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/// on the other side of the association</param>
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public AssociationAttribute(string name, string thisKey, string otherKey) {
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this.name = name;
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this.thisKey = thisKey;
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this.otherKey = otherKey;
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}
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/// <summary>
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/// Gets the name of the association. For bi-directional associations, the name must
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/// be the same on both sides of the association
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/// </summary>
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public string Name {
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get { return this.name; }
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}
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/// <summary>
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/// Gets a comma separated list of the property names of the key values
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/// on this side of the association
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/// </summary>
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public string ThisKey {
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get {
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return this.thisKey;
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}
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}
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/// <summary>
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/// Gets a comma separated list of the property names of the key values
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/// on the other side of the association
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/// </summary>
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public string OtherKey {
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get {
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return this.otherKey;
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}
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}
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/// <summary>
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/// Gets or sets a value indicating whether this association member represents the foreign key
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/// side of an association
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/// </summary>
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public bool IsForeignKey {
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get {
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return this.isForeignKey;
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}
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set {
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this.isForeignKey = value;
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}
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}
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/// <summary>
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/// Gets the collection of individual key members specified in the ThisKey string.
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/// </summary>
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public IEnumerable<string> ThisKeyMembers {
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get {
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return GetKeyMembers(this.ThisKey);
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}
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}
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/// <summary>
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/// Gets the collection of individual key members specified in the OtherKey string.
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/// </summary>
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public IEnumerable<string> OtherKeyMembers {
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get {
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return GetKeyMembers(this.OtherKey);
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}
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}
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/// <summary>
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/// Parses the comma delimited key specified
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/// </summary>
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/// <param name="key">The key to parse</param>
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/// <returns>Array of individual key members</returns>
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private static string[] GetKeyMembers(string key) {
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return key.Replace(" ", string.Empty).Split(',');
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}
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}
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}
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