67 lines
2.4 KiB
C#
67 lines
2.4 KiB
C#
//---------------------------------------------------------------------
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// <copyright file="EntityWithChangeTrackerStrategy.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//---------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Data.Objects.DataClasses;
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using System.Diagnostics;
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namespace System.Data.Objects.Internal
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{
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/// <summary>
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/// Implementation of the change tracking strategy for entities that support change trackers.
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/// These are typically entities that implement IEntityWithChangeTracker.
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/// </summary>
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internal sealed class EntityWithChangeTrackerStrategy : IChangeTrackingStrategy
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{
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private IEntityWithChangeTracker _entity;
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/// <summary>
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/// Constructs a strategy object that will cause the change tracker to be set onto the
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/// given object.
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/// </summary>
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/// <param name="entity">The object onto which a change tracker will be set</param>
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public EntityWithChangeTrackerStrategy(IEntityWithChangeTracker entity)
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{
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_entity = entity;
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}
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// See IChangeTrackingStrategy documentation
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public void SetChangeTracker(IEntityChangeTracker changeTracker)
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{
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_entity.SetChangeTracker(changeTracker);
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}
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// See IChangeTrackingStrategy documentation
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public void TakeSnapshot(EntityEntry entry)
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{
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if (entry != null && entry.RequiresComplexChangeTracking)
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{
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entry.TakeSnapshot(true);
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}
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}
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// See IChangeTrackingStrategy documentation
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public void SetCurrentValue(EntityEntry entry, StateManagerMemberMetadata member, int ordinal, object target, object value)
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{
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member.SetValue(target, value);
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}
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// See IChangeTrackingStrategy documentation
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public void UpdateCurrentValueRecord(object value, EntityEntry entry)
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{
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// Has change tracker, but may or may not be a proxy
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bool isProxy = entry.WrappedEntity.IdentityType != _entity.GetType();
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entry.UpdateRecordWithoutSetModified(value, entry.CurrentValues);
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if (isProxy)
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{
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entry.DetectChangesInProperties(true); // detect only complex property changes
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}
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}
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}
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}
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