/// <summary>
/// Detach the tracked entity and related links from the <see cref="DataServiceContext"/>.
/// </summary>
/// <param name="context">The <see cref="DataServiceContext"/> containing the entity.</param>
/// <param name="entity">The entity to detach.</param>
public static void ClearTrackedEntity(this DataServiceContext context, object entity)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (entity == null)
{
throw new ArgumentNullException("entity");
}
foreach (LinkDescriptor linkDescriptor in context.Links)
{
if (linkDescriptor.Source == entity || linkDescriptor.Target == entity)
{
context.DetachLink(linkDescriptor.Source, linkDescriptor.SourceProperty, linkDescriptor.Target);
}
}
foreach (EntityDescriptor entityDescriptor in context.Entities)
{
if (entityDescriptor.Entity == entity)
{
context.Detach(entity);
break;
}
}
}
static void ReadETagsAndDetach(DataServiceContext context, Action <object, string> write)
{
foreach (var entity in context.Entities)
{
write(entity.Entity, entity.ETag);
context.Detach(entity.Entity);
}
}
public static void DetachAll(this DataServiceContext context)
{
foreach (var descriptor in context.EntityTracker.Entities)
{
context.Detach(descriptor.Entity);
}
foreach (var link in context.EntityTracker.Links)
{
context.DetachLink(link.Source, link.SourceProperty, link.Target);
}
}
/// <summary>
/// Resets the specified DataServiceContext object to remove all the entities.
/// </summary>
/// <param name="ctx">The DataServiceContext object.</param>
public static void Reset(this DataServiceContext ctx)
{
foreach (LinkDescriptor link in ctx.Links)
{
ctx.DetachLink(link.Source, link.SourceProperty, link.Target);
}
foreach (EntityDescriptor entity in ctx.Entities)
{
ctx.Detach(entity.Entity);
}
}
public static void ClearContext(DataServiceContext context)
{
Debug.Assert(context != null, "context != null");
foreach (var link in context.Links)
{
context.DetachLink(link.Source, link.SourceProperty, link.Target);
}
foreach (var entity in context.Entities)
{
context.Detach(entity.Entity);
}
}
public static T CreateEntity <T>(DataServiceContext ctx, string entitySetName, EntityStates state, DataServiceQuery <T> query) where T : class, new()
{
T entity = null;
try
{
switch (state)
{
case EntityStates.Added:
entity = new T();
ctx.AddObject(entitySetName, entity);
break;
case EntityStates.Deleted:
entity = CreateEntity(ctx, entitySetName, EntityStates.Unchanged, query);
ctx.DeleteObject(entity);
break;
case EntityStates.Detached:
entity = query.Execute().Single();
Assert.AreEqual(MergeOption.NoTracking != ctx.MergeOption, ctx.Detach(entity));
break;
case EntityStates.Unchanged:
entity = query.Execute().Single();
if (MergeOption.NoTracking == ctx.MergeOption)
{
ctx.AttachTo(entitySetName, entity);
}
break;
case EntityStates.Modified:
entity = CreateEntity(ctx, entitySetName, EntityStates.Unchanged, query);
ctx.UpdateObject(entity);
break;
default:
Assert.Fail(String.Format("unexpected state encountered: {0}", state));
break;
}
}
catch (Exception ex)
{
Assert.Fail("{0}", ex);
}
return(entity);
}
private static void AttachAndLog(StringBuilder output, DataServiceContext ctx, string entitySetName, object entity)
{
try
{
ctx.AttachTo(entitySetName, entity);
EntityDescriptor entityDescriptor = ctx.Entities[0];
entityDescriptor.Identity.Should().Be(entityDescriptor.EditLink.AbsoluteUri);
output.AppendLine(entityDescriptor.EditLink.OriginalString);
ctx.Detach(entity);
}
catch (Exception e)
{
var exception = e;
while (exception != null)
{
output.Append(exception.GetType().FullName);
output.Append(": ");
output.AppendLine(exception.Message);
exception = exception.InnerException;
}
}
}
private static void AttachAndLog(StringBuilder output, DataServiceContext ctx, string entitySetName, object entity)
{
try
{
ctx.AttachTo(entitySetName, entity);
EntityDescriptor entityDescriptor = ctx.Entities[0];
entityDescriptor.Identity.Should().Be(entityDescriptor.EditLink.AbsoluteUri);
output.AppendLine(entityDescriptor.EditLink.OriginalString);
ctx.Detach(entity);
}
catch (Exception e)
{
var exception = e;
while (exception != null)
{
output.Append(exception.GetType().FullName);
output.Append(": ");
output.AppendLine(exception.Message);
exception = exception.InnerException;
}
}
}
/// <summary>
/// Applies this state to the specfied <paramref name="target"/> such that after invocation,
/// the target in the given <paramref name="context"/> is in this state.
/// </summary>
/// <param name="context">Context to apply changes to.</param>
/// <param name="target">Target to change state on.</param>
/// <param name="entitySetName">Name of entity set (necessary for certain transitions).</param>
public void ApplyToObject(DataServiceContext context, object target, string entitySetName)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (target == null)
{
throw new ArgumentNullException("target");
}
EntityStates current = GetStateForEntity(context, target);
if (current == this.state)
{
return;
}
switch (this.state)
{
case EntityStates.Added:
if (current != EntityStates.Detached)
{
context.Detach(target);
}
context.AddObject(entitySetName, target);
break;
case EntityStates.Detached:
context.Detach(target);
break;
case EntityStates.Deleted:
if (current == EntityStates.Detached)
{
context.AttachTo(entitySetName, target);
}
context.DeleteObject(target);
break;
case EntityStates.Modified:
if (current == EntityStates.Detached)
{
context.AttachTo(entitySetName, target);
}
context.UpdateObject(target);
break;
case EntityStates.Unchanged:
if (current != EntityStates.Detached)
{
context.Detach(target);
}
context.AttachTo(entitySetName, target);
break;
}
}
/// <summary>
/// Applies this state to the specfied <paramref name="target"/> such that after invocation,
/// the target in the given <paramref name="context"/> is in this state.
/// </summary>
/// <param name="context">Context to apply changes to.</param>
/// <param name="target">Target to change state on.</param>
/// <param name="entitySetName">Name of entity set (necessary for certain transitions).</param>
public void ApplyToObject(DataServiceContext context, object target, string entitySetName)
{
if (context == null)
{
throw new ArgumentNullException("context");
}
if (target == null)
{
throw new ArgumentNullException("target");
}
EntityStates current = GetStateForEntity(context, target);
if (current == this.state)
{
return;
}
switch (this.state)
{
case EntityStates.Added:
if (current != EntityStates.Detached)
{
context.Detach(target);
}
context.AddObject(entitySetName, target);
break;
case EntityStates.Detached:
context.Detach(target);
break;
case EntityStates.Deleted:
if (current == EntityStates.Detached)
{
context.AttachTo(entitySetName, target);
}
context.DeleteObject(target);
break;
case EntityStates.Modified:
if (current == EntityStates.Detached)
{
context.AttachTo(entitySetName, target);
}
context.UpdateObject(target);
break;
case EntityStates.Unchanged:
if (current != EntityStates.Detached)
{
context.Detach(target);
}
context.AttachTo(entitySetName, target);
break;
}
}
public static void ClearContext(DataServiceContext context)
{
Debug.Assert(context != null, "context != null");
foreach (var link in context.Links)
{
context.DetachLink(link.Source, link.SourceProperty, link.Target);
}
foreach (var entity in context.Entities)
{
context.Detach(entity.Entity);
}
}
