// <summary>
// Creates a clone of the given <see cref="ObjectContext" />. The underlying <see cref="DbConnection" /> of
// the context is also cloned and the given connection string is used for the connection string of
// the cloned connection.
// </summary>
public ClonedObjectContext(
ObjectContextProxy objectContext,
DbConnection connection,
string connectionString,
bool transferLoadedAssemblies = true)
{
DebugCheck.NotNull(objectContext);
// connectionString may be null when connection has been created from DbContextInfo using just a provider
if (connection == null
|| connection.State != ConnectionState.Open)
{
connection =
DbProviderServices.GetProviderFactory(objectContext.Connection.StoreConnection).CreateConnection();
DbInterception.Dispatch.Connection.SetConnectionString(
connection,
new DbConnectionPropertyInterceptionContext<string>().WithValue(connectionString));
_connectionCloned = true;
}
_clonedEntityConnection = objectContext.Connection.CreateNew(connection);
_objectContext = objectContext.CreateNew(_clonedEntityConnection);
_objectContext.CopyContextOptions(objectContext);
if (!String.IsNullOrWhiteSpace(objectContext.DefaultContainerName))
{
_objectContext.DefaultContainerName = objectContext.DefaultContainerName;
}
if (transferLoadedAssemblies)
{
TransferLoadedAssemblies(objectContext);
}
}
/// <summary>
/// Creates a clone of the given <see cref="ObjectContext" />. The underlying <see cref="DbConnection" /> of
/// the context is also cloned and the given connection string is used for the connection string of
/// the cloned connection.
/// </summary>
public ClonedObjectContext(
ObjectContextProxy objectContext, string connectionString, bool transferLoadedAssemblies = true)
{
DebugCheck.NotNull(objectContext);
// connectionString may be null when connection has been created from DbContextInfo using just a provider
var clonedConnection =
DbProviderServices.GetProviderFactory(objectContext.Connection.StoreConnection).CreateConnection();
clonedConnection.ConnectionString = connectionString;
var clonedEntityConnection = objectContext.Connection.CreateNew(clonedConnection);
_objectContext = objectContext.CreateNew(clonedEntityConnection);
_objectContext.CopyContextOptions(objectContext);
if (!String.IsNullOrWhiteSpace(objectContext.DefaultContainerName))
{
_objectContext.DefaultContainerName = objectContext.DefaultContainerName;
}
if (transferLoadedAssemblies)
{
TransferLoadedAssemblies(objectContext);
}
}
public virtual void CopyContextOptions(ObjectContextProxy source)
{
this._objectContext.ContextOptions.LazyLoadingEnabled = source._objectContext.ContextOptions.LazyLoadingEnabled;
this._objectContext.ContextOptions.ProxyCreationEnabled = source._objectContext.ContextOptions.ProxyCreationEnabled;
this._objectContext.ContextOptions.UseCSharpNullComparisonBehavior = source._objectContext.ContextOptions.UseCSharpNullComparisonBehavior;
this._objectContext.ContextOptions.UseConsistentNullReferenceBehavior = source._objectContext.ContextOptions.UseConsistentNullReferenceBehavior;
this._objectContext.ContextOptions.UseLegacyPreserveChangesBehavior = source._objectContext.ContextOptions.UseLegacyPreserveChangesBehavior;
this._objectContext.CommandTimeout = source._objectContext.CommandTimeout;
this._objectContext.InterceptionContext = source._objectContext.InterceptionContext.WithObjectContext(this._objectContext);
}
public virtual void CopyContextOptions(ObjectContextProxy source)
{
_objectContext.ContextOptions.LazyLoadingEnabled = source._objectContext.ContextOptions.LazyLoadingEnabled;
_objectContext.ContextOptions.ProxyCreationEnabled = source._objectContext.ContextOptions.ProxyCreationEnabled;
_objectContext.ContextOptions.UseCSharpNullComparisonBehavior =
source._objectContext.ContextOptions.UseCSharpNullComparisonBehavior;
_objectContext.ContextOptions.UseConsistentNullReferenceBehavior =
source._objectContext.ContextOptions.UseConsistentNullReferenceBehavior;
_objectContext.ContextOptions.UseLegacyPreserveChangesBehavior =
source._objectContext.ContextOptions.UseLegacyPreserveChangesBehavior;
}
public virtual void CopyContextOptions(ObjectContextProxy source)
{
_objectContext.ContextOptions.LazyLoadingEnabled = source._objectContext.ContextOptions.LazyLoadingEnabled;
_objectContext.ContextOptions.ProxyCreationEnabled = source._objectContext.ContextOptions.ProxyCreationEnabled;
_objectContext.ContextOptions.UseCSharpNullComparisonBehavior =
source._objectContext.ContextOptions.UseCSharpNullComparisonBehavior;
_objectContext.ContextOptions.UseConsistentNullReferenceBehavior =
source._objectContext.ContextOptions.UseConsistentNullReferenceBehavior;
_objectContext.ContextOptions.UseLegacyPreserveChangesBehavior =
source._objectContext.ContextOptions.UseLegacyPreserveChangesBehavior;
}
public virtual void CopyContextOptions(ObjectContextProxy source)
{
_objectContext.ContextOptions.LazyLoadingEnabled = source._objectContext.ContextOptions.LazyLoadingEnabled;
_objectContext.ContextOptions.ProxyCreationEnabled = source._objectContext.ContextOptions.ProxyCreationEnabled;
_objectContext.ContextOptions.UseCSharpNullComparisonBehavior =
source._objectContext.ContextOptions.UseCSharpNullComparisonBehavior;
_objectContext.ContextOptions.UseConsistentNullReferenceBehavior =
source._objectContext.ContextOptions.UseConsistentNullReferenceBehavior;
_objectContext.ContextOptions.UseLegacyPreserveChangesBehavior =
source._objectContext.ContextOptions.UseLegacyPreserveChangesBehavior;
_objectContext.CommandTimeout = source._objectContext.CommandTimeout;
_objectContext.ContextOptions.DisableFilterOverProjectionSimplificationForCustomFunctions = source._objectContext.ContextOptions.DisableFilterOverProjectionSimplificationForCustomFunctions;
_objectContext.InterceptionContext = source._objectContext.InterceptionContext.WithObjectContext(_objectContext);
}
/// <summary>
/// Finds the assemblies that were used for loading o-space types in the source context
/// and loads those assemblies in the cloned context.
/// </summary>
private void TransferLoadedAssemblies(ObjectContextProxy source)
{
Contract.Requires(source != null);
var objectItemCollection = source.GetObjectItemCollection();
var assemblies = objectItemCollection
.Where(i => i is EntityType || i is ComplexType)
.Select(i => source.GetClrType((StructuralType)i).Assembly)
.Union(
objectItemCollection.OfType<EnumType>()
.Select(i => source.GetClrType(i).Assembly))
.Distinct();
foreach (var assembly in assemblies)
{
_objectContext.LoadFromAssembly(assembly);
}
}
/// <summary>
/// Creates a clone of the given <see cref="ObjectContext"/>. The underlying <see cref="DbConnection"/> of
/// the context is also cloned and the given connection string is used for the connection string of
/// the cloned connection.
/// </summary>
public ClonedObjectContext(
ObjectContextProxy objectContext, string connectionString, bool transferLoadedAssemblies = true)
{
Contract.Requires(objectContext != null);
Contract.Requires(!string.IsNullOrWhiteSpace(connectionString));
var clonedConnection =
DbProviderServices.GetProviderFactory(objectContext.Connection.StoreConnection).CreateConnection();
clonedConnection.ConnectionString = connectionString;
var clonedEntityConnection = objectContext.Connection.CreateNew(clonedConnection);
_objectContext = objectContext.CreateNew(clonedEntityConnection);
if (!String.IsNullOrWhiteSpace(objectContext.DefaultContainerName))
{
_objectContext.DefaultContainerName = objectContext.DefaultContainerName;
}
if (transferLoadedAssemblies)
{
TransferLoadedAssemblies(objectContext);
}
}
/// <summary>
/// Disposes both the underlying ObjectContext and its store connection.
/// </summary>
public void Dispose()
{
if (_objectContext != null)
{
var tempContext = _objectContext;
var connection = Connection;
_objectContext = null;
tempContext.Dispose();
connection.Dispose();
}
}
// <summary>
// Disposes both the underlying ObjectContext and its store connection.
// </summary>
public void Dispose()
{
if (_objectContext != null)
{
var tempContext = _objectContext;
var connection = Connection;
_objectContext = null;
tempContext.Dispose();
// EntityConnection should be disposed of before store connection is disposed. EntityConnection dispose method unsubscribes from StateChanged event
// on the underlying store connection, so if order is reversed we try to modify an already disposed object.
_clonedEntityConnection.Dispose();
if (_connectionCloned)
{
DbInterception.Dispatch.Connection.Dispose(connection, new DbInterceptionContext());
}
}
}
