public void Issue1805_EntityConnection_is_not_subscribed_to_its_underlying_store_connection_event_after_it_has_been_disposed()
{
using (var ctx1 = new SimpleModelContext())
{
var connection = ctx1.Database.Connection;
connection.Open();
using (var txn = connection.BeginTransaction())
{
var stateChangeEventHandlerField = typeof(DbConnection).GetFields(
BindingFlags.NonPublic | BindingFlags.Instance).SingleOrDefault(fi => fi.Name == "_stateChangeEventHandler");
using (var ctx2 = new Issue1805Context(connection, false))
{
ctx2.Database.UseTransaction(txn);
ctx2.Database.Initialize(force: false);
// Now look up by reflection the event handler on the initial connection.
// That event handler's invocation list should contain a delegate to EntityConnection's
// StoreConnectionStateChangeHandler method because it subscribed to that
// event when it was created.
var stateChangeEventHandler = (StateChangeEventHandler)stateChangeEventHandlerField.GetValue(connection);
Assert.NotEmpty(stateChangeEventHandler.GetInvocationList().Where(
del => del.Target != null &&
del.Target.ToString() == "System.Data.Entity.Core.EntityClient.EntityConnection" &&
del.Method != null &&
del.Method.ToString().StartsWith("Void StoreConnectionStateChangeHandler")));
}
Assert.Equal(ConnectionState.Open, connection.State);
// Now look up the event handler on the initial connection again.
// That event handler should be null as the subscription to EntityConnection's
// StoreConnectionStateChangeHandler method (which would keep the EntityConnection
// alive which in turn would prevent the Issue1805Context from being garbage-collected)
// should have been unsubscribed during Dispose() on the EntityConnection.
Assert.Null(stateChangeEventHandlerField.GetValue(connection));
}
}
}
public void Issue1805_EntityConnection_is_not_subscribed_to_its_underlying_store_connection_event_after_it_has_been_disposed()
{
using (var ctx1 = new SimpleModelContext())
{
var connection = ctx1.Database.Connection;
connection.Open();
using (var txn = connection.BeginTransaction())
{
var stateChangeEventHandlerField = typeof(DbConnection).GetFields(
BindingFlags.NonPublic | BindingFlags.Instance).SingleOrDefault(fi => fi.Name == "_stateChangeEventHandler");
using (var ctx2 = new Issue1805Context(connection, false))
{
ctx2.Database.UseTransaction(txn);
ctx2.Database.Initialize(force: false);
// Now look up by reflection the event handler on the initial connection.
// That event handler's invocation list should contain a delegate to EntityConnection's
// StoreConnectionStateChangeHandler method because it subscribed to that
// event when it was created.
var stateChangeEventHandler = (StateChangeEventHandler)stateChangeEventHandlerField.GetValue(connection);
Assert.NotEmpty(stateChangeEventHandler.GetInvocationList().Where(
del => del.Target != null
&& del.Target.ToString() == "System.Data.Entity.Core.EntityClient.EntityConnection"
&& del.Method != null
&& del.Method.ToString().StartsWith("Void StoreConnectionStateChangeHandler")));
}
Assert.Equal(ConnectionState.Open, connection.State);
// Now look up the event handler on the initial connection again.
// That event handler should be null as the subscription to EntityConnection's
// StoreConnectionStateChangeHandler method (which would keep the EntityConnection
// alive which in turn would prevent the Issue1805Context from being garbage-collected)
// should have been unsubscribed during Dispose() on the EntityConnection.
Assert.Null(stateChangeEventHandlerField.GetValue(connection));
}
}
}
