Fix src and dest indexes in DispatcherOperation ctor

The source and the destination indexes are confused. The source index, which
is the second parameter, should be 0 and the destination index, which is the
fourth parameter, should be 1.

2 files changed, 16 insertions, 1 deletions

diff --git a/mcs/class/WindowsBase/System.Windows.Threading/DispatcherOperation.cs b/mcs/class/WindowsBase/System.Windows.Threading/DispatcherOperation.cs
index 34bb93df7f4..5c06c41ac26 100644
--- a/mcs/class/WindowsBase/System.Windows.Threading/DispatcherOperation.cs
+++ b/mcs/class/WindowsBase/System.Windows.Threading/DispatcherOperation.cs
@@ -70,7 +70,7 @@ namespace System.Windows.Threading {
 			delegate_method = d;
 			delegate_args = new object [args.Length + 1];
 			delegate_args [0] = arg;
-			Array.Copy (args, 1, delegate_args, 0, args.Length);
+			Array.Copy (args, 0, delegate_args, 1, args.Length);
 		}
 
 		internal void Invoke ()
diff --git a/mcs/class/WindowsBase/Test/System.Windows.Threading/DispatcherTest.cs b/mcs/class/WindowsBase/Test/System.Windows.Threading/DispatcherTest.cs
index 629d3428947..614cef51a43 100644
--- a/mcs/class/WindowsBase/Test/System.Windows.Threading/DispatcherTest.cs
+++ b/mcs/class/WindowsBase/Test/System.Windows.Threading/DispatcherTest.cs
@@ -134,6 +134,21 @@ namespace MonoTests.System.Windows.Threading
 			if (fail)
 				throw new Exception ("Expected all states to run");
 		}
+
+		[Test]
+		public void TestTwoArguments()
+		{
+			Dispatcher d = Dispatcher.CurrentDispatcher;
+			DispatcherFrame frame = new DispatcherFrame();
+
+			d.BeginInvoke (DispatcherPriority.Normal, (Action<int, string>) delegate(int arg1, string arg2) {
+				Assert.AreEqual(10, arg1, "arg1");
+				Assert.AreEqual("OK", arg2, "arg2");
+				frame.Continue = false;
+			}, 10, "OK");
+
+			Dispatcher.PushFrame(frame);
+		}
 	}
 }