2 // System.Runtime.InteropServices.ExtensibleClassFactory.cs
5 // Andreas Nahr (ClassDevelopment@A-SoftTech.com)
6 // Jonathan Chambers (joncham@gmail.com)
10 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
11 // Copyright (C) 2006 Jonathan Chambers
13 // Permission is hereby granted, free of charge, to any person obtaining
14 // a copy of this software and associated documentation files (the
15 // "Software"), to deal in the Software without restriction, including
16 // without limitation the rights to use, copy, modify, merge, publish,
17 // distribute, sublicense, and/or sell copies of the Software, and to
18 // permit persons to whom the Software is furnished to do so, subject to
19 // the following conditions:
21 // The above copyright notice and this permission notice shall be
22 // included in all copies or substantial portions of the Software.
24 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
25 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
26 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
27 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
28 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
29 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
30 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
33 using System.Diagnostics;
34 using System.Collections;
35 using System.Reflection;
37 namespace System.Runtime.InteropServices
40 public sealed class ExtensibleClassFactory
42 static readonly Hashtable hashtable = new Hashtable ();
44 private ExtensibleClassFactory ()
48 internal static ObjectCreationDelegate GetObjectCreationCallback (Type t)
50 return hashtable[t] as ObjectCreationDelegate;
53 public static void RegisterObjectCreationCallback (ObjectCreationDelegate callback) {
55 StackTrace trace = new StackTrace (false);
56 while (i < trace.FrameCount) {
57 StackFrame frame = trace.GetFrame (i);
58 MethodBase m = frame.GetMethod ();
59 if (m.MemberType == MemberTypes.Constructor && m.IsStatic) {
60 hashtable.Add (m.DeclaringType, callback);
65 throw new System.InvalidOperationException (
66 "RegisterObjectCreationCallback must be called from .cctor of class derived from ComImport type.");