70 lines
2.3 KiB
C#
70 lines
2.3 KiB
C#
//
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// System.Runtime.InteropServices.ExtensibleClassFactory.cs
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//
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// Author:
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// Andreas Nahr (ClassDevelopment@A-SoftTech.com)
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// Jonathan Chambers (joncham@gmail.com)
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//
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//
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// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
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// Copyright (C) 2006 Jonathan Chambers
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System.Diagnostics;
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using System.Collections;
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using System.Reflection;
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namespace System.Runtime.InteropServices
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{
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[ComVisible (true)]
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public sealed class ExtensibleClassFactory
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{
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static readonly Hashtable hashtable = new Hashtable ();
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private ExtensibleClassFactory ()
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{
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}
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internal static ObjectCreationDelegate GetObjectCreationCallback (Type t)
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{
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return hashtable[t] as ObjectCreationDelegate;
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}
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public static void RegisterObjectCreationCallback (ObjectCreationDelegate callback) {
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int i = 1;
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StackTrace trace = new StackTrace (false);
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while (i < trace.FrameCount) {
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StackFrame frame = trace.GetFrame (i);
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MethodBase m = frame.GetMethod ();
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if (m.MemberType == MemberTypes.Constructor && m.IsStatic) {
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hashtable.Add (m.DeclaringType, callback);
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return;
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}
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i++;
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}
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throw new System.InvalidOperationException (
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"RegisterObjectCreationCallback must be called from .cctor of class derived from ComImport type.");
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}
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}
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}
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