File size: 3,422 Bytes
8c763fb | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 | // Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Collections.Generic;
using System.Management.Automation.ComInterop;
namespace System.Management.Automation.InteropServices
{
internal partial class ComEventsSink
{
private void Initialize(object rcw, Guid iid)
{
_iidSourceItf = iid;
Advise(rcw);
}
public void AddHandler(int dispid, object func)
{
ComEventsMethod method = FindMethod(dispid);
method ??= AddMethod(dispid);
if (func is Delegate d)
{
method.AddDelegate(d);
}
else
{
method.AddDelegate(new SplatCallSite.InvokeDelegate(new SplatCallSite(func).Invoke), wrapArgs: true);
}
}
public void RemoveHandler(int dispid, object func)
{
ComEventsMethod sinkEntry = FindMethod(dispid);
if (sinkEntry == null)
{
return;
}
if (func is Delegate d)
{
sinkEntry.RemoveDelegate(d);
}
else
{
// Remove the delegate from multicast delegate chain.
// We will need to find the delegate that corresponds
// to the func handler we want to remove. This will be
// easy since we Target property of the delegate object
// is a ComEventCallContext object.
sinkEntry.RemoveDelegates(d => d.Target is SplatCallSite callContext && callContext._callable.Equals(func));
}
// If the delegates chain is empty - we can remove
// corresponding ComEvenSinkEntry
if (sinkEntry.Empty)
RemoveMethod(sinkEntry);
if (_methods == null || _methods.Empty)
{
Unadvise();
_iidSourceItf = Guid.Empty;
}
}
public static ComEventsSink FromRuntimeCallableWrapper(object rcw, Guid sourceIid, bool createIfNotFound)
{
List<ComEventsSink> comEventSinks = ComEventSinksContainer.FromRuntimeCallableWrapper(rcw, createIfNotFound);
if (comEventSinks == null)
{
return null;
}
ComEventsSink comEventSink = null;
lock (comEventSinks)
{
foreach (ComEventsSink sink in comEventSinks)
{
if (sink._iidSourceItf == sourceIid)
{
comEventSink = sink;
break;
}
if (sink._iidSourceItf == Guid.Empty)
{
// we found a ComEventSink object that
// was previously disposed. Now we will reuse it.
sink.Initialize(rcw, sourceIid);
comEventSink = sink;
}
}
if (comEventSink == null && createIfNotFound)
{
comEventSink = new ComEventsSink(rcw, sourceIid);
comEventSinks.Add(comEventSink);
}
}
return comEventSink;
}
}
}
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