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
|
//------------------------------------------------------------------------------
// <copyright file="GCUtil.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Util {
using System;
using System.Runtime.InteropServices;
using System.Security.Permissions;
// Provides helper methods for wrapping managed objects so that they can be passed to and from unmanaged code.
// Unmanaged code can't actually inspect these objects at all since they're just GCHandles. And these handles
// cannot be reused (they're single-shot).
[SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
internal static class GCUtil {
public static IntPtr RootObject(object obj) {
return (obj != null)
? (IntPtr)GCHandle.Alloc(obj)
: IntPtr.Zero;
}
public static object UnrootObject(IntPtr pointer) {
if (pointer != IntPtr.Zero) {
GCHandle gcHandle = (GCHandle)pointer;
if (gcHandle.IsAllocated) {
object target = gcHandle.Target;
gcHandle.Free();
return target;
}
}
return null;
}
}
}
|
