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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.
/*============================================================
**
**
**
** RuntimeClass is the base class of all WinRT types
**
**
===========================================================*/
namespace System.Runtime.InteropServices.WindowsRuntime {
using System;
using System.Runtime.InteropServices;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Runtime.CompilerServices;
using System.Security;
// Local definition of Windows.Foundation.IStringable
[ComImport]
[Guid("96369f54-8eb6-48f0-abce-c1b211e627c3")]
[WindowsRuntimeImport]
internal interface IStringable
{
string ToString();
}
internal class IStringableHelper
{
internal static string ToString(object obj)
{
IGetProxyTarget proxy = obj as IGetProxyTarget;
if (proxy != null)
obj = proxy.GetTarget();
// Check whether the type implements IStringable.
IStringable stringableType = obj as IStringable;
if (stringableType != null)
{
return stringableType.ToString();
}
return obj.ToString();
}
}
//
// Base class for every WinRT class
// We'll make it a ComImport and WindowsRuntimeImport in the type loader
// as C# compiler won't allow putting code in ComImport type
//
internal abstract class RuntimeClass : __ComObject
{
//
// Support for ToString/GetHashCode/Equals override
//
[System.Security.SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
internal extern IntPtr GetRedirectedGetHashCodeMD();
[System.Security.SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
internal extern int RedirectGetHashCode(IntPtr pMD);
[System.Security.SecuritySafeCritical]
public override int GetHashCode()
{
IntPtr pMD = GetRedirectedGetHashCodeMD();
if (pMD == IntPtr.Zero)
return base.GetHashCode();
return RedirectGetHashCode(pMD);
}
[System.Security.SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
internal extern IntPtr GetRedirectedToStringMD();
[System.Security.SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
internal extern string RedirectToString(IntPtr pMD);
[System.Security.SecuritySafeCritical]
public override string ToString()
{
// Check whether the type implements IStringable.
IStringable stringableType = this as IStringable;
if (stringableType != null)
{
return stringableType.ToString();
}
else
{
IntPtr pMD = GetRedirectedToStringMD();
if (pMD == IntPtr.Zero)
return base.ToString();
return RedirectToString(pMD);
}
}
[System.Security.SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
internal extern IntPtr GetRedirectedEqualsMD();
[System.Security.SecurityCritical]
[MethodImpl(MethodImplOptions.InternalCall)]
internal extern bool RedirectEquals(object obj, IntPtr pMD);
[System.Security.SecuritySafeCritical]
public override bool Equals(object obj)
{
IntPtr pMD = GetRedirectedEqualsMD();
if (pMD == IntPtr.Zero)
return base.Equals(obj);
return RedirectEquals(obj, pMD);
}
}
}
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