Marshal.GetIUnknownForObjectInContext(Object) 方法
定义
重要
一些信息与预发行产品相关，相应产品在发行之前可能会进行重大修改。 对于此处提供的信息，Microsoft 不作任何明示或暗示的担保。
如果调用方与该对象位于同一上下文中，则从托管对象返回 IUnknown 接口。
public:
static IntPtr GetIUnknownForObjectInContext(System::Object ^ o);public static IntPtr GetIUnknownForObjectInContext(object o);[System.Security.SecurityCritical]
public static IntPtr GetIUnknownForObjectInContext(object o);static member GetIUnknownForObjectInContext : obj -> nativeint[<System.Security.SecurityCritical>]
static member GetIUnknownForObjectInContext : obj -> nativeintPublic Shared Function GetIUnknownForObjectInContext (o As Object) As IntPtr参数
- o
- Object
请求其 IUnknown 接口的对象。
返回
IntPtr
nativeint
IUnknown指定对象的指针，或者null调用方与指定对象不在同一上下文中。
- 属性
示例
以下示例演示如何使用IUnknown该方法检索GetIUnknownForObjectInContext托管对象的接口。
using System;
using System.Runtime.InteropServices;
class Program
{
static void Run()
{
// Create an int object
int obj = 1;
Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...");
// Get the IUnKnown pointer for the Integer object
IntPtr pointer = Marshal.GetIUnknownForObjectInContext(obj);
Console.WriteLine("Calling Marshal.Release...");
// Always call Marshal.Release to decrement the reference count.
Marshal.Release(pointer);
}
static void Main(string[] args)
{
Run();
}
}
Imports System.Runtime.InteropServices
Module Program
Sub Run()
' Dim an Integer object
Dim IntegerObject As Integer = 1
' Dim a pointer
Dim pointer As IntPtr
Console.WriteLine("Calling Marshal.GetIUnknownForObjectInContext...")
' Get the IUnKnown pointer for the Integer object
pointer = Marshal.GetIUnknownForObjectInContext(IntegerObject)
Console.WriteLine("Calling Marshal.Release...")
' Always call Marshal.Release to decrement the reference count.
Marshal.Release(pointer)
End Sub
Sub Main(ByVal args() As String)
Run()
End Sub
End Module
注解
此方法与在调用方与对象不在同一上下文中时返回GetIUnknownForObject的方法相同null。
