类接口/Class Interface

àì夳堔傛蜴生んèń 2021-11-02 03:02 376阅读 0赞

在查看Object类的定义时发现Object使用了**ClassInterface，而且是[ClassInterfaceType][].[AutoDual][]**故查看一下具体什么，原来是类接口是为互操作而设计的,其中写到托管代码中基类或接口的中顺序也会影响互操作,真是不应乱该动代码。:)

**类接口**是未在托管代码中显式定义的接口，它将公开在 .NET 对象上显式公开的所有公共方法、属性、字段和事件。此接口可以是双绑定接口，也可以是仅调度接口。类接口将接收 .NET 类本身的名称，并在名称前加有下划线。例如，对于 Mammal 类，类接口为 \_Mammal。

对于派生类，类接口还会公开基类的所有公共方法、属性和字段。派生类也会为每个基类公开一个类接口。例如，如果 Mammal 类扩展 MammalSuperclass 类，而 MammalSuperclass 本身又扩展 System.Object，.NET 对象将向 COM 客户端公开三个名为 \_Mammal、\_MammalSuperclass 和 \_Object 的接口。

[http://msdn.microsoft.com/zh-cn/library/4fcadw4a.aspx][http_msdn.microsoft.com_zh-cn_library_4fcadw4a.aspx]

ClassInterfaceAttribute 类:[http://msdn.microsoft.com/zh-cn/library/system.runtime.interopservices.classinterfaceattribute.aspx][http_msdn.microsoft.com_zh-cn_library_system.runtime.interopservices.classinterfaceattribute.aspx]

其中写到：

**限制将双绑定接口选项用于类接口。**

双绑定接口支持 COM 客户端对接口成员进行早期和后期绑定。在设计时和测试期间，您可能会发现将类接口设置为双绑定非常有用。对于从不会修改的托管类（及其基类），此选项也是可以接受的。在其他所有情况下，应避免将类接口设置为双绑定。

自动生成的双绑定接口可能会适用于少数的情况，而在多数情况下，它会带来与版本相关的复杂性。例如，使用派生类的类接口的 COM 客户端很容易在遇到对基类的更改时中断。当第三方提供基类时，您将无法控制类接口的布局。此外，与仅调度接口不同，双绑定接口 (**ClassInterface.AutoDual**) 在导出的类型库中提供了类接口的说明。这样的说明会促使后期绑定的客户端在运行时缓存 DispId。

看来Object中public的方法非static的顺序应该是不会更改的了。

\[[Serializable][], **[ClassInterface][]([ClassInterfaceType][].[AutoDual][]),** [ComVisible][](true)\]  
public class [Object][]  
\{  
// Methods  
\[[ReliabilityContract][]([Consistency][].[WillNotCorruptState][], [Cer][].[MayFail][]), [TargetedPatchingOptOut][]("Performance critical to inline this type of method across NGen image boundaries")\]  
public [Object][Object 1]();  
\[[TargetedPatchingOptOut][]("Performance critical to inline across NGen image boundaries")\]  
public virtual [bool][] [Equals][]([object][Object] obj);  
\[[TargetedPatchingOptOut][]("Performance critical to inline across NGen image boundaries")\]  
public static [bool][] [Equals][Equals 1]([object][Object] objA, [object][Object] objB);  
\[[ReliabilityContract][]([Consistency][].[WillNotCorruptState][], [Cer][].[Success][])\]  
protected virtual [void][] [Finalize][]();  
\[[TargetedPatchingOptOut][]("Performance critical to inline across NGen image boundaries")\]  
public virtual [int][] [GetHashCode][]();  
\[[MethodImpl][]([MethodImplOptions][].[InternalCall][]), [SecuritySafeCritical][]\]  
public extern [Type][] [GetType][]();  
\[[MethodImpl][]([MethodImplOptions][].[InternalCall][]), [SecuritySafeCritical][]\]  
protected extern [object][Object] [MemberwiseClone][]();  
\[[ReliabilityContract][]([Consistency][].[WillNotCorruptState][], [Cer][].[Success][]), [TargetedPatchingOptOut][]("Performance critical to inline across NGen image boundaries")\]  
public static [bool][] [ReferenceEquals][]([object][Object] objA, [object][Object] objB);  
public virtual [string][] [ToString][]();  
\}

转载于:https://www.cnblogs.com/zzj8704/archive/2010/10/27/1862558.html

[ClassInterfaceType]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.InteropServices.ClassInterfaceType
[AutoDual]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.InteropServices.ClassInterfaceType/AutoDual
[http_msdn.microsoft.com_zh-cn_library_4fcadw4a.aspx]: http://msdn.microsoft.com/zh-cn/library/4fcadw4a.aspx
[http_msdn.microsoft.com_zh-cn_library_system.runtime.interopservices.classinterfaceattribute.aspx]: http://msdn.microsoft.com/zh-cn/library/system.runtime.interopservices.classinterfaceattribute.aspx
[Serializable]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.SerializableAttribute/.ctor%28%29
[ClassInterface]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.InteropServices.ClassInterfaceAttribute/.ctor%28System.Runtime.InteropServices.ClassInterfaceType%29
[ComVisible]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.InteropServices.ComVisibleAttribute/.ctor%28Boolean%29
[Object]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object
[ReliabilityContract]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.ConstrainedExecution.ReliabilityContractAttribute/.ctor%28System.Runtime.ConstrainedExecution.Consistency,System.Runtime.ConstrainedExecution.Cer%29
[Consistency]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.ConstrainedExecution.Consistency
[WillNotCorruptState]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.ConstrainedExecution.Consistency/WillNotCorruptState
[Cer]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.ConstrainedExecution.Cer
[MayFail]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.ConstrainedExecution.Cer/MayFail
[TargetedPatchingOptOut]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.TargetedPatchingOptOutAttribute/.ctor%28String%29
[Object 1]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/.ctor%28%29
[bool]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Boolean
[Equals]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/Equals%28Object%29:Boolean
[Equals 1]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/Equals%28Object,Object%29:Boolean
[Success]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.ConstrainedExecution.Cer/Success
[void]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Void
[Finalize]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/Finalize%28%29
[int]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Int32
[GetHashCode]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/GetHashCode%28%29:Int32
[MethodImpl]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.CompilerServices.MethodImplAttribute/.ctor%28System.Runtime.CompilerServices.MethodImplOptions%29
[MethodImplOptions]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.CompilerServices.MethodImplOptions
[InternalCall]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Runtime.CompilerServices.MethodImplOptions/InternalCall
[SecuritySafeCritical]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Security.SecuritySafeCriticalAttribute/.ctor%28%29
[Type]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Type
[GetType]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/GetType%28%29:System.Type
[MemberwiseClone]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/MemberwiseClone%28%29:Object
[ReferenceEquals]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/ReferenceEquals%28Object,Object%29:Boolean
[string]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.String
[ToString]: http://www.aisto.com/roeder/dotnet/Default.aspx?Target=code://mscorlib:4.0.0.0:b77a5c561934e089/System.Object/ToString%28%29:String