C# 接口映射

在工作中，我们主要使用Delphi，但也使用了一些C。 所以今天一所大学问了我一个有趣的问题：我如何在C语言中执行Intreface映射？因为我不知道这里有个问题要问你：

首先是Delphi示例：

unit UnitInterfaceMapping;

interface

type
  IMyFirstInterface = interface(IInterface)
    procedure DoSomethingInteresting;
    procedure DoSomethingElse;
  end;

  IMyNextInterface = interface(IInterface)
    procedure DoSomethingInteresting;
  end;

  TMyCombinedObject = class(TInterfacedObject, IMyFirstInterface, IMyNextInterface)
  private
    procedure IMyFirstInterface.DoSomethingInteresting = DoSomethingInterestingFirst;
    procedure IMyNextInterface.DoSomethingInteresting = DoSomethingInterestingNext;
  public
    procedure DoSomethingInterestingFirst;
    procedure DoSomethingInterestingNext;
    procedure DoSomethingElse;
  end;

implementation

uses
  VCL.Dialogs;
{ TMyCombinedObject }

procedure TMyCombinedObject.DoSomethingElse;
begin
  ShowMessage('DoSomethingElse');
end;

procedure TMyCombinedObject.DoSomethingInterestingFirst;
begin
  ShowMessage('DoSomethingInterestingFirst');
end;

procedure TMyCombinedObject.DoSomethingInterestingNext;
begin
  ShowMessage('DoSomethingInterestingNext');
end;

end.

形式我称之为代码的形式：

uses
  UnitInterfaceMapping;

procedure TForm14.Button1Click(Sender: TObject);
var
  MyFirstInterface: IMyFirstInterface;
  MyNextInterface: IMyNextInterface;
begin
  MyFirstInterface := TMyCombinedObject.Create;
  MyFirstInterface.DoSomethingInteresting;
  MyFirstInterface.DoSomethingElse;

  MyNextInterface := TMyCombinedObject.Create;
  MyNextInterface.DoSomethingInteresting;
end;

结果是三个对话框，每个方法一个

然后我尝试将其移植到C：

using System;

namespace InterfaceMapping
{

    public interface IMyFirstInterface
    {
        void DoSomethingInteresting();
        void DoSomethingElse();
    }


    public interface IMyNextInterface
    {
        void DoSomethingInteresting();
    }

    public class CombinedObject : IMyFirstInterface, IMyNextInterface
    {
        public void DoSomethingInteresting()
        {
            throw new NotImplementedException();
        }

        void IMyFirstInterface.DoSomethingElse()
        {
            throw new NotImplementedException();
        }

        void IMyFirstInterface.DoSomethingInteresting()
        {
            throw new NotImplementedException();
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            new CombinedObject() <== Problem
        }
    }
}

主要的一点是，在创建CombinedObject的新实例时，我只看到DoSomethingInteresting方法

---

简而言之：如何在C中执行接口映射为了从IMyFirstInterface接口访问方法，您需要显式定义对象的类型：

IMyFirstInterface obj = new CombinedObject();
obj.DoSomethingInteresting(); //Method is accessible

另一方面，如果实例化CombinedObject类型的对象，则上面的行将调用void IMyFirstInterface.DoSomethingInteresting方法：

---

将调用隐式实现接口的方法：public void DoSomethingInteresting

IMyFirstInterface obj=new CombinedObject；两种方法都可以。这里的问题是你有显式的接口实现。你应该看看隐式和显式的接口实现。这个问题可能对您有所帮助。谢谢您的回答：@JensBorrisholt欢迎您：

var obj = new CombinedObject();
obj.DoSomethingInteresting();