C# class A {} class B:A {} class C:B Main() { A a = new A; B b = new C; A c =b; }A c

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C# class A {} class B:A {} class C:B Main() { A a = new A; B b = new C; A c =b; }A c

C# class A {} class B:A {} class C:B Main() { A a = new A; B b = new C; A c =b; }A c
C# class A {} class B:A {} class C:B Main() { A a = new A; B b = new C; A c =b; }
A c

C# class A {} class B:A {} class C:B Main() { A a = new A; B b = new C; A c =b; }A c
声明一个A类型的对象c,他引用了B类型对象实例b.
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