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在C/C++下合法的语句：

  int test = 1;

  if (test != 0)

  {

       char test = 'a';

  }

却不能在C#下编译，得到CS0136的错误： A local variable named 'test' cannot be declared in this scope because it would give a different meaning to 'test', which is already used in a 'parent or current' scope to denote something else,

在C#规范8.5.1之中对此作了明确的规定：Within the scope of a local variable, it is a compile-time error to declare another local variable or constant with the same name.                    

所以C#对局部变量的声明更严格。而之所以有这样的规定，我想主要目的是防止编程的无意之中的错误。