使用属性在类的成员函数之前执行某些特定代码？

I have a class:

我上课了:

public class MyClass
{
  public int code { set; get; }
  public bool foo()
  {
    // do some stuff
    // ...
    code = 100;
    return true;
  }

  public bool bar()
  {
    // do some stuff
    // ...
    code = 200;
    return true;
  }

  // more methods ...
  // ...
}
public class MyClass