在C#中，如果有一个方法我们不想继续使用，需要废弃的时候，可以在该方法前面加上一个[Obsolete]。例如：[Obsolete]
public double GetArea()
{
switch (_arg)
{
case CIRCLE:
return _size * _size;
case SQUARE:
return _size * _size;
case RIGHT_TRIANGLE:
return _size * _size / 2;
default:
return 0;
}
}
这时候，如果还有程序使用该方法，编译时会报如下警告信息：GetArea()方法已过时。
From Terrylee's cnblogs!

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