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using System;
using System.Collections.Generic;
using System.Text;
//命名空间同级：调用方只需要引用定义类库就能使用；不需要使用Uing语句引入定义委托的命名空间。
public delegate string NamespaceLevelDelegate();
public delegate string ToLowerDelegate(string source);
namespace Study.DelegateSeries.Core
{
//类同级：最常用和推荐的，可见范围与使用方法与类相同。
public delegate string ClassLevelDelegate();
public class DeclareDelegateDemo
//类内部方法同级：可见范围与使用方法与类中方法相似，调用方须先调用类，后再调用委托。
public delegate string MethodLevelDelegate();
public string GetClassName()
//方法体内：不允许定义委托
return "DeclareDelegateDemo";
}