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102 lines
2.6 KiB
C#

using Study.DelegateSeries.Core.Calculator;
using System;
namespace Study.DelegateSeries.Core
{
/// <summary>
/// 委托学习
/// 使用:定义委托、实例化委托、调用委托
/// </summary>
public class StudyDelegate
{
/*
* 委托系列学习
* 1、委托概念
* 2、定义与使用委托
* 3、多播委托
* 4、使用匿名方法
* 5、使用Lamda表达式
* 6、委托使用场景
* 7、委托与事件
* 8、委托与接口
* 9、其它
* 10、总结
*/
#region 定义委托,DeclareDelegate类
#endregion
#region 实例化委托
/// <summary>
/// 基础语法
/// (c#1.0 开始提供)
/// </summary>
public CalculatorDelegate BaseInstance()
{
CalculatorDelegate operation = new CalculatorDelegate(new Addition().Add);
return operation;
}
/// <summary>
/// c#2.0 简写方法
/// (基于类型推断)
/// </summary>
public CalculatorDelegate AutoTypeInstance()
{
CalculatorDelegate operation = new Subtraction().Difference;
return operation;
}
/// <summary>
/// c#2.0 匿名委托
/// (使用匿名方法实例化的委托)
/// </summary>
public CalculatorDelegate AnonymousInstance()
{
//c# 2.0基础语法
CalculatorDelegate operation = delegate (decimal a,decimal b) { return (a * b) * (a * b); };
return operation;
}
/// <summary>
/// c#3.0 Lambda表达式
/// (实质:"Lambda表达式"是一个匿名函数)
/// </summary>
public CalculatorDelegate LambdaInstance()
{
CalculatorDelegate operation = (decimal a,decimal b)=> { return a * a + b * b + 2 * a * b; };
//自动推断
CalculatorDelegate operation2 = (a,b) => { return a * a + b * b + 2 * a * b; };
//{}只有一句时的简写
CalculatorDelegate operation3 = (a, b) => a * a + b * b + 2 * a * b ;
return operation;
}
#endregion
#region 调用委托
#endregion
#region 闭包
#endregion
#region 多播委托
#endregion
#region 泛型委托
#endregion
#region 内置委托
#endregion
#region 委托与事件
#endregion
#region 委托与接口
#endregion
}
}