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基本思想每个case的选择值作为键，处理过程做成函数委托存放进数据字典。用的时候根据之调用。下面上代码
封装的FuncSwitcher类
using System;
using System.Collections.Generic;
namespace Test
{
class FuncSwitcher<T>
{
int count;
Dictionary<T, Delegate> FuncGather;
Delegate defalutFunc;
public FuncSwitcher()
{
count = 0;
FuncGather = new Dictionary<T, Delegate>();
}
/// <summary>
/// 调用函数处理
/// </summary>
/// <param name="t"></param>
/// <param name="parameters"></param>
/// <returns></returns>
public object Invoke(T t, object[] parameters)
{
if (FuncGather.ContainsKey(t))
{
var method = FuncGather[t];
return method.Method.Invoke(method, parameters);
}
else
{
var method = defalutFunc;
return method.Method.Invoke(method, null);
}
}
/// <summary>
/// 添加默认处理函数
/// </summary>
/// <param name="defaultFunc"></param>
public void AddDefault(Delegate defaultFunc)
{
this.defalutFunc = defaultFunc;
}
/// <summary>
/// 添加键值对
/// </summary>
/// <param name="key"></param>
/// <param name="func"></param>
public void AddFunc(T key, Delegate func)
{
FuncGather.Add(key, func);
}
/// <summary>
/// 添加多对键值
/// </summary>
/// <param name="funcs"></param>
public void AddRange(KeyValuePair<T, Delegate>[] funcs)
{
foreach (KeyValuePair<T, Delegate> func in funcs)
{
FuncGather.Add(func.Key, func.Value);
}
}
/// <summary>
/// 移除键值对
/// </summary>
/// <param name="t"></param>
public void Remove(T t)
{
FuncGather.Remove(t);
}
/// <summary>
/// 获取函数
/// </summary>
/// <param name="t"></param>
/// <returns></returns>
public Delegate GetFunc(T t)
{
return FuncGather[t];
}
/// <summary>
/// 是否包含键
/// </summary>
/// <param name="t"></param>
/// <returns></returns>
public bool ContainKey(T t)
{
if (FuncGather.ContainsKey(t))
return true;
else
return false;
}
/// <summary>
/// 是否包含值
/// </summary>
/// <param name="t"></param>
/// <returns></returns>
public bool ContainValue(Delegate t)
{
if (FuncGather.ContainsValue(t))
return true;
else
return false;
}
/// <summary>
/// 清空键值
/// </summary>
public void Clear()
{
FuncGather.Clear();
count = 0;
}
public int Count
{
get { return count; }
}
}
}
测试用的函数，我最偏好的加减乘除，用什么其实都无所谓。
using System;
using System.Collections.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Configuration;
using System.Diagnostics;
namespace Test
{
class Program
{
static void Main(string[] args)
{
FuncSwitcher<ConsoleKey> Switcher = new FuncSwitcher<ConsoleKey>();
ConsoleKeyInfo flag;
Switcher.AddFunc(ConsoleKey.D0, new Action(() => { SwitchTest(); }));
Switcher.AddFunc(ConsoleKey.D1, new Action(() => { CustomSwitchTest(); }));
Switcher.AddFunc(ConsoleKey.D2, new Action(() => { Console.WriteLine("程序已经退出"); Environment.Exit(0); }));
Switcher.AddDefault(new Action(() => { Console.WriteLine("重新输入"); }));
while (true)
{
Console.WriteLine("********************************");
Console.WriteLine("***** 0：switch测试 ******");
Console.WriteLine("***** 1: CustomSwitchTest******");
Console.WriteLine("***** 2: 退出程序 ******");
Console.WriteLine("********************************");
flag = Console.ReadKey();
Console.WriteLine();
Switcher.Invoke(flag.Key, null);
}
}
/// <summary>
/// switch/case
/// </summary>
public static void SwitchTest()
{
Console.WriteLine("********************");
Console.WriteLine("***** add：加 ****");
Console.WriteLine("***** sub: 减 ****");
Console.WriteLine("***** mul: 乘 ****");
Console.WriteLine("***** div: 除 ****");
Console.WriteLine("***** 0：返回 ****");
Console.WriteLine("********************");
Console.WriteLine("输入操作");
string operate = Console.ReadLine();
switch (operate)
{
case "add":
Console.WriteLine(Add(1, 1));
break;
case "sub":
Console.WriteLine(Sub(1, 1));
break;
case "mul":
Console.WriteLine(Mul(1, 1));
break;
case "div":
Console.WriteLine(Div(1, 1));
break;
default:
Console.WriteLine("重新输入");
break;
}
}
/// <summary>
/// 自定义的选择
/// </summary>
public static void CustomSwitchTest()
{
FuncSwitcher<string> switcher = new FuncSwitcher<string>();
switcher.AddDefault(new Action(() => { Console.WriteLine("重新输入"); }));
switcher.AddRange(new KeyValuePair<string, Delegate>[]
{
new KeyValuePair<string,Delegate>("add", new Func<int,int,int>(Add)),
new KeyValuePair<string,Delegate>("sub", new Func<int,int,int>(Sub)),
new KeyValuePair<string,Delegate>("mul", new Func<int,int,int>(Mul)),
new KeyValuePair<string, Delegate>("div", new Func<int, int, int>(Div)),
});
Console.WriteLine("********************");
Console.WriteLine("***** add：加 ****");
Console.WriteLine("***** sub: 减 ****");
Console.WriteLine("***** mul: 乘 ****");
Console.WriteLine("***** div: 除 ****");
Console.WriteLine("***** 0：返回 ****");
Console.WriteLine("********************");
Console.WriteLine("输入操作");
string operate = Console.ReadLine();
Console.WriteLine(switcher.Invoke(operate, new object[] { 1, 1 }));
}
/// <summary>
/// 测试所用，无所谓了，什么函数都可以的
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
public static int Add(int x, int y)
{
return x + y;
}
public static int Sub(int x, int y)
{
return x - y;
}
public static int Mul(int x, int y)
{
return x * y;
}
public static int Div(int x, int y)
{
if (y != 0)
return x / y;
else throw new DivideByZeroException("除数不可以为0");
}
}
}
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原文地址：http://my.oschina.net/hunjixin/blog/505665
