C#代码简化查询:顺序Foreach循环

另一种选择:

List> actions = new List> { 
    doStuff1, doStuff2, doStuff3, doStuff4, doStuff5
};

foreach (Action action in actions)
{
    foreach (Foo x in list)
    {
        action(x);
    }
}

刚检查,这是有效的.例如:

using System;
using System.Collections.Generic;

public class Test
{
    static void Main(string[] args)
    {
        var actions = new List> {
            First, Second
        };

        foreach (var action in actions)
        {
            foreach (string arg in args)
            {
                action(arg);
            }
        }
    }

    static void First(string x)
    {
        Console.WriteLine("First: " + x);
    }

    static void Second(string x)
    {
        Console.WriteLine("Second: " + x);
    }
}

跑步的结果 Test.exe a b c

First: a
First: b
First: c
Second: a
Second: b
Second: c

如果你有一个相当常量的动作列表,你可以避免使用foreach循环,但仍然显式地执行动作(尚未测试代码):

list.ForEach(action1);
list.ForEach(action2);
list.ForEach(action3);
list.ForEach(action4);

Jon Skeet的答案很棒(我刚刚投了票).这是一个进一步发展的想法:

如果你做了很多,你可以制作一个名为"DoActionsInOrder"的扩展方法(或者你可以想出一个更好的名字).这是个主意:

public static void DoActionsInOrder(this IEnumerable stream, params Action actionList)
{
     foreach(var action in actionList)
     {
          foreach(var item in stream)
          {
               action(item);
          }
     }
}

然后,你可以像这样调用它:

myList.DoActionsInOrder(doStuff1, doStuff2, doStuff3, doStuff4, doStuff5);