Action<T>泛型委托

描述:

封装一个方法,该方法只采用一个参数并且不返回值.

语法:

public delegate void Action<T>(T arg);

T:

参数类型:此委托封装的方法的参数类型

arg:

参数:此委托封装的方法的参数

备注:

通过此委托,可以将方法当做参数进行传递.

其他形式:

public delegate void Action<T1, T2>(T1 arg1, T2 arg2); public delegate void Action<T1, T2, T3>(T1 arg1, T2 arg2, T3 arg3); public delegate void Action<T1, T2, T3, T4>(T1 arg1, T2 arg2, T3 arg3, T4 arg4);

例子:

protected void Page_Load(object sender, EventArgs e) { List<int> list = new List<int>(); list.AddRange(new int[] { 7, 6, 10, 1, 2, 3, 4, 5, 8 }); Action<int> action = new Action<int>(AddFive); list.ForEach(action); //效果同 // Action<int> action = new Action<int>(AddFive); // list.ForEach(action); //list.ForEach(x => Response.Write((x + 5).ToString() + "<br/>")); //效果同 // Action<int> action = new Action<int>(AddFive); // list.ForEach(action); //list.ForEach(delegate(int i) //{ // HttpContext.Current.Response.Write((i + 5).ToString() + "<br/>"); //}); } public static void AddFive(int i) { HttpContext.Current.Response.Write((i + 5).ToString() + "<br/>"); }

结果:

12111567891013

转载于:https://www.cnblogs.com/oneword/archive/2010/08/31/1814020.html