C# Func<T,TResult>

    using System;

    namespace FuncDemo
    {
        internal class Program
        {
            private static void Main()
            {
                //类似委托功能  
                Func<InputArgs, Result> func = TsetFunction;

　　　　　　　　　　System.Diagnostics.Debug.WriteLine("第一种方式：");

　　　　　　　　　　System.Diagnostics.Debug.WriteLine(func(new InputArgs("zhangqs008", "123456")));
　　　　　　　　　　System.Diagnostics.Debug.WriteLine("=============================================");
　　　　　　　　　　System.Diagnostics.Debug.WriteLine("第二种方式：");

                CallMethod(func, new InputArgs("zhangqs008", "1234567")); //或者   
                CallMethod(TsetFunction, new InputArgs("zhangqs008", "1234567"));

                Console.Read();
            }


            public static Result TsetFunction(InputArgs input)
            {
                Result result = new Result();
                result.Flag = String.Compare("zhangqs008", input.UserName, StringComparison.OrdinalIgnoreCase) == 0 &
                    String.Compare("123456", input.Password, StringComparison.OrdinalIgnoreCase) == 0;
                result.Msg = "当前调用者：" + input.UserName;
                return result;
            }

            public static void CallMethod<T>(Func<T, Result> func, T item)
            {
                Result result = func(item);
                System.Diagnostics.Debug.WriteLine(result.ToString());
            }
            /// <summary>  
            /// 方法参数  
            /// </summary>  
            public class InputArgs
            {
                public InputArgs(string userName, string password)
                {
                    UserName = userName;
                    Password = password;
                }

                public string UserName { get; set; }
                public string Password { get; set; }
            }

            /// <summary>  
            /// 方法结果  
            /// </summary>  
            public class Result
            {
                public string Msg { get; set; }
                public bool Flag { get; set; }
                public override string ToString()
                {
                    return string.Format("Flag:{0},Msg:{1}", Flag, Msg);
                }
            }

        }
    }  

http://blog.csdn.net/a497785609/article/details/8282785 

http://msdn.microsoft.com/zh-cn/library/Bb534960(v=vs.110).aspx