动态构建OrderBy的Lambda表达式

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01.public class Employee  
02.    {  
03.        public int ID { get; set; }  
04.        public string Name { get; set; }  
05.        public decimal Pay { get; set; }  
06.        public float  Height { get; set; }  
07.    } 
public class Employee
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public decimal Pay { get; set; }
        public float  Height { get; set; }
    }

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01.class Program  
02.    {  
03.        static void Main(string[] args)  
04.        {              
05. 
06.            IList<Employee> list = new List<Employee>();  
07. 
08.            list.Add(new Employee() { ID = 2, Name = "D", Height = 175.50f, Pay = 6000.45m });  
09.            list.Add(new Employee() { ID = 4, Name = "A", Height = 178.00f, Pay = 4500.8m });  
10.            list.Add(new Employee() { ID = 5, Name = "C", Height = 173.54f, Pay = 7500.11m });  
11.            list.Add(new Employee() { ID = 1, Name = "B", Height = 180.15f, Pay = 8000.2m });  
12.            list.Add(new Employee() { ID = 3, Name = "E", Height = 182.3f, Pay = 5500.70m });  
13. 
14.            Console.WriteLine("输出List （ID排序前）");  
15. 
16.            StringBuilder builder = new StringBuilder();  
17. 
18.            foreach (var i in list)  
19.            {  
20.                builder.AppendFormat("{0},", i.ID);                  
21.            }  
22. 
23.            Console.WriteLine(builder.ToString().TrimEnd(','));  
24.            Console.WriteLine("");  
25. 
26.            Console.WriteLine("输出List （ID排序后）");  
27. 
28.            list = IListOrderBy<Employee>(list, "ID");  
29. 
30.            builder.Length = 0;  
31. 
32.            foreach (var i in list)  
33.            {  
34.                builder.AppendFormat("{0},", i.ID);  
35.            }  
36. 
37.            Console.WriteLine(builder.ToString().TrimEnd(','));  
38.            Console.WriteLine("");  
39. 
40. 
41.            Console.WriteLine("输出List （Name排序前）");  
42. 
43.            builder.Length = 0;  
44. 
45.            foreach (var i in list)  
46.            {  
47.                builder.AppendFormat("{0},", i.Name);  
48.            }  
49. 
50.            Console.WriteLine(builder.ToString().TrimEnd(','));  
51.            Console.WriteLine("");  
52. 
53.            Console.WriteLine("输出List （Name排序后）");  
54. 
55.            list = IListOrderBy<Employee>(list, "Name");  
56. 
57.            builder.Length = 0;  
58. 
59.            foreach (var i in list)  
60.            {  
61.                builder.AppendFormat("{0},", i.Name);  
62.            }  
63. 
64.            Console.WriteLine(builder.ToString().TrimEnd(','));  
65.            Console.WriteLine("");  
66. 
67.            var tempList = IListOrderBy<Employee>(list, "Height");  
68. 
69.            Console.WriteLine("输出List （Height排序前）\t\t输出List （Height排序后）");  
70. 
71.            for (int i = 0, len = list.Count; i < len; i++)  
72.            {  
73.                Console.WriteLine("\t{0}\t\t\t\t\t{1}", list[i].Height, tempList[i].Height);  
74.            }  
75. 
76.            Console.WriteLine("");  
77. 
78.            tempList = IListOrderBy<Employee>(list, "Pay");  
79. 
80.            Console.WriteLine("输出List （Pay排序前）\t\t输出List （Pay排序后）");  
81. 
82.            for (int i = 0, len = list.Count; i < len; i++)  
83.            {  
84.                Console.WriteLine("\t{0}\t\t\t\t{1}", list[i].Pay, tempList[i].Pay);  
85.            }  
86.} 
class Program
    {
        static void Main(string[] args)
        {           

            IList<Employee> list = new List<Employee>();

            list.Add(new Employee() { ID = 2, Name = "D", Height = 175.50f, Pay = 6000.45m });
            list.Add(new Employee() { ID = 4, Name = "A", Height = 178.00f, Pay = 4500.8m });
            list.Add(new Employee() { ID = 5, Name = "C", Height = 173.54f, Pay = 7500.11m });
            list.Add(new Employee() { ID = 1, Name = "B", Height = 180.15f, Pay = 8000.2m });
            list.Add(new Employee() { ID = 3, Name = "E", Height = 182.3f, Pay = 5500.70m });

            Console.WriteLine("输出List （ID排序前）");

            StringBuilder builder = new StringBuilder();

            foreach (var i in list)
            {
                builder.AppendFormat("{0},", i.ID);               
            }

            Console.WriteLine(builder.ToString().TrimEnd(','));
            Console.WriteLine("");

            Console.WriteLine("输出List （ID排序后）");

            list = IListOrderBy<Employee>(list, "ID");

            builder.Length = 0;

            foreach (var i in list)
            {
                builder.AppendFormat("{0},", i.ID);
            }

            Console.WriteLine(builder.ToString().TrimEnd(','));
            Console.WriteLine("");

            Console.WriteLine("输出List （Name排序前）");

            builder.Length = 0;

            foreach (var i in list)
            {
                builder.AppendFormat("{0},", i.Name);
            }

            Console.WriteLine(builder.ToString().TrimEnd(','));
            Console.WriteLine("");

            Console.WriteLine("输出List （Name排序后）");

            list = IListOrderBy<Employee>(list, "Name");

            builder.Length = 0;

            foreach (var i in list)
            {
                builder.AppendFormat("{0},", i.Name);
            }

            Console.WriteLine(builder.ToString().TrimEnd(','));
            Console.WriteLine("");

            var tempList = IListOrderBy<Employee>(list, "Height");

            Console.WriteLine("输出List （Height排序前）\t\t输出List （Height排序后）");

            for (int i = 0, len = list.Count; i < len; i++)
            {
                Console.WriteLine("\t{0}\t\t\t\t\t{1}", list[i].Height, tempList[i].Height);
            }

            Console.WriteLine("");

            tempList = IListOrderBy<Employee>(list, "Pay");

            Console.WriteLine("输出List （Pay排序前）\t\t输出List （Pay排序后）");

            for (int i = 0, len = list.Count; i < len; i++)
            {
                Console.WriteLine("\t{0}\t\t\t\t{1}", list[i].Pay, tempList[i].Pay);
            }
}

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