转载：http://blog.csdn.net/seattle1215/article/details/6657814

1. using System;  
2. using System.Collections.Generic;  
3. using System.Linq;  
4. using System.Text;  
5.   
6. namespace Cash  
7. {  
8.     class Program  
9.     {  
10.         static void Main(string[] args)  
11.         {  
12.             (new Program()).run();  
13.   
14.             // writeFee(calculate(dailyRate, workDay));        
15.             // 对于非 static 方法，若想像上面这样直接调用则会报以下错  
16.             // Error    1 An object reference is required  
17.             // for the non-static field, method, or   
18.             // property ‘Cash.Program.readDouble(string)‘  
19.                           
20.             printfOtherthing("static method is called.");        // static 方法可直接调用  
21.             Program program = new Program();        // 非 static 方法需要先创建一个对象  
22.                                                     // 然后用对象调用  
23.             program.printSomething("non-static menthod is called.");  
24.         }  
25.   
26.         public void run()  
27.         {  
28.             double dailyRate = readDouble("please enter your rate: ");  
29.             int workDay = readInt("please enter your days of working: ");  
30.             writeFee(calculate(dailyRate, workDay));  
31.         }  
32.   
33.         private void writeFee(double p)  
34.         {  
35.             Console.WriteLine("The consultant‘s fee is: {0}", p * 1.6);  
36.         }  
37.   
38.         private double calculate(double dailyRate, int workDay)  
39.         {  
40.             return dailyRate * workDay;  
41.         }  
42.   
43.         private int readInt(string p)  
44.         {  
45.             Console.WriteLine(p);  
46.             string a = Console.ReadLine();          // 读取输入的字符（readline读取的  
47.                                                     // 字符都是 string 类型）  
48.             return int.Parse(a);                    // 把 a 转换为 int 类型，并返回  
49.         }  
50.   
51.         private double readDouble(string p)  
52.         {  
53.             Console.WriteLine(p);  
54.             string line = Console.ReadLine();  
55.             return double.Parse(line);  
56.         }  
57.   
58.         private void printSomething(string a)       // non-static method  
59.         {  
60.             Console.WriteLine(a);  
61.         }  
62.   
63.         private static void printfOtherthing(string a)          // static method  
64.         {  
65.             Console.WriteLine(a);  
66.         }  
67.     }  
68. }