关于Property赋值

赋值1：

View Code

 1 using System;
 2 
 3 class ComplexNumber
 4 {
 5      public double Real { get; set; }
 6      public double Imaginary { get; set; }
 7  
 8      public override string ToString()
 9      {
10           return String.Format("{0}{1}{2}i", 
11               Real, 
12               Imaginary >= 0 ? "+" : "-", 
13               Math.Abs(Imaginary));
14       }
15 }
16 
17 class CompareComplexNumbers
18 {
19      public static void Main()
20      {
21           ComplexNumber a = new ComplexNumber() //初始化赋值
22               { Real = 4.5D, Imaginary = 8.4D };
23           ComplexNumber b = new ComplexNumber() 
24               { Real = 6.3D, Imaginary = -2.3D };
25           ComplexNumber c = new ComplexNumber() 
26               { Real = 4.5D, Imaginary = 8.4D };
27   
28           Console.WriteLine("{0} equals {1}: {2}", 
29               a, b, CompareTwoComplexNumbers(a, b));
30           Console.WriteLine("{0} equals {1}: {2}", 
31               b, c, CompareTwoComplexNumbers(b, c));
32           Console.WriteLine("{0} equals {1}: {2}", 
33               a, c, CompareTwoComplexNumbers(a, c));
34       }
35  
36      static bool CompareTwoComplexNumbers(ComplexNumber A, ComplexNumber B)
37      {
38           // This returns true only if the real parts and the imaginary parts are equal
39           return ((A.Real == B.Real) && (A.Imaginary == B.Imaginary));
40       }
41 }

赋值2：property的setter为private屏蔽外界，赋值可通过constructer，property的setter没有写代表只读，所以赋值需要从filed

View Code

 1 /// <summary>
 2 /// A guy with a name, age and a wallet full of bucks
 3 /// </summary>
 4 class Guy
 5 {
 6      /// <summary>
 7      /// Read-only backing field for the Name property
 8      /// </summary>
 9      private readonly string name;
10  
11      /// <summary>
12      /// The name of the guy
13      /// </summary>
14      public string Name { get { return name; } }
15  
16      /// <summary>
17      /// Read-only backing field for the Name property
18      /// </summary>
19      private readonly int age;
20  
21      /// <summary>
22      /// The guy's age
23      /// </summary>
24      public int Age { get { return age; } }
25  
26      /// <summary>
27      /// The number of bucks the guy has
28      /// </summary>
29      public int Cash { get; private set; }
30  
31      /// <summary>
32      /// The constructor sets the name, age and cash
33      /// </summary>
34      /// <param name="name">The name of the guy</param>
35      /// <param name="age">The guy's age</param>
36      /// <param name="cash">The amount of cash the guy starts with</param>
37      public Guy(string name, int age, int cash) {
38           this.name = name;
39           this.age = age;
40           Cash = cash;
41       }
42  
43      public override string ToString() {
44           return String.Format("{0} is {1} years old and has {2} bucks", Name, Age, Cash);
45       }
46  
47      /// <summary>
48      /// Give cash from my wallet
49      /// </summary>
50      /// <param name="amount">The amount of cash to give</param>
51      /// <returns>The amount of cash I gave, or 0 if I don't have enough cash</returns>
52      public int GiveCash(int amount) {
53           if (amount <= Cash && amount > 0)
54           {
55                Cash -= amount;
56                return amount;
57            }
58           else
59           {
60                return 0;
61            }
62       }
63  
64      /// <summary>
65      /// Receive some cash into my wallet
66      /// </summary>
67      /// <param name="amount">Amount to receive</param>
68      /// <returns>The amount of cash received, or 0 if no cash was received</returns>
69      public int ReceiveCash(int amount) {
70           if (amount > 0)
71           {
72                if (amount > 0)
73                {
74                     Cash += amount;
75                     return amount;
76                 }
77                Console.WriteLine("{0} says: {1} isn't an amount I'll take", Name, amount);
78            }
79           return 0;
80       }
81 }