1 namespace StructAndClass 2 { 3 internal class PointClass 4 { 5 public PointClass(int x, int y) 6 { 7 X = x; 8 Y = y; 9 }10 11 public int X { get; set; }12 13 public int Y { get; set; }14 }15 }
2.新建 PointStruct.cs
1 namespace StructAndClass 2 { 3 internal struct PointStruct 4 { 5 public int X { get; set; } 6 7 public int Y { get; set; } 8 9 public PointStruct(int x, int y)10 {11 X = x;12 Y = y;13 }14 }15 }
3.PRogram.cs
1 using System; 2 3 namespace StructAndClass 4 { 5 internal class Program 6 { 7 private static void Main(string[] args) 8 { 9 Console.WriteLine("PointStruct =====");10 var pStruct = new PointStruct(10, 10);11 Console.WriteLine("初始值:x={0},y={1}", pStruct.X, pStruct.Y);12 ModifyPointStruct(pStruct);13 Console.WriteLine("调用 ModifyPointStruct() 后的值:x={0},y={1}", pStruct.X, pStruct.Y);14 Console.WriteLine();15 16 Console.WriteLine("PointClass =====");17 var pClass = new PointClass(10, 10);18 Console.WriteLine("初始值:x={0},y={1}", pClass.X, pClass.Y);19 ModifyPointClass(pClass);20 Console.WriteLine("调用 ModifyPointClass() 后的值:x={0},y={1}", pClass.X, pClass.Y);21 Console.Read();22 }23 24 private static void ModifyPointStruct(PointStruct point)25 {26 Console.WriteLine("调用方法:ModifyPointStruct");27 point.X = 20;28 point.Y = 20;29 Console.WriteLine("修改成的值:x={0}, y={1}", point.X, point.Y);30 }31 32 private static void ModifyPointClass(PointClass point)33 {34 Console.WriteLine("调用方法:ModifyPointClass");35 point.X = 20;36 point.Y = 20;37 Console.WriteLine("修改成的值:x={0}, y={1}", point.X, point.Y);38 }39 }40 }
4.结果:
【解析】
ModifyPointStruct(PointStruct point) 调用时修改的只是结构副本,所以原来的结构并没有发生变化;
ModifyPointClass(PointClass point) 调用时所修改的对象是原对象,因为参数传递过来的是一个引用地址,这地址指向原对象
四、总结
结构是值类型并在堆栈中传递,每次使用方法进行修改的都只是结构副本;
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