时间：2020-11-02 16:59:02 | 栏目：.NET代码 | 点击：次
一、
二、
三、代码例子
1.新建 PointClass.cs
namespace StructAndClass
{
internal class PointClass
{
public PointClass(int x, int y)
{
X = x;
Y = y;
}
public int X { get; set; }
public int Y { get; set; }
}
}
2.新建 PointStruct.cs
namespace StructAndClass
{
internal struct PointStruct
{
public int X { get; set; }
public int Y { get; set; }
public PointStruct(int x, int y)
{
X = x;
Y = y;
}
}
}
3.Program.cs
using System;
namespace StructAndClass
{
internal class Program
{
private static void Main(string[] args)
{
Console.WriteLine("PointStruct =====");
var pStruct = new PointStruct(10, 10);
Console.WriteLine("初始值：x={0}，y={1}", pStruct.X, pStruct.Y);
ModifyPointStruct(pStruct);
Console.WriteLine("调用 ModifyPointStruct() 后的值：x={0}，y={1}", pStruct.X, pStruct.Y);
Console.WriteLine();
Console.WriteLine("PointClass =====");
var pClass = new PointClass(10, 10);
Console.WriteLine("初始值：x={0}，y={1}", pClass.X, pClass.Y);
ModifyPointClass(pClass);
Console.WriteLine("调用 ModifyPointClass() 后的值：x={0}，y={1}", pClass.X, pClass.Y);
Console.Read();
}
private static void ModifyPointStruct(PointStruct point)
{
Console.WriteLine("调用方法：ModifyPointStruct");
point.X = 20;
point.Y = 20;
Console.WriteLine("修改成的值：x={0}, y={1}", point.X, point.Y);
}
private static void ModifyPointClass(PointClass point)
{
Console.WriteLine("调用方法：ModifyPointClass");
point.X = 20;
point.Y = 20;
Console.WriteLine("修改成的值：x={0}, y={1}", point.X, point.Y);
}
}
}
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；
至于类，传递的是内存地址的引用，修改的就是初始值