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; }
 }
}

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;
 }
 }
}

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);
 }
 }
}