C#数组排序的两种常用方法

#region Array数组排序1
public class Pigeon : IComparable<Pigeon>
//类元素本身继承比较接口
{
int XValue;
int YValue;
public string BatchNo { get; set; }
public int CompareTo(Pigeon other)
{
  if (other == null)
 throw new ArgumentNullException("比较参数为空");
  //按第三个字符比较
  XValue = Convert.ToInt32(this.BatchNo.Substring(2, 1));
  YValue = Convert.ToInt32(other.BatchNo.Substring(2, 1));
  if (XValue == YValue)
  {
 return 0;
  }
  else if (XValue < YValue)
  {
 return -1;   //返回-1,X排在Y的前面
  }
  else
  {
 return 1;    //返回1,X排在Y的后面
  }
}
}
#endregion

#region 测试Array数组排序1
private void button3_Click(object sender, EventArgs e)
{
  Pigeon[] pigeons = new Pigeon[]{
 new Pigeon(){BatchNo="1256"},
 new Pigeon(){BatchNo="1236"},
 new Pigeon(){BatchNo="1276"},
 new Pigeon(){BatchNo="1216"}
  };
  Array.Sort(pigeons);
  string ResultMsg = "";
  foreach (Pigeon o in pigeons)
  {
 ResultMsg += o.BatchNo + "\r\n";
  }
  MessageBox.Show(ResultMsg);
}
#endregion

#region Array数组排序
public class MyBatch   //数组元素类
{
public string BatchNo { get; set; }
}
public enum CompareType   //比较类型枚举
{
ThreeChar =0,
FourChar=1
}
public class MyBatchCompare:IComparer<MyBatch>
//定义了一个比较类
{
private CompareType compareType;//定义排序类型
public MyBatchCompare(CompareType compareType)
{
  //构造函数中初始化比较类型
  this.compareType = compareType;
}
public int Compare(MyBatch x, MyBatch y)
{
  int XValue;
  int YValue;
  if (x == null) throw new ArgumentNullException("x值为空");
  if (y == null) throw new ArgumentNullException("y值为空");
  switch (compareType)
  {          
 case CompareType.ThreeChar:
   //按第三个字符比较从小到大排序
   XValue = Convert.ToInt32(x.BatchNo.Substring(2,1));
   YValue = Convert.ToInt32(y.BatchNo.Substring(2,1));
   if (XValue == YValue)
   {
 return 0;
   }
   else if (XValue < YValue)
   {
 return -1;   //返回-1,X排在Y的前面
   }
   else
   {
 return 1;    //返回1,X排在Y的后面
   }
 case CompareType.FourChar:
   //按第四个字符比较从小到大排序
   XValue = Convert.ToInt32(x.BatchNo.Substring(3,1));
   YValue = Convert.ToInt32(y.BatchNo.Substring(3,1));
   if (XValue == YValue)
   {
 return 0;
   }
   else if (XValue < YValue)
   {
 return -1;   //返回-1,X排在Y的前面
   }
   else
   {
 return 1;    //返回1,X排在Y的后面
   }
 default:
   throw new ArgumentException("比较类型参数错误");
  }
}
}
#endregion

#region Array数组排序
private void button2_Click(object sender, EventArgs e)
{
  MyBatch[] batchs ={
   new MyBatch(){BatchNo="1234"},
   new MyBatch(){BatchNo="1263"},
   new MyBatch(){BatchNo="1218"},
   new MyBatch(){BatchNo="1242"}
    };
  //按第三个字符从小到大排
  Array.Sort(batchs,new MyBatchCompare(CompareType.ThreeChar));
  string ResultMsg = "";
  foreach (MyBatch o in batchs)
  {
 ResultMsg += o.BatchNo + "\r\n";
  }
  MessageBox.Show(ResultMsg);
  //按第四个字符从小到大排序
  Array.Sort(batchs, new MyBatchCompare(CompareType.FourChar));
  ResultMsg = "";
  foreach (MyBatch o in batchs)
  {
 ResultMsg += o.BatchNo + "\r\n";
  }
  MessageBox.Show(ResultMsg);
}
#endregion