请问一下,下面这个代码错误在哪里?
类A里的功能都不能用,是不是传值不成功啊!
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
namespace shuzu
{
  class A
  {
  public int[] p=new int[5];
  public void paixu(int[] arr)//排序功能
  {
  for (int i = 0; i < p.Length; i++)
  {
  for (int j = i + 1; j < p.Length; j++)
  if (p[i] > p[j])
  {
  int t = p[i];
  p[i] = p[j];
  p[j] = t;
  }
  Console.WriteLine("{0}", p[i]);
  }
  }
  public void chazhao(int[] arr)//查找功能
  {
  string t = Console.ReadLine();
  int L = Convert.ToInt32(t);
  int i = 0;
  int j = p.Length;
  while (L < (i + j) / 2)
  {
  j = (j + i) / 2 - 1;
  }
  while (L > (i + j) / 2)
  {
  i = (j + i) / 2 + 1;
  }
  if (i > j)
  Console.WriteLine("没有这个元素");
  else
  Console.WriteLine("{0}", (i + j) / 2);
  }
  public void qiuhe(int[] arr)//求和
  {
  int mux=0;
  for(int i=0;i<p.Length;i++)
  mux +=p[i];
  Console.WriteLine("{0}", mux);
  }

  }
  class Program
  {
  public static void Main()
  {
  string[] str = new string[5];
  int[] arr = new int[5];
  for (int i = 0; i < 5; i++)
  {
  str[i] = Console.ReadLine();
  arr[i] = Convert.ToInt32(str[i]);
  }
  A sz = new A();
  Console.WriteLine(" 1=paixu 2=chazhao 3=qiuhe");
  Console.Write("Please enter your selection: ");

  sz.paixu(arr);

  sz.chazhao(arr);

  sz.qiuhe(arr);

  Console.ReadLine();
  }
 
  }
}


------解决方案--------------------
public void paixu(int[] arr)//排序功能 
{ 
for (int i = 0; i < p.Length; i++) 
{ 
for (int j = i + 1; j < p.Length; j++) 
if (p[i] > p[j]) 
{ 
int t = p[i]; 
p[i] = p[j]; 
p[j] = t; 
} 
Console.WriteLine("{0}", p[i]); 
} 
} 
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你传的是arr,结果代码里面用的是数组p