html xmlns="http://www.w3.org/1999/xhtml"> 
head runat="server"> 
  title>數組刪除重復值/title> 
/head> 
body> 
  form id="form1" runat="server"> 
  div> 
    數組刪除前： 
    asp:Label ID="lblResult1" runat="server">/asp:Label> 
    br /> 
    數組刪除后： 
    asp:Label ID="lblResult2" runat="server">/asp:Label> 
  /div> 
  /form> 
/body> 
/html>

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using System.Collections; //引用 
   
public partial class NetObjects_數組_刪除重復值 : System.Web.UI.Page 
{ 
  protected void Page_Load(object sender, EventArgs e) 
  { 
    string strNum = "168,145,150,148,333,888,666,168,144"; 
    //輸出原數組 
    lblResult1.Text = strNum; 
    string[] arrNum = strNum.Split(','); 
    ArrayList al = new ArrayList(); 
    for (int i = 0; i  arrNum.Length; i++) 
    { 
      //判斷數組值是否已經存在 
      if (al.Contains(arrNum[i]) == false) 
      { 
        al.Add(arrNum[i]); 
      } 
    } 
    //把ArrayList轉換數組 
    arrNum = new string[al.Count]; 
    arrNum = (string[])al.ToArray(typeof(string)); 
    //輸出刪除后數組 
    string result = ""; 
    for (int j = 0; j  arrNum.Length; j++) 
    { 
      if (j != 0) 
      { 
        result += ","; 
      } 
      result += arrNum[j]; 
    } 
    lblResult2.Text = result; 
  } 
}