刪除多個asp.net轉發器只有複選框選擇的項目

Question

這裏它不顯示任何錯誤只有頁面加載是什麼錯誤？

C＃代碼

protected void imgs_Click(object sender, ImageClickEventArgs e) 
     {   
      foreach (RepeaterItem ri in repeater.Items) 
      { 

      CheckBox item_check = (CheckBox)ri.FindControl("item_check"); 
      Label txt_id = (Label)ri.FindControl("txt_id"); 

       if (item_check.Checked) 
       { 
        con = new SqlConnection(strcon); 
        SqlCommand cmd = new SqlCommand("ram", con); 
        cmd.CommandType = CommandType.StoredProcedure; 
        con.Open(); 
        cmd.Parameters.AddWithValue("@Action", "DELETE"); 
        cmd.Parameters.AddWithValue("@eid", txt_id); 
        repeat(); 
       }     
     }  
} 

asp.code

Answer 1

你忘了寫cmd.ExecuteNonQuery();

1. 停止使用AddWithValue

2. 始終使用usingSqlConnection用於和SqlCommand它實現IDisposable

   保護無效imgs_Click（對象發件人，ImageClickEventArgs E）
   {

   foreach (RepeaterItem ri in repeater.Items) 
       { 
   
       CheckBox item_check = (CheckBox)ri.FindControl("item_check"); 
       Label txt_id = (Label)ri.FindControl("txt_id"); 
   
        if (item_check.Checked) 
        { 
        Using(SqlConnection con = new SqlConnection(strcon)) 
         { 
        Using(SqlCommand cmd = new SqlCommand("ram", con)) 
         { 
         cmd.CommandType = CommandType.StoredProcedure; 
         con.Open(); 
         cmd.Parameters.Add("@Action",SqlDbType.Varchar,50).Value="DELETE"; 
         cmd.Parameters.Add("@eid",SqlDbType.Int).Value=Convert.ToInt16(txt_id.Text); 
         cmd.ExecuteNonQuery(); 
         repeat(); 
         } 
         } 
        }     
   }  
   

   }

Answer 2

foreach (RepeaterItem ri in repeater.Items) 
    { 

     CheckBox item_check = (CheckBox)ri.FindControl("item_check"); 
     Label txt_id = (Label)ri.FindControl("txt_id"); 

     if (item_check.Checked) 
     { 

      con = new SqlConnection(strcon); 
      cmd = new SqlCommand("ram", con); 
      cmd.CommandType = CommandType.StoredProcedure; 
      cmd.Parameters.AddWithValue("@Action", "DELETE"); 
      cmd.Parameters.AddWithValue("@eid", txt_id.Text); 
      try 
      { 
       con.Open(); 
       cmd.ExecuteNonQuery(); 

      } 
      catch (Exception ex) 
      { 
       ex.Message.ToString(); 
      } 
      finally 
      { 

       con.Close(); 
      } 
     } 
    } 
    repeat();