删除多个asp.net转发器项目，仅选择复选框

Question

这里它没有显示任何错误，只有页面加载错误是什么？

C＃代码

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

您忘了写cmd.ExecuteNonQuery();

1. 停止使用AddWithValue

2. 始终使用using SqlConnection和SqlCommand实施IDisposable

   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)
           {
         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();