foreach遍历删除问题：

foreach (DataListItem it in DL_img.Items)
        {
            CheckBox cb = (CheckBox)it.FindControl("c2");
            if (cb.Checked == true)
            {
                string id = ((HiddenField)it.FindControl("h1")).Value;
                string url = d.getSingle("select url from tb_img where id='" + id + "'", false).ToString();
                d.getCount("delete tb_img where id='" + id + "'", false);
                bind();
                //删除本地图片
                string phyPath = Server.MapPath(url);
                FileInfo file = new FileInfo(phyPath);
                if (file.Exists)
                {
                    file.Delete();
                }
            }
        }

这个原因是由于：遍历所选中的数据库时每次删除一行就要刷新，这样foreach正在遍历无法获取删除的则提示。

ArrayList a1 = new ArrayList();
        foreach (DataListItem it in DL_img.Items)
        {
            CheckBox cb = (CheckBox)it.FindControl("c2");
            int i = 0;
            if (cb.Checked == true)
            {
                a1.Add(((HiddenField)it.FindControl("h1")).Value);

                i++;
            }
        }
        if (a1.Count > 0)
        {
            for (int i = 0; i < a1.Count; i++)
            {
                //if (!String.IsNullOrEmpty(a1[i].ToString()))
                //{
                string url = d.getSingle("select url from tb_img where id='" + a1[i].ToString() + "'", false).ToString();
                //}
                d.getCount("delete tb_img where id='" + a1[i].ToString() + "'", false);

                //删除本地图片
                string phyPath = Server.MapPath(url);
                FileInfo file = new FileInfo(phyPath);
                if (file.Exists)
                {
                    file.Delete();
                }
            }
            bind();
        }