回发不维护所选值

我有一个包含几个动态生成的下拉列表的页面。The DDs load and display the correct values on page load. 但是,当我尝试在回发时检索值时,DDS似乎都在维护页面加载时的值。

全部在页面加载中创建; 无IsPostback测试; 处理的代码如下:

void btnSubmit_Click(object sender, EventArgs e)

{

System.IO.StreamWriter sw = new System.IO.StreamWriter(Server.MapPath("\\") + "\\Logs\\Permissions.log",false);

string szMask = hMask.Value.ToString();
sw.WriteLine("\t\t\t\t\t\t\t" + szMask);

foreach (Control c in Page.Controls)
    LoopControls(c, szMask, sw);
sw.Close();
}

private void LoopControls(Control Page, string szMask, System.IO.StreamWriter sw)
{

foreach (Control c in Page.Controls)
{
    if (c is DropDownList)
    {
        string szId = c.ID;
        if (szId.StartsWith("ddlPerm"))
        {
            string[] szSplit = szId.Split(':');
            int iMaskPosition = Convert.ToInt32(szSplit[1].ToString());
            int iSecurityPermissionID = Convert.ToInt32(szSplit[2].ToString());
            DropDownList dd = (DropDownList)c;
            string szPermission = dd.SelectedValue.ToString();
            if (szMask.Substring(iMaskPosition, 1) != szPermission)
            {
                sw.WriteLine("NE");
                if (iMaskPosition == 0)
                    szMask = szPermission + szMask.Substring(1);
                else
                    szMask = szMask.Substring(0, iMaskPosition) + szPermission + szMask.Substring(iMaskPosition);
            }
            sw.WriteLine(szId + "\t\t" + iMaskPosition.ToString() + "\t" + iSecurityPermissionID.ToString() + "\t" + szPermission + "\t\t" + szMask);
        }
    }
    else
    {
        if (c.Controls.Count > 0)
        {
            LoopControls(c, szMask, sw);
        }
    }
}
}

这真让我恼火。任何帮助都将不胜感激。

谢谢, JB