无法序列化会话状态

Question

我厌倦了想知道这个问题的问题。我已经阅读了这么多的博客和论坛，但我无法找到这个问题。

我使用"SQLServer“模式来存储会话。

一切都很正常。但每当我在我的网站上使用搜索功能时，它就会抛出以下错误：

“无法序列化会话状态。在”“StateServer”“和”“SQLServer”“模式下，ASP.NET将序列化会话状态对象，因此不允许使用不可序列化的对象或MarshalByRef对象。如果自定义会话状态存储在”“custom”“模式下执行类似的序列化，则同样的限制也适用。”

我假设这是因为我在那个页面上使用了分页代码。该代码如下所示：

 protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        string query = "select xxxxqueryxxxx";
        SqlDataAdapter da = new SqlDataAdapter(query, con);
        DataSet ds = new DataSet();
        try
        {
            using (con)
            {
                con.Open();
                da.Fill(ds);
            }
        }
        catch
        {
            ds = null;
        }
        finally
        {
            if (ds != null)
            {
                CustomPaging page = new CustomPaging();
                DataTable dt = ds.Tables[0];
                page.PageSize = 10;
                page.DataSource = dt;
                page.CurrentPageIndex = 0;
                no = 1;
                Session["DT"] = dt;
                Session["page"] = page;
                bindData(page, dt);

                //set these properties for multi columns in datalist
                DataList2.RepeatColumns = 1;
                DataList2.RepeatDirection = RepeatDirection.Horizontal;
            }
        }
    }
}
void bindData(CustomPaging page, DataTable dt)
{
    try
    {
        DataList2.DataSource = page.DoPaging;
        DataList2.DataBind();
        //DataList2.DataSource = SqlDataSource1;
        //DataList2.DataBind();
        lbtnPre.Enabled = !page.IsFirstPage; //Enable / Disable Navigation Button
       // lbtnPre.CssClass = "disabledbtn";
        lbtnNext.Enabled = !page.IsLastPage;
        //lbtnNext.CssClass = "disabledbtn";
        lblStatus.Text = NavigationIndicator(); //Build Navigation Indicator 
        //for creating page index
        DataTable dt1 = new DataTable();
        dt1.Columns.Add("PageIndex");
        dt1.Columns.Add("PageText");

        for (int i = 0; i < page.PageCount; i++)
        {
            DataRow dr = dt1.NewRow();
            dr[0] = i;
            dr[1] = i + 1;
            dt1.Rows.Add(dr);
        }
        dlPaging.DataSource = dt1;
        dlPaging.DataBind();
        dlPaging.RepeatColumns = 10;
        dlPaging.RepeatDirection = RepeatDirection.Horizontal;
    }
    catch (Exception)
    {
    }
    finally
    {
        page = null;
    }
}
string NavigationIndicator()
{
    string str = string.Empty;     //Page x Of Y
    str = Convert.ToString(((CustomPaging)Session["page"]).CurrentPageIndex + 1) + " of " + ((CustomPaging)Session["PAGE"]).PageCount.ToString() + " Page(s) found";
    return str;
}
protected void lbtnPre_Click(object sender, EventArgs e)
{
    int pageIndex = ((CustomPaging)Session["page"]).CurrentPageIndex;
    if (!((CustomPaging)Session["page"]).IsFirstPage)
        //Decrements the pageIndex by 1 (Move to Previous page)
        ((CustomPaging)Session["page"]).CurrentPageIndex -= 1;
    else
        ((CustomPaging)Session["page"]).CurrentPageIndex = pageIndex;

    //Binds the DataList with new pageIndex
    bindData(((CustomPaging)Session["page"]), ((DataTable)Session["DT"]));
}
protected void lbtnNext_Click(object sender, EventArgs e)
{
    int pageIndex = ((CustomPaging)Session["page"]).CurrentPageIndex;
    if (!((CustomPaging)Session["page"]).IsLastPage)
        //Increments the pageIndex by 1 (Move to Next page)
        ((CustomPaging)Session["page"]).CurrentPageIndex += 1;
    else
        ((CustomPaging)Session["page"]).CurrentPageIndex = pageIndex;

    //Binds the DataList with new pageIndex
    bindData(((CustomPaging)Session["page"]), ((DataTable)Session["DT"]));
}
protected void DataList2_SelectedIndexChanged(object sender, EventArgs e)
{
    Response.Redirect("Default2.aspx?partnumber=" + DataList2.DataKeyField[DataList2.SelectedIndex].ToString());
}
protected void dlPaging_ItemCommand(object source, DataListCommandEventArgs e)
{
    if (e.CommandName == "Select")
    {
        no = int.Parse(e.CommandArgument.ToString()) + 1;
        ((CustomPaging)Session["page"]).CurrentPageIndex = int.Parse(e.CommandArgument.ToString());
        //Binds the DataList with new pageIndex
        bindData(((CustomPaging)Session["page"]), ((DataTable)Session["DT"]));

    }
}
protected void dlPaging_ItemDataBound(object sender, DataListItemEventArgs e)
{
    LinkButton btn = (LinkButton)e.Item.FindControl("lnkbtnPaging");

    if (btn.Text == no.ToString())
    {
        btn.ForeColor = System.Drawing.Color.Maroon;
        btn.Font.Underline = false;
    }
    else
    {
        btn.ForeColor = System.Drawing.Color.DarkCyan;
        btn.Font.Underline = false;
    }
}

我只想知道编码和“如何序列化会话”中的问题是什么？我应该做些什么来改进编码？

任何帮助都将不胜感激。

谢谢

Answer 1

我猜您的自定义分页控件是不可序列化的。这一定是问题的原因。

无论如何，在会话中存储控件不是一个好主意。只需存储几个可序列化的属性(PageSize和CurrentPageIndex)即可重建控件，或者以查询字符串的形式传递它们。

如果可以，您也可以使用ViewState

关于在会话中存储DataTable，如果您有大量数据和许多连接的用户，这可能是一个非常糟糕的主意。