如何从viewstate中读取值

Question

在asp.net gridview中，启用分页。页面大小为10.当选中多个复选框时，复选框状态正在维护。但问题是当我们clcik只提交当前页面选择的记录时才添加到列表中。我想要添加entiere gridview seleted记录。

protected void gvFiling_DataBound(object sender, EventArgs e) 
{
    if (gvFiling.Rows.Count > 0 && ViewState["datakeys"] != null) 
    {
        List < object > datakeys = (List < object > ) ViewState["datakeys"];
        foreach(GridViewRow row in gvFiling.Rows)
        ((CheckBox) row.FindControl("cbxApply")).Checked = datakeys.Contains(gvFiling.DataKeys[row.RowIndex].Value);
    }
}
protected void FullPostBack_Click(object sender, EventArgs e)
{
    List < DataKey > applyList = new List < DataKey > ();
    //there are 30 records. each page is having 10 records. selected checkbox records in the current page only added to list
    //requirment is add the selected records from 3 pages.
    foreach(GridViewRow row in gvFiling.Rows) 
    {
        CheckBox cb = (CheckBox) row.FindControl("cbxApply");
        if (cb != null) if (cb.Checked) applyList.Add(gvFiling.DataKeys[row.RowIndex]);
    }

    if (applyList.Count > 0) 
    {
        GB.TLS.Business.ServiceHandler.FERCDocket.TariffFiling_DocketSearch_ApplyAssociations(applyList, this.AssociatedObjectType, this.AssociatedRecordID, SessionWrapper.UserModel.UserId);
        gvFiling.DataBind();
    }
    if (ApplyFiling != null) ApplyFiling();
    mpeSearch.Hide();
}

protected void gvFiling_PageIndexChanging（Object sender，GridViewPageEventArgs e）     {         列表＆lt;对象＆gt; datakeys = ViewState [“datakeys”]！= null？ （List＆lt; object＆gt;）ViewState [“datakeys”]：new List＆lt;对象＆gt; （）;         //添加选中的DataKeys
        foreach（gvFiling.Rows中的GridViewRow行）         if（（（CheckBox）row.FindControl（“cbxApply”））。checked）datakeys.Add（gvFiling.DataKeys [row.RowIndex] .Value）;         else datakeys.Remove（gvFiling.DataKeys [row.RowIndex] .Value）;         ViewState [“datakeys”] = datakeys;     }