排序不能在asp.net的網格視圖中使用分頁

Question

你好朋友我的分頁工作正常，但是當排序任何列時，它會在第一頁排序，但在下一頁排序會丟失。

請任何人都可以幫我弄清楚這一點。

我的標記代碼的.aspx

   <asp:TemplateField HeaderText="Actions" ItemStyle-Width="20%"> 
        <ItemTemplate> 
         <a href='#' onclick="javascript:view_data(<%#Eval("Substance_ID")%>)"><span class="glyphicon glyphicon-eye-open"></span>View</a> 
         &nbsp; 
        <a href='edit.aspx?id=<%#Eval("Substance_ID")%>'><span class="glyphicon glyphicon-pencil"></span>Edit</a> 
         &nbsp; 
        <a href='delete.aspx?id=<%#Eval("Substance_ID")%>'><span class="glyphicon glyphicon-trash"></span>Delete</a> 
        </ItemTemplate> 
       </asp:TemplateField> 

       <asp:BoundField DataField="Substance_ID" HeaderText="Substance ID" SortExpression="Substance_ID" /> 

       <asp:TemplateField HeaderText="CAS Number" ItemStyle-Width="10%" SortExpression="CAS_Number"> 
        <ItemTemplate> 
         <%# Eval("CAS_Number").ToString().Trim()%> 
        </ItemTemplate> 
       </asp:TemplateField> 
       <asp:TemplateField HeaderText="EC Number" ItemStyle-Width="10%" SortExpression="EC_Number"> 
        <ItemTemplate> 
         <%# Eval("EC_Number").ToString().Trim()%> 
        </ItemTemplate> 
       </asp:TemplateField> 
       <asp:TemplateField HeaderText="Substance Name" SortExpression="Substance_Name"> 
        <ItemTemplate> 
         <%#Eval("Substance_Name").ToString().Trim()%> 
        </ItemTemplate> 
       </asp:TemplateField> 
       <asp:TemplateField HeaderText="Primary SG ID" ItemStyle-Width="10%" SortExpression="Primary_SG_ID"> 
        <ItemTemplate> 
         <%#Eval("Primary_SG_ID")%> 
        </ItemTemplate> 
       </asp:TemplateField> 
       <asp:TemplateField HeaderText="Status" ItemStyle-Width="5%" SortExpression="Status"> 
        <ItemTemplate> 
         <%#Eval("Status")%> 
        </ItemTemplate> 
       </asp:TemplateField> 
      </Columns> 
      <PagerStyle CssClass="my_pagination" /> 
      <PagerSettings Mode="NumericFirstLast" FirstPageText="First" LastPageText="Last" PageButtonCount="10" /> 
      <EmptyDataTemplate>No Data</EmptyDataTemplate> 

     </asp:GridView> 
     <asp:Label runat="server" ID="lblCount"></asp:Label> 

後面我的代碼：

protected void Page_Load(object sender, EventArgs e) 
    { 
     if(!IsPostBack) 
     { 
      BindGridViewData(); 
     } 
    } 
    private void BindGridViewData() 
    { 
     List<Substance_Display> Substance_List = new List<Substance_Display>(); 
     Substance_List = Substance_MasterAccessLayer.GetAllSubstances("Substance_ID"); 
     Substance_Master.DataSource = Substance_List; 
     Substance_Master.DataBind(); 
     lblCount.Text = "Total " + Substance_List.Count().ToString() + " Records found."; 
    } 
    protected void Substance_Master_PageIndexChanging(object sender, GridViewPageEventArgs e) 
    { 
     Substance_Master.PageIndex = e.NewPageIndex; 
     Substance_Master.DataBind(); 
    } 
    private void SortGridView(GridView Substance_Master, GridViewSortEventArgs e, out SortDirection sortDirection, out string sortField) 
    { 
     sortField = e.SortExpression; 
     sortDirection = e.SortDirection; 
     if (Substance_Master.Attributes["CurrentSortField"] != null & Substance_Master.Attributes["CurrentSortDirection"] != null) 
     { 
      if (sortField == Substance_Master.Attributes["CurrentSortField"]) 
      { 
       if (Substance_Master.Attributes["CurrentSortDirection"] == "ASC") 
       { 
        sortDirection = SortDirection.Descending; 
       } 
       else 
       { 
        sortDirection = SortDirection.Ascending; 
       } 

      } 
      Substance_Master.Attributes["CurrentSortField"] = sortField; 
      Substance_Master.Attributes["CurrentSortDirection"] = (sortDirection == SortDirection.Ascending ? "ASC" : "DESC"); 
     } 
    } 
    protected void Substance_Master_Sorting(object sender, GridViewSortEventArgs e) 
    { 
     SortDirection sortDirection = SortDirection.Ascending; 
     string sortField = string.Empty; 
     SortGridView(Substance_Master, e, out sortDirection, out sortField); 
     string strSortDirection = sortDirection == SortDirection.Ascending ? "ASC" : "DESC"; 
     Substance_Master.DataSource = Substance_MasterAccessLayer.GetAllSubstances(e.SortExpression + " " + strSortDirection); 
     Substance_Master.DataBind(); 
    } 

Answer 1

編輯：我建議以下來解決該問題：

變化您的Page_Load方法爲：

protected void Page_Load(object sender, EventArgs e) 
{ 
    if(!IsPostBack) 
    { 
      Substance_Master.Attributes["CurrentSortField"] = "Substance_ID"; 
      Substance_Master.Attributes["CurrentSortDirection"] = "ASC"; 
      BindGridViewData(); 
    } 
} 

並更改Substance_Master_PageIndexChanging方法是：

protected void Substance_Master_PageIndexChanging(object sender, GridViewPageEventArgs e) 
{ 
    Substance_Master.PageIndex = e.NewPageIndex; 
    var sortField = Substance_Master.Attributes["CurrentSortField"]; 
    var sortDirection = Substance_Master.Attributes["CurrentSortDirection"]; 

    if (sortField != null && sortDirection != null) 
    { 
     Substance_Master.DataSource = Substance_MasterAccessLayer.GetAllSubstances(sortField + "" + sortDirection); 
    } 

    Substance_Master.DataBind(); 
} 

說明：你需要PageIndexChanging事件的方法DataBind之前設置的GridView的數據源。您可能需要根據當前的排序條件對數據源進行排序。