排序不适用于 asp.net 网格视图中的分页

Question

你好朋友，我的分页工作正常，但是当对任何列进行排序时，它会在第一页上排序，但在下一页上排序会丢失。

请任何人都可以帮我解决这个问题。

我的 .aspx 标记代码

                <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>

我的代码背后：

    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

编辑：我建议采用以下方法来解决该问题：

将您的

Page_Load

方法更改为：

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

并将

Substance_Master_PageIndexChanging

方法更改为：

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();
}

说明： 在 PageIndexChanging 事件方法中进行数据绑定之前，需要先设置 GridView 的数据源。并且您可能需要根据当前的排序条件对数据源进行排序。