C# 无法按des顺序对gridview进行排序，也无法对另一列进行排序？

我有这个网格视图，它有两个问题

如果我通过单击一列对其排序，然后再次单击，则它不会按des顺序排序

如果有一次我用a列进行排序，然后单击任何其他列，那么它不会再次排序吗

  <asp:GridView ID="grdReport" runat="server" AutoGenerateColumns="False" DataKeyNames="CustCode"
ShowFooter="True" EmptyDataText="No record found" PageSize="50"
CssClass="mGrid" onrowdatabound="grdReport_RowDataBound"
AllowSorting="True" onsorting="grdReport_Sorting">
<Columns>
   <asp:TemplateField HeaderText="Select">
        <ItemTemplate>
            <asp:CheckBox ID="chkSelect" runat="server"/>
        </ItemTemplate>
   </asp:TemplateField>

   <asp:TemplateField Visible="false">
   <ItemTemplate>
   <asp:Label ID="lblCustCodes" runat="server" Text='<%# Eval("CustCode") %>' CssClass="grdCustName"></asp:Label>
   </ItemTemplate>
   </asp:TemplateField>

  <asp:TemplateField HeaderText="Customer" SortExpression="Customer">
  <ItemTemplate>
   <asp:HyperLink Target="_blank" Text='<%# Eval("CustomerName") %>' runat="server" ID="hplNavigate">
   </asp:HyperLink>
   </ItemTemplate>
   </asp:TemplateField>
    <asp:BoundField DataField="QTY" HeaderText="Booked Qty" HeaderStyle-HorizontalAlign="Right" ItemStyle-HorizontalAlign="Right"
        SortExpression="QTY">
        <FooterStyle HorizontalAlign="Right" />
        <ItemStyle HorizontalAlign="Right"></ItemStyle>
    </asp:BoundField>
       <asp:BoundField DataField="Volume" HeaderText="Booked Amt" HeaderStyle-HorizontalAlign="Right" ItemStyle-HorizontalAlign="Right"
        SortExpression="Volume">
        <FooterStyle HorizontalAlign="Right" />
        <ItemStyle HorizontalAlign="Right"></ItemStyle>
    </asp:BoundField>
    </asp:BoundField>
     <asp:BoundField DataField="FirstBill" HeaderText="First Bill" HeaderStyle-HorizontalAlign="left" ItemStyle-HorizontalAlign="left"
        SortExpression="FirstBill">
        <FooterStyle HorizontalAlign="Left" />
        <ItemStyle HorizontalAlign="Left"></ItemStyle>
    </asp:BoundField>
</Columns>
<FooterStyle BackColor="Aqua" Font-Bold="true" ForeColor="BlueViolet"/>

再次列出问题

再次单击时无法按des排序

如果我按客户名称排序，然后单击

qty

或我得到的任何其他

指定类型无效。

意味着，一旦我按任何特定列排序，我就无法通过单击任何其他列进行排序

---

有人能帮我解决这个问题吗？

您必须允许gridview根据gridview属性进行排序

 AllowSorting="true" 

此外，还必须将排序存储在缓存（viewstate或session）中。使用会话变量存储最新的排序表达式，并在下次对网格进行排序时，将网格的排序表达式与存储最后一个排序表达式的会话变量相比较。如果列相等，则检查上一次排序的方向和反向排序

例如：

DataTable sourceTable = GridAttendence.DataSource as DataTable;
DataView view = new DataView(sourceTable);
string[] sortData = Session["sortExpression"].ToString().Trim().Split(' ');
if (e.SortExpression == sortData[0])
{
    if (sortData[1] == "ASC")
    {
        view.Sort = e.SortExpression + " " + "DESC";
        this.ViewState["sortExpression"] = e.SortExpression + " " + "DESC";
    }
    else
    {
        view.Sort = e.SortExpression + " " + "ASC";
        this.ViewState["sortExpression"] = e.SortExpression + " " + "ASC";
    }
}
else
{
    view.Sort = e.SortExpression + " " + "ASC";
    this.ViewState["sortExpression"] = e.SortExpression + " " + "ASC";
}

---

在网格中，当AutoGenerateColumns=“false”时，e.SortDirection将始终递增。解决方法是需要在ViewState中存储列的最后一个排序器（或存储每个列的最后一个排序顺序）

    public const string ASCENDING = "Ascending";
    public const string DESCENDING = "Descending";

定义属性以保留排序器

    public string GridSortOrder
    {
        get { return Convert.ToString(ViewState["SortOrderKey"]) == string.Empty ? ASCENDING : "Descending"; }
        set { ViewState["SortOrderKey"] = value; }
    }

在grdReport_排序事件中

     if (GridSortOrder == ASCENDING)
        {
            var result = from table in Ob.DataTableOther.AsEnumerable()
                         orderby table.Field<string>("CustomerName")
                         select table;
            var dv = result.AsDataView();
            grdReport.DataSource = dv;
            grdReport.DataBind();

        }
        else
        {
            var result = from table in Ob.DataTableOther.AsEnumerable()
                         orderby table.Field<string>("CustomerName") descending
                         select table;
            var dv = result.AsDataView();
            grdReport.DataSource = dv;
            grdReport.DataBind();   
        }

         /*
         * logic for remaining columns 
         */

        //Change the sortOrder
        ChangeSortOrder(GridSortOrder);

试试这个方法

private const string ASCENDING = " ASC";
private const string DESCENDING = " DESC";
static private DataView dvReports;

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // i am assuming that you are binding the gridview on page_load
        // you can use the same on a button click event too
        dvReports = new DataView(Ob.DataTableOther);
        BindGridView();
    }
}

protected void grdReport_Sorting(object sender, GridViewSortEventArgs e)
{
    string sortExpression = e.SortExpression;

    if (GridViewSortDirection == SortDirection.Ascending)
    {
        GridViewSortDirection = SortDirection.Descending;
        dvProducts.Sort = sortExpression + DESCENDING;
    }
    else
    {
        GridViewSortDirection = SortDirection.Ascending;
        dvProducts.Sort = sortExpression + ASCENDING;
    }
    BindGridView();
}

private void BindGridView()
{
    GridView1.DataSource = dvReports
    GridView1.DataBind();
}

public SortDirection GridViewSortDirection
{
    get
    {
        if (ViewState["sortDirection"] == null)
            ViewState["sortDirection"] = SortDirection.Ascending;

        return (SortDirection)ViewState["sortDirection"];
    }
    set { ViewState["sortDirection"] = value; }
}

我之所以为您写这篇文章，是因为如果您使用

DataTable

进行绑定，则无需使其

IEnumerable

并进行自定义排序。这是不必要的，而且还有更多的代码行

---

框架是你的朋友。愉快的编码。

您可能需要将

会话[“sortExpression”]

更改为

ViewState[“sortExpression”]

     if (GridSortOrder == ASCENDING)
        {
            var result = from table in Ob.DataTableOther.AsEnumerable()
                         orderby table.Field<string>("CustomerName")
                         select table;
            var dv = result.AsDataView();
            grdReport.DataSource = dv;
            grdReport.DataBind();

        }
        else
        {
            var result = from table in Ob.DataTableOther.AsEnumerable()
                         orderby table.Field<string>("CustomerName") descending
                         select table;
            var dv = result.AsDataView();
            grdReport.DataSource = dv;
            grdReport.DataBind();   
        }

         /*
         * logic for remaining columns 
         */

        //Change the sortOrder
        ChangeSortOrder(GridSortOrder);

    public void ChangeSortOrder(string currentOrder)
    {
        GridSortOrder = currentOrder == ASCENDING ? DESCENDING : ASCENDING;
    }

private const string ASCENDING = " ASC";
private const string DESCENDING = " DESC";
static private DataView dvReports;

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        // i am assuming that you are binding the gridview on page_load
        // you can use the same on a button click event too
        dvReports = new DataView(Ob.DataTableOther);
        BindGridView();
    }
}

protected void grdReport_Sorting(object sender, GridViewSortEventArgs e)
{
    string sortExpression = e.SortExpression;

    if (GridViewSortDirection == SortDirection.Ascending)
    {
        GridViewSortDirection = SortDirection.Descending;
        dvProducts.Sort = sortExpression + DESCENDING;
    }
    else
    {
        GridViewSortDirection = SortDirection.Ascending;
        dvProducts.Sort = sortExpression + ASCENDING;
    }
    BindGridView();
}

private void BindGridView()
{
    GridView1.DataSource = dvReports
    GridView1.DataBind();
}

public SortDirection GridViewSortDirection
{
    get
    {
        if (ViewState["sortDirection"] == null)
            ViewState["sortDirection"] = SortDirection.Ascending;

        return (SortDirection)ViewState["sortDirection"];
    }
    set { ViewState["sortDirection"] = value; }
}