如何允许排序gridview？

Question

我有一个gridview并启用了排序.运行应用程序时,我单击第一列进行排序.我得到这个错误:"GridView'gvOutlookMeldingen'触发了事件排序,但没有处理."

这是gridview:

<asp:GridView ID="gvOutlookMeldingen" runat="server" AllowSorting="True" AutoGenerateColumns="False" AutoGenerateSelectButton="True" onselectedindexchanged="GridView_SelectedIndexChanged">
    <Columns>
        <asp:TemplateField HeaderText="Melder" ItemStyle-HorizontalAlign="Center" SortExpression="Melder">
            <HeaderStyle BorderColor="#1A3491" Width="130px"></HeaderStyle>
            <ItemStyle Height="20px" HorizontalAlign="Center"></ItemStyle>
            <ItemTemplate>
                <%# (string)Eval("Melder") %>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="Onderwerp" HeaderText="Onderwerp" />
        <asp:TemplateField HeaderText="Omschrijving">
            <ItemTemplate>
                <div style="overflow:auto; width: 500px; height: 200px;">
                    <asp:Label ID="lblOmschrijving" runat="server" Text='<%# Bind("Omschrijving")%>'></asp:Label>
                </div>
            </ItemTemplate>
        </asp:TemplateField>
        <asp:BoundField DataField="Meldingsdatum" HeaderText="Meldingsdatum" />
        <asp:BoundField DataField="OutlookID" HeaderText="OutlookID" />
    </Columns>
</asp:GridView>

任何帮助表示赞赏

Answer 1

如其他答案中所提到的,你在想念SortExpression自己BoundField.

您还使用了一个TemplateField,根据生成数据的内容,可能需要手动排序而不是使用SortExpression.

如果是这种情况,那么要手动排序,一种方法是向您的字段添加OnSorting回调GridView,SortExpression并在代码隐藏中添加回调方法.

这将导致标记和代码类似于(未经测试):

<asp:GridView ID="gvOutlookMeldingen" runat="server" 
    AllowSorting="True" 
    OnSorting="gvOutlookMeldingen_Sorting"
    AutoGenerateColumns="False" 
    AutoGenerateSelectButton="True" 
    onselectedindexchanged="GridView_SelectedIndexChanged">
    <Columns>
        <asp:BoundField DataField="Melder" HeaderText="Melder" SortExpression="Melder" />
        <asp:BoundField DataField="Onderwerp" HeaderText="Onderwerp" SortExpression="Onderwerp" />
            <asp:TemplateField HeaderText="Omschrijving" SortExpression="Omschrijving">
                <ItemTemplate>
                    <div style="overflow:auto; width: 500px; height: 200px;">
                        <asp:Label ID="lblOmschrijving" runat="server" Text='<%# Bind("Omschrijving")%>'></asp:Label>
                    </div>
                </ItemTemplate>
            </asp:TemplateField>
        <asp:BoundField DataField="Meldingsdatum" HeaderText="Meldingsdatum" SortExpression="Meldingsdatum" />
        <asp:BoundField DataField="OutlookID" HeaderText="OutlookID" SortExpression="OutlookID" />
    </Columns>
</asp:GridView>

...和:

protected void gvOutlookMeldingen_Sorting(object sender, GridViewSortEventArgs e)
{
    switch (e.SortExpression)
    {
        case "Melder":
        if (e.SortDirection == SortDirection.Ascending)
        {
            gvOutlookMeldingen.DataSource = // Asc query for Melder field;
            gvOutlookMeldingen.DataBind();
        }
        else
        {
            gvOutlookMeldingen.DataSource = // Desc query for Melder field ;
            gvOutlookMeldingen.DataBind();
        }
        break;
        // case statements for your other fields.
    }
}

Answer 2

这段代码可能会有所帮助(对于你们这个老帖子的google):

protected void gvOutlookMeldingen_Sorting(object sender, GridViewSortEventArgs e)
{
    DataTable dt = (DataTable)Session["mySessionStoredTable"];
    dt.DefaultView.Sort = e.SortExpression // column name
        + " " + SortDir(e.SortExpression); // sort direction
    gv.DataSource = dt;
    gv.DataBind();
}

private string SortDir(string sColumn)
{
    string sDir = "asc"; // ascending by default
    string sPreviousColumnSorted = ViewState["SortColumn"] != null 
        ? ViewState["SortColumn"].ToString() 
        : "";

    if (sPreviousColumnSorted == sColumn) // same column clicked? revert sort direction
        sDir = ViewState["SortDir"].ToString() == "asc" 
            ? "desc"
            : "asc";
    else
        ViewState["SortColumn"] = sColumn; // store current column clicked

    ViewState["SortDir"] = sDir; // store current direction

    return sDir;
}

Answer 3

您需要设置SortExpression要排序的列的属性.并且您需要向事件添加事件处理程序Sorting以使排序在DataSource上运行.

有关详细信息,请参阅此MSDN文章或带有排序和分页的此示例.