在asp.net中显示按月和年分组的记录 [英] Displaying records grouped by month and year in asp.net

问题描述

我需要按 asp.net 页面上显示的日期(月份和年份)对我的记录进行排序；
任何想法/建议都会有所帮助.

I need to sort my records by date (month & year) as displayed on my asp.net page;
Any ideas / suggestions would be helpful.

这是我目前拥有的代码

                <table width="40%" border="0" style="margin-left:auto; margin-right:auto;">
                    <tr><td><asp:Label ID="lblGridHeader" CssClass="TextFont" Text="" runat="server"></asp:Label></td></tr>
                    <tr>
                        <td align="center">
                            <asp:GridView ID="gvInvoiceList" runat="server" AutoGenerateColumns="false" AllowSorting="true">
                                <columns>
                                    <asp:TemplateField ItemStyle-Width="10%" HeaderText="File Type">
                                        <ItemTemplate><asp:HyperLink ID="imgFileType" ImageUrl="images/Icon_Pdf.gif" NavigateUrl='<%# SetNavigateUrl(Eval("Name")) %>' runat="server"></asp:HyperLink></ItemTemplate>
                                    </asp:TemplateField>
                                  <asp:boundfield datafield="Name" headertext="Invoice #"/>
                                  <asp:boundfield datafield="LastWriteTime" headertext="Date Modified"/>
                                </columns>
                            </asp:GridView>
                        </td>
                    </tr>
                </table>

背后的代码:

    If files.Count > 0 Then
        Dim DT As New DataTable()
        DT.Columns.Add(New DataColumn("Name", System.Type.GetType("System.String")))
        DT.Columns.Add(New DataColumn("LastWriteTime", System.Type.GetType("System.String")))

        Dim strCurrentMonth As String = ""

        For Each f As FileInfo In files
            If (MonthName(f.LastWriteTime.Month) <> strCurrentMonth) And (strCurrentMonth <> "") Then
                gvInvoiceList.DataSource = DT
                gvInvoiceList.DataBind()

                lblGridHeader.Text = MonthName(f.LastWriteTime.Month) & " - " & Year(f.LastWriteTime)
            Else
                lblGridHeader.Text = MonthName(f.LastWriteTime.Month) & " - " & Year(f.LastWriteTime)
            End If

            Dim Row1 As DataRow
            Row1 = DT.NewRow()
            Row1("Name") = f.Name
            Row1("LastWriteTime") = f.LastWriteTime
            DT.Rows.Add(Row1)

            strCurrentMonth = MonthName(f.LastWriteTime.Month)
        Next
        gvInvoiceList.DataSource = DT
        gvInvoiceList.DataBind()
    Else
        lblSummary.Text = "No data to show."
    End If  

推荐答案

您可以使用中继器执行此操作.类似这样的东西(你应该很容易适应):

You can do this with a Repeater. Something like this (you should be able to adapt it easily):

<asp:Repeater ID="rpt" runat="server" OnItemDataBound="rpt_RowDataBound">
        <ItemTemplate>
            <table runat="server" style="color: White; background-color: #3A4F63;" visible="false"
                id="headerTable">
                <tr>
                    <td colspan="3">
                        <asp:Label ID="headerTitle" runat="server"></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td style="width: 200px; background-color: #3A4F63; color: White;">
                        Name
                    </td>
                    <td style="width: 200px;">
                        Directory Name
                    </td>
                    <td style="width: 200px;">
                        Creation Time
                    </td>
                </tr>
            </table>
            <!-- These are the actual data items -->
            <!-- Bind to your specific properties i.e. Invoice #, file type, etc. -->
            <table>
                <tr>
                    <td style="width: 200px;">
                        <asp:Label ID="lblName" runat="server" Text='<%#Eval("Name") %>'></asp:Label>
                    </td>
                    <td style="width: 200px;">
                        <asp:Label ID="lblDirName" runat="server" Text='<%#Eval("DirectoryName") %>'></asp:Label>
                    </td>
                    <td style="width: 200px;">
                        <asp:Label ID="lblCreationTime" runat="server" Text='<%#Eval("CreationTime") %>'></asp:Label>
                    </td>
                </tr>
            </table>
        </ItemTemplate>
    </asp:Repeater>

在代码隐藏上，OnItemDataBound 看起来像这样:

On Code Behind, the OnItemDataBound looks like this:

Private month As Integer = -1
Private year As Integer = -1
Protected Sub rpt_RowDataBound(sender As Object, e As RepeaterItemEventArgs)

    If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
    'Binding to FileInfo objects. You are binding to DataTable. Adjust it accordingly
        If month <> TryCast(e.Item.DataItem, FileInfo).CreationTime.Month OrElse year <> TryCast(e.Item.DataItem, FileInfo).CreationTime.Year Then
            month = TryCast(e.Item.DataItem, FileInfo).CreationTime.Month
            year = TryCast(e.Item.DataItem, FileInfo).CreationTime.Year
            e.Item.FindControl("headerTable").Visible = True
            TryCast(e.Item.FindControl("headerTitle"), Label).Text = "Files for " & TryCast(e.Item.DataItem, FileInfo).CreationTime.ToShortDateString()
        Else
            e.Item.FindControl("headerTable").Visible = False
        End If
    End If
End Sub

我将数据绑定到转发器的方式是这样的:

The way I bound my data to the repeater is like this:

Dim fi As FileInfo() = New DirectoryInfo("C:").GetFiles().OrderByDescending(Function(x) x.CreationTime).ToArray()
rpt.DataSource = fi
rpt.DataBind()

产生这个输出:

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