Question

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

这是我目前的代码

                <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>

代码背后：

    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

Answer 1

您可以使用Repeater执行此操作。喜欢这个（你应该能够很容易地适应它）：

<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Code Behind上，OnItemDataBound看起来像这样：

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：

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

生成此输出：

enter image description here

Answer 2

您拥有的ASP.NET内容应放在Repeater中。然后，您拥有的files应按月份和日期进行分组。所以基本上你最终会得到一个父子列表。作为文件组的父级将绑定到Repeater，属于该组的文件的子级将绑定到GridView中的Repeater。

ASP.NET内容

ASP.NET内容将是这一行。请注意gvInvoiceList DataSource属性绑定到InvoiceList，这是我提出的组的属性（您将在下面的代码中看到），它将包含一个文件列表属于该组。

<asp:Repeater ID="repInvoiceGroups" runat="server">
    <ItemTemplate>
        <table width="40%" border="0" style="margin-left:auto; margin-right:auto;">
            <tr><td><asp:Label ID="lblGridHeader" CssClass="TextFont" 
                               Text='<%# Eval("MonthYear", "{0:MMMM yyyy}") %>' 
                               runat="server"></asp:Label></td></tr>
            <tr>
                <td align="center">
                    <asp:GridView ID="gvInvoiceList" runat="server" 
                                  AutoGenerateColumns="false" AllowSorting="true" 
                                  DataSource='<%# Eval("InvoiceList") %>'>
                        <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>
    </ItemTemplate>
</asp:Repeater>

代码隐藏

至于代码，我不能流利地使用DataTable来获得我用于答案的ASP.NET结构所需的父子关系，但是使用普通类应该很容易实现。而且我也不熟练使用VB.NET，所以请原谅我将使用C＃的例子，我想你应该能够很容易地将它转换成VB.NET。

我正在使用Linq进行分组，并使用匿名类来建立父子关系，因此代码相当短。

repInvoiceGroups.DataSource = files
    .GroupBy(f => f.LastWriteTime.ToString("yyyy-MM"))
    .Select(g => new { 
        MonthYear = DateTime.ParseExact(g.Key, "yyyy-MM", CultureInfo.InvariantCulture), 
        InvoiceList = g.OrderByDescending(f => f.LastWriteTime) })
    .OrderByDescending(o => o.MonthYear);
repInvoiceGroups.DataBind();

p / s：代码是在文本编辑器中编写的，未经测试。如果您遇到任何错误，请告诉我。：）

在asp.net中显示按月和年分组的记录

2 个答案:

ASP.NET内容

代码隐藏