C# 中继器对单个数据库中的项目进行分组_C#_Asp.net_Repeater

C# 中继器对单个数据库中的项目进行分组

c# asp.net

C# 中继器对单个数据库中的项目进行分组,c#,asp.net,repeater,C#,Asp.net,Repeater,我有一个带有标题的表（示例）：Group、DisplayName、EditableData、description。在过去的几天里，我一直在尝试学习Repeater，根据组对信息进行排序，这样我就可以得到如下布局。这是一个用户控件，我正试图把它们放在一起 Group1 ------------------ Name1 EditableData Some Description Name2 EditableData Some Description Group2 -

我有一个带有标题的表（示例）：Group、DisplayName、EditableData、description。在过去的几天里，我一直在尝试学习Repeater，根据组对信息进行排序，这样我就可以得到如下布局。这是一个用户控件，我正试图把它们放在一起

Group1
------------------
Name1     EditableData    Some Description
Name2     EditableData    Some Description

Group2
------------------
Name3     EditableData    Some Description
Name4     EditableData    Some Description

我在网上查看了以下其他示例：和

我相信我没有正确地理解中继器如何工作到足以处理嵌套或数据源

<asp:Repeater ID="Repeater1" runat="server">
    <ItemTemplate>
        Group: <%#Eval("Group")%><br />
        <%--Nested Repeater would go here for all the children info for each "Group"--%>
    </ItemTemplate>
</asp:Repeater>


组：

在我的SQL中使用DISTINCT只检索“Group”只会给我留下正确的组，而不需要重复，我想我可以改为在标签中设置组，然后为每个特定的标签创建重复器。。。当我以后可能会将editableData更新回数据库时，这看起来很糟糕

我想我真正想要的至少是一个到演练的链接，该演练解释了中继器如何与Eval（）和数据源一起工作。我的意思是，完成项目第一步所需的一切代码都是完美的；P但我也希望能够更好地理解这些，因为我可能会在不久的将来经常使用它们。

我曾经遇到过同样的问题，我要按组对数据进行排序，并且我必须在分组段中显示常用项

当然，有多种方法可以检索数据，例如，您可以获取不同的组名并将其绑定到中继器，然后在

ItemDataBound

事件上执行并获取类似以下内容的其他元素：

<asp:Repeater runat="server" ID="rptrGroups" OnItemDataBound="rptrGroups_ItemDataBound">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv">
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

protected void rptrGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        var lblGroupName = (Label)e.Item.FindControl("lblGroupName");
        GridView gv = (GridView)e.Item.FindControl("table");

        var dataTable = FetchDataWithGroupName(lblGroupName.Text); // Method that fetches data with groupname.
        gv.DataSource = dataTable;
        gv.DataBind();
    }
}

<asp:Repeater runat="server" ID="rptrGroups">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv" DataSource='<%# ((GroupedModel)Container.DataItem).TableData %>'>
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

    Dim strSQL As String = 
       "SELECT ID, FirstName, LastName, HotelName, City FROM tblHotels ORDER BY City, HotelName"

    GridView1.DataSource = Myrst(strSQL)
    GridView1.DataBind()

    If e.Row.RowType = DataControlRowType.DataRow Then

        ' if grouping = 1 then create a new row!
        Dim gvRow As DataRowView = DirectCast(e.Row.DataItem, DataRowView)

        If gvRow("City") <> LastCity Then
            LastCity = gvRow("City")

            ' insert a new row for grouping header
            Dim MyRow As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
            Dim MyCel As New TableCell()
            'MyCel.Width = Unit.Percentage(100)
            Dim MyTable As Table = e.Row.Parent

            MyCel.ColumnSpan = MyTable.Rows(0).Controls.Count
            Dim MyLable As New Label
            MyLable.Text = "<h2>" & gvRow("City") & "</h2>"
            MyCel.Controls.Add(MyLable)
            MyRow.Cells.Add(MyCel)
            MyTable.Rows.AddAt(MyTable.Rows.Count - 1, MyRow)

        End If

    End If

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
  <Columns>
    <asp:BoundField DataField="City" HeaderText="City" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
     <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
     <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
   </Columns>
</asp:GridView>

然后按如下方式修改标记：

<asp:Repeater runat="server" ID="rptrGroups" OnItemDataBound="rptrGroups_ItemDataBound">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv">
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

protected void rptrGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        var lblGroupName = (Label)e.Item.FindControl("lblGroupName");
        GridView gv = (GridView)e.Item.FindControl("table");

        var dataTable = FetchDataWithGroupName(lblGroupName.Text); // Method that fetches data with groupname.
        gv.DataSource = dataTable;
        gv.DataBind();
    }
}

<asp:Repeater runat="server" ID="rptrGroups">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv" DataSource='<%# ((GroupedModel)Container.DataItem).TableData %>'>
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

    Dim strSQL As String = 
       "SELECT ID, FirstName, LastName, HotelName, City FROM tblHotels ORDER BY City, HotelName"

    GridView1.DataSource = Myrst(strSQL)
    GridView1.DataBind()

    If e.Row.RowType = DataControlRowType.DataRow Then

        ' if grouping = 1 then create a new row!
        Dim gvRow As DataRowView = DirectCast(e.Row.DataItem, DataRowView)

        If gvRow("City") <> LastCity Then
            LastCity = gvRow("City")

            ' insert a new row for grouping header
            Dim MyRow As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
            Dim MyCel As New TableCell()
            'MyCel.Width = Unit.Percentage(100)
            Dim MyTable As Table = e.Row.Parent

            MyCel.ColumnSpan = MyTable.Rows(0).Controls.Count
            Dim MyLable As New Label
            MyLable.Text = "<h2>" & gvRow("City") & "</h2>"
            MyCel.Controls.Add(MyLable)
            MyRow.Cells.Add(MyCel)
            MyTable.Rows.AddAt(MyTable.Rows.Count - 1, MyRow)

        End If

    End If

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
  <Columns>
    <asp:BoundField DataField="City" HeaderText="City" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
     <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
     <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
   </Columns>
</asp:GridView>

我曾经遇到过同样的问题，我需要按组对数据进行排序，并且必须在分组段中显示公共项

当然，有多种方法可以检索数据，例如，您可以获取不同的组名并将其绑定到中继器，然后在

ItemDataBound

事件上执行并获取类似以下内容的其他元素：

<asp:Repeater runat="server" ID="rptrGroups" OnItemDataBound="rptrGroups_ItemDataBound">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv">
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

protected void rptrGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        var lblGroupName = (Label)e.Item.FindControl("lblGroupName");
        GridView gv = (GridView)e.Item.FindControl("table");

        var dataTable = FetchDataWithGroupName(lblGroupName.Text); // Method that fetches data with groupname.
        gv.DataSource = dataTable;
        gv.DataBind();
    }
}

<asp:Repeater runat="server" ID="rptrGroups">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv" DataSource='<%# ((GroupedModel)Container.DataItem).TableData %>'>
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

    Dim strSQL As String = 
       "SELECT ID, FirstName, LastName, HotelName, City FROM tblHotels ORDER BY City, HotelName"

    GridView1.DataSource = Myrst(strSQL)
    GridView1.DataBind()

    If e.Row.RowType = DataControlRowType.DataRow Then

        ' if grouping = 1 then create a new row!
        Dim gvRow As DataRowView = DirectCast(e.Row.DataItem, DataRowView)

        If gvRow("City") <> LastCity Then
            LastCity = gvRow("City")

            ' insert a new row for grouping header
            Dim MyRow As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
            Dim MyCel As New TableCell()
            'MyCel.Width = Unit.Percentage(100)
            Dim MyTable As Table = e.Row.Parent

            MyCel.ColumnSpan = MyTable.Rows(0).Controls.Count
            Dim MyLable As New Label
            MyLable.Text = "<h2>" & gvRow("City") & "</h2>"
            MyCel.Controls.Add(MyLable)
            MyRow.Cells.Add(MyCel)
            MyTable.Rows.AddAt(MyTable.Rows.Count - 1, MyRow)

        End If

    End If

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
  <Columns>
    <asp:BoundField DataField="City" HeaderText="City" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
     <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
     <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
   </Columns>
</asp:GridView>

然后按如下方式修改标记：

<asp:Repeater runat="server" ID="rptrGroups" OnItemDataBound="rptrGroups_ItemDataBound">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv">
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

protected void rptrGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        var lblGroupName = (Label)e.Item.FindControl("lblGroupName");
        GridView gv = (GridView)e.Item.FindControl("table");

        var dataTable = FetchDataWithGroupName(lblGroupName.Text); // Method that fetches data with groupname.
        gv.DataSource = dataTable;
        gv.DataBind();
    }
}

<asp:Repeater runat="server" ID="rptrGroups">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv" DataSource='<%# ((GroupedModel)Container.DataItem).TableData %>'>
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

    Dim strSQL As String = 
       "SELECT ID, FirstName, LastName, HotelName, City FROM tblHotels ORDER BY City, HotelName"

    GridView1.DataSource = Myrst(strSQL)
    GridView1.DataBind()

    If e.Row.RowType = DataControlRowType.DataRow Then

        ' if grouping = 1 then create a new row!
        Dim gvRow As DataRowView = DirectCast(e.Row.DataItem, DataRowView)

        If gvRow("City") <> LastCity Then
            LastCity = gvRow("City")

            ' insert a new row for grouping header
            Dim MyRow As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
            Dim MyCel As New TableCell()
            'MyCel.Width = Unit.Percentage(100)
            Dim MyTable As Table = e.Row.Parent

            MyCel.ColumnSpan = MyTable.Rows(0).Controls.Count
            Dim MyLable As New Label
            MyLable.Text = "<h2>" & gvRow("City") & "</h2>"
            MyCel.Controls.Add(MyLable)
            MyRow.Cells.Add(MyCel)
            MyTable.Rows.AddAt(MyTable.Rows.Count - 1, MyRow)

        End If

    End If

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
  <Columns>
    <asp:BoundField DataField="City" HeaderText="City" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
     <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
     <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
   </Columns>
</asp:GridView>

我发现只使用gridview或list视图效果相当不错。但是，不要尝试使用分组功能，因为它用于在页面上而不是向下放置项目

让我们把它变得非常简单

好的，我有一个酒店列表，但我想按城市分组

因此，您可以构建如下查询：

<asp:Repeater runat="server" ID="rptrGroups" OnItemDataBound="rptrGroups_ItemDataBound">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv">
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

protected void rptrGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        var lblGroupName = (Label)e.Item.FindControl("lblGroupName");
        GridView gv = (GridView)e.Item.FindControl("table");

        var dataTable = FetchDataWithGroupName(lblGroupName.Text); // Method that fetches data with groupname.
        gv.DataSource = dataTable;
        gv.DataBind();
    }
}

<asp:Repeater runat="server" ID="rptrGroups">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv" DataSource='<%# ((GroupedModel)Container.DataItem).TableData %>'>
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

    Dim strSQL As String = 
       "SELECT ID, FirstName, LastName, HotelName, City FROM tblHotels ORDER BY City, HotelName"

    GridView1.DataSource = Myrst(strSQL)
    GridView1.DataBind()

    If e.Row.RowType = DataControlRowType.DataRow Then

        ' if grouping = 1 then create a new row!
        Dim gvRow As DataRowView = DirectCast(e.Row.DataItem, DataRowView)

        If gvRow("City") <> LastCity Then
            LastCity = gvRow("City")

            ' insert a new row for grouping header
            Dim MyRow As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
            Dim MyCel As New TableCell()
            'MyCel.Width = Unit.Percentage(100)
            Dim MyTable As Table = e.Row.Parent

            MyCel.ColumnSpan = MyTable.Rows(0).Controls.Count
            Dim MyLable As New Label
            MyLable.Text = "<h2>" & gvRow("City") & "</h2>"
            MyCel.Controls.Add(MyLable)
            MyRow.Cells.Add(MyCel)
            MyTable.Rows.AddAt(MyTable.Rows.Count - 1, MyRow)

        End If

    End If

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
  <Columns>
    <asp:BoundField DataField="City" HeaderText="City" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
     <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
     <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
   </Columns>
</asp:GridView>

好的，这将填充我们的网格视图。我们得到这个：

到目前为止，有两行代码

但是，我们想按城市分组

因此，在forms类级别，添加简单变量：

Public Class HotelGroupGrid
    Inherits System.Web.UI.Page

    Dim LastCity As String    <----- this one

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If IsPostBack = False Then
            LastCity = ""
            Call LoadGrid()
        End If
    End Sub

Public Class HotelGroupGrid酒店
继承System.Web.UI.Page
Dim LastCity As String我发现只使用gridview或list视图效果相当不错。但是，不要尝试使用分组功能，因为它用于在页面上而不是向下放置项目
让我们把它变得非常简单
好的，我有一个酒店列表，但我想按城市分组
因此，您可以构建如下查询：
<asp:Repeater runat="server" ID="rptrGroups" OnItemDataBound="rptrGroups_ItemDataBound">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv">
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

protected void rptrGroups_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item)
    {
        var lblGroupName = (Label)e.Item.FindControl("lblGroupName");
        GridView gv = (GridView)e.Item.FindControl("table");

        var dataTable = FetchDataWithGroupName(lblGroupName.Text); // Method that fetches data with groupname.
        gv.DataSource = dataTable;
        gv.DataBind();
    }
}

<asp:Repeater runat="server" ID="rptrGroups">
    <ItemTemplate>
        <asp:Label runat="server" ID="lblGroupName" Text='<%# Eval("GroupName") %>' />

        <asp:GridView runat="server" ID="gv" DataSource='<%# ((GroupedModel)Container.DataItem).TableData %>'>
        </asp:GridView>
    </ItemTemplate>
</asp:Repeater>

    Dim strSQL As String = 
       "SELECT ID, FirstName, LastName, HotelName, City FROM tblHotels ORDER BY City, HotelName"

    GridView1.DataSource = Myrst(strSQL)
    GridView1.DataBind()

    If e.Row.RowType = DataControlRowType.DataRow Then

        ' if grouping = 1 then create a new row!
        Dim gvRow As DataRowView = DirectCast(e.Row.DataItem, DataRowView)

        If gvRow("City") <> LastCity Then
            LastCity = gvRow("City")

            ' insert a new row for grouping header
            Dim MyRow As New GridViewRow(-1, -1, DataControlRowType.DataRow, DataControlRowState.Normal)
            Dim MyCel As New TableCell()
            'MyCel.Width = Unit.Percentage(100)
            Dim MyTable As Table = e.Row.Parent

            MyCel.ColumnSpan = MyTable.Rows(0).Controls.Count
            Dim MyLable As New Label
            MyLable.Text = "<h2>" & gvRow("City") & "</h2>"
            MyCel.Controls.Add(MyLable)
            MyRow.Cells.Add(MyCel)
            MyTable.Rows.AddAt(MyTable.Rows.Count - 1, MyRow)

        End If

    End If

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID">
  <Columns>
    <asp:BoundField DataField="City" HeaderText="City" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="ID" HeaderText="ID" InsertVisible="False" ReadOnly="True" SortExpression="ID" />
    <asp:BoundField DataField="FirstName" HeaderText="FirstName" SortExpression="FirstName" />
     <asp:BoundField DataField="LastName" HeaderText="LastName" SortExpression="LastName" />
     <asp:BoundField DataField="HotelName" HeaderText="HotelName" SortExpression="HotelName" />
   </Columns>
</asp:GridView>

好的，这将填充我们的网格视图。我们得到这个：

到目前为止，有两行代码
但是，我们想按城市分组
因此，在forms类级别，添加简单变量：
Public Class HotelGroupGrid
    Inherits System.Web.UI.Page

    Dim LastCity As String    <----- this one

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If IsPostBack = False Then
            LastCity = ""
            Call LoadGrid()
        End If
    End Sub

Public Class HotelGroupGrid酒店
继承System.Web.UI.Page
Dim LastCity作为字符串我建议您使用listview或grid视图。不需要中继器。对于标题，只需将该行作为单独的行添加到网格中，然后在item data bind事件中，只需隐藏或显示另一行作为分组标题。GroupByExpressions和GroupByFields使这一切进展迅速。Jamshaid的答案是基于重复的，而Albert在listview上的帖子是我从未考虑过的。。。看起来很简单。我建议您使用列表视图或网格视图。不需要中继器。对于标题，只需将该行作为单独的行添加到网格中，然后在item data bind事件中，只需隐藏或显示另一行作为分组标题。GroupByExpressions和GroupByFields使这一切进展迅速。Jamshaid的答案是基于重复的，而Albert在listview上的帖子是我从未考虑过的。。。看起来真的很容易。