DataGrid.AllowPaging 屬性

  • 參考

定義

命名空間:
System.Web.UI.WebControls
組件:
System.Web.dll

取得或設定值，指出是否啟用分頁。

public:
 virtual property bool AllowPaging { bool get(); void set(bool value); };
public virtual bool AllowPaging { get; set; }
member this.AllowPaging : bool with get, set
Public Overridable Property AllowPaging As Boolean

屬性值

Boolean

如果啟用分頁，則為 true，否則為 false。 預設值是 false。

範例

下列程式碼範例示範如何使用 AllowPaging 屬性來啟用分頁。

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="C#" runat="server">
 
   DataTable Cart;
   DataView CartView;
 
   ICollection CreateDataSource() 
   {
      DataTable dt = new DataTable();
      DataRow dr;
 
      dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
      dt.Columns.Add(new DataColumn("StringValue", typeof(string)));
      dt.Columns.Add(new DataColumn("CurrencyValue", typeof(double)));
 
      for (int i = 0; i < 100; i++) 
      {
         dr = dt.NewRow();
 
         dr[0] = i;
         dr[1] = "Item " + i.ToString();
         dr[2] = 1.23 * (i+1); 
         dt.Rows.Add(dr);
      }
 
      DataView dv = new DataView(dt);
      return dv;
   }
 
   void Page_Load(Object sender, EventArgs e) 
   {
 
      if (!IsPostBack) 
      {
         // Need to load this data only once.
         ItemsGrid.DataSource = CreateDataSource();
         ItemsGrid.DataBind();
      }
 
      if (CheckBox1.Checked)
         ItemsGrid.PagerStyle.Mode = PagerMode.NumericPages;
      else
         ItemsGrid.PagerStyle.Mode = PagerMode.NextPrev;

   }
 
   void Grid_Change(Object sender, DataGridPageChangedEventArgs e) 
   {
 
      // Set CurrentPageIndex to the page the user clicked.
      ItemsGrid.CurrentPageIndex = e.NewPageIndex;

      // Rebind the data. 
      ItemsGrid.DataSource = CreateDataSource();
      ItemsGrid.DataBind();
      
   }
 
 
</script>
 
<head runat="server">
    <title>DataGrid Paging Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

   <h3>DataGrid Paging Example</h3>
 
   <asp:DataGrid id="ItemsGrid" runat="server"
        BorderColor="black"
        BorderWidth="1"
        CellPadding="3"
        AllowPaging="true"
        AutoGenerateColumns="false"        
        OnPageIndexChanged="Grid_Change">
 
      <HeaderStyle BackColor="#00aaaa">
      </HeaderStyle>
 
      <PagerStyle Mode="NextPrev">
      </PagerStyle> 

      <Columns>

         <asp:BoundColumn 
              HeaderText="Number" 
              DataField="IntegerValue"/>
 
        <asp:BoundColumn 
              HeaderText="Item" 
              DataField="StringValue"/>

         <asp:BoundColumn 
              HeaderText="Price" 
              DataField="CurrencyValue" 
              DataFormatString="{0:c}">
 
            <ItemStyle HorizontalAlign="right">
            </ItemStyle>
     
         </asp:BoundColumn>

      </Columns>

   </asp:DataGrid>

   <br />

   <asp:CheckBox id="CheckBox1" 
                 Text="Show page navigation"
                 AutoPostBack="true"
                 runat="server"/>
 
   </form>
 
</body>
</html>

<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Import Namespace="System.Data" %>
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<script language="VB" runat="server">
 
        Dim Cart As DataTable
        Dim CartView As DAtaView

        Function CreateDataSource() As ICollection
            Dim dt As New DataTable()
            Dim dr As DataRow
            
            dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
            dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
            dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
            
            Dim i As Integer
            For i = 0 To 99
                dr = dt.NewRow()
                
                dr(0) = i
                dr(1) = "Item " + i.ToString()
                dr(2) = 1.23 *(i + 1)
                dt.Rows.Add(dr)
            Next i
            
            Dim dv As New DataView(dt)
            Return dv
        End Function 'CreateDataSource


        Sub Page_Load(sender As Object, e As EventArgs)
            
            If Not IsPostBack Then
                ' Need to load this data only once.
                ItemsGrid.DataSource = CreateDataSource()
                ItemsGrid.DataBind()
            End If
            
            If CheckBox1.Checked Then
                ItemsGrid.PagerStyle.Mode = PagerMode.NumericPages
            Else
                ItemsGrid.PagerStyle.Mode = PagerMode.NextPrev
            End If 
        End Sub 'Page_Load


        Sub Grid_Change(sender As Object, e As DataGridPageChangedEventArgs)
            
            ' Set CurrentPageIndex to the page the user clicked.
            ItemsGrid.CurrentPageIndex = e.NewPageIndex
            
            ' Rebind the data. 
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
        End Sub 'Grid_Change  
</script>
 
<head runat="server">
    <title>DataGrid Paging Example</title>
</head>
<body>
 
   <form id="form1" runat="server">

   <h3>DataGrid Paging Example</h3>
 
   <asp:DataGrid id="ItemsGrid" runat="server"
        BorderColor="black"
        BorderWidth="1"
        CellPadding="3"
        AllowPaging="true"
        AutoGenerateColumns="false"        
        OnPageIndexChanged="Grid_Change">
 
      <HeaderStyle BackColor="#00aaaa">
      </HeaderStyle>
 
      <PagerStyle Mode="NextPrev">
      </PagerStyle> 

      <Columns>

         <asp:BoundColumn 
              HeaderText="Number" 
              DataField="IntegerValue"/>
 
        <asp:BoundColumn 
              HeaderText="Item" 
              DataField="StringValue"/>

         <asp:BoundColumn 
              HeaderText="Price" 
              DataField="CurrencyValue" 
              DataFormatString="{0:c}">
 
            <ItemStyle HorizontalAlign="right">
            </ItemStyle>
     
         </asp:BoundColumn>

      </Columns>

   </asp:DataGrid>

   <br />

   <asp:CheckBox id="CheckBox1" 
                 Text="Show page navigation"
                 AutoPostBack="true"
                 runat="server"/>
 
   </form>
 
</body>
</html>

<%@ Page Language="C#" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    private ICollection CreateDataSource()
    {
        // Create sample data for the DataGrid control.
        DataTable dt = new DataTable();
        DataRow dr;

        // Define the columns of the table.
        dt.Columns.Add(new DataColumn("IntegerValue", typeof(Int32)));
        dt.Columns.Add(new DataColumn("StringValue", typeof(String)));
        dt.Columns.Add(new DataColumn("CurrencyValue", typeof(Double)));

        // Populate the table with sample values.
        for (int i = 0; i <= 100; i++) 
        {
            dr = dt.NewRow();
            dr[0] = i;
            dr[1] = "Item " + i.ToString();
            dr[2] = 1.23 * (i + 1);

            dt.Rows.Add(dr);
        }
        DataView dv = new DataView(dt);
        return dv;
    }

    private void Page_Load(Object sender, EventArgs e)
    { 
        // Load sample data only once, when the page is first loaded.
        if (!IsPostBack)
        { 
            ItemsGrid.DataSource = CreateDataSource();
            ItemsGrid.DataBind();
        }
    }

    private void Check_Change(Object sender, EventArgs e)
    {
        // Allow or prevent paging depending 
        // on the user's selection.
        ItemsGrid.AllowPaging = AllowPagingCheckBox.Checked;

        // Rebind the data to refresh the DataGrid control. 
        ItemsGrid.DataSource = CreateDataSource();
        ItemsGrid.DataBind();
    }

    private void Grid_Change(Object sender, DataGridPageChangedEventArgs e) 
    {
        // For the DataGrid control to navigate to the correct page when
        // paging is allowed, the CurrentPageIndex property must be updated
        // programmatically. This process is usually accomplished in the
        // event-handling method for the PageIndexChanged event.

        // Set CurrentPageIndex to the page the user clicked.
        ItemsGrid.CurrentPageIndex = e.NewPageIndex;

        // Rebind the data to refresh the DataGrid control. 
        ItemsGrid.DataSource = CreateDataSource();
        ItemsGrid.DataBind();
    }
</script>
 
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>DataGrid AllowPaging Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
 
    <h3>DataGrid AllowPaging Example</h3>

    <p>Select whether to allow paging in the DataGrid control.<br />
       <asp:CheckBox id="AllowPagingCheckBox"
            Text="Allow paging"
            AutoPostBack="True"
            Checked="True"
            OnCheckedChanged="Check_Change"
            runat="server" />
    </p>
    <hr />
    <asp:Label runat="server" 
        AssociatedControlID="ItemsGrid" 
        Font-Bold="true">Product List</asp:Label>
    <asp:DataGrid id="ItemsGrid" runat="server"
        BorderColor="Gray"
        BorderWidth="1"
        CellPadding="3"
        AutoGenerateColumns="False"
        UseAccessibleHeader="true"
        PageSize="10"
        AllowPaging="True"
        OnPageIndexChanged="Grid_Change">

        <HeaderStyle BackColor="LightBlue" />
        <Columns>
            <asp:BoundColumn DataField="IntegerValue" 
                 SortExpression="IntegerValue"
                 ItemStyle-HorizontalAlign="center"
                 HeaderText="Item" />

            <asp:BoundColumn DataField="StringValue" 
                HeaderText="Description" 
                ItemStyle-HorizontalAlign="left"
                SortExpression="StringValue" />

            <asp:BoundColumn DataField="CurrencyValue" 
                 HeaderText="Price"
                 SortExpression="CurrencyValue"
                 DataFormatString="{0:c}" />

        </Columns>
        <ItemStyle HorizontalAlign="Right" />
    </asp:DataGrid>

    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>
<%@ Import Namespace="System.Data" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
    Function CreateDataSource() As ICollection
        ' Create sample data for the DataGrid control.
        Dim dt As DataTable = New DataTable()
        Dim dr As DataRow
 
        ' Define the columns of the table.
        dt.Columns.Add(New DataColumn("IntegerValue", GetType(Int32)))
        dt.Columns.Add(New DataColumn("StringValue", GetType(String)))
        dt.Columns.Add(New DataColumn("CurrencyValue", GetType(Double)))
 
        ' Populate the table with sample values.
        Dim i As Integer
        For i = 0 To 100
            dr = dt.NewRow()
            dr(0) = i
            dr(1) = "Item " & i.ToString()
            dr(2) = 1.23 * (i + 1)
            dt.Rows.Add(dr)
        Next i
 
        Dim dv As DataView = New DataView(dt)
        Return dv
    End Function
 
    Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
        ' Load sample data only once, when the page is first loaded.
        If Not IsPostBack Then
            ItemsGrid.DataSource = CreateDataSource()
            ItemsGrid.DataBind()
        End If
    End Sub

    Sub Check_Change(ByVal sender As Object, ByVal e As EventArgs)
        ' Allow or prevent paging depending on the user's selection.
        ItemsGrid.AllowPaging = AllowPagingCheckBox.Checked()

        ' Rebind the data to refresh the DataGrid control. 
        ItemsGrid.DataSource = CreateDataSource()
        ItemsGrid.DataBind()
    End Sub

    Sub Grid_Change(ByVal sender As Object, ByVal e As DataGridPageChangedEventArgs)
        ' For the DataGrid control to navigate to the correct page when
        ' paging is allowed, the CurrentPageIndex property must be updated
        ' programmatically. This process is usually accomplished in the
        ' event-handling method for the PageIndexChanged event.

        ' Set CurrentPageIndex to the page the user clicked.
        ItemsGrid.CurrentPageIndex = e.NewPageIndex

        ' Rebind the data to refresh the DataGrid control. 
        ItemsGrid.DataSource = CreateDataSource()
        ItemsGrid.DataBind()
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head2" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    <h3>DataGrid AllowPaging Example</h3>

    <p>Select whether to allow paging in the DataGrid control.<br />
       <asp:CheckBox id="AllowPagingCheckBox"
            Text="Allow paging"
            AutoPostBack="True"
            Checked="True"
            OnCheckedChanged="Check_Change"
            runat="server" />
    </p>
    <hr />
    <asp:Label ID="Label1" runat="server" 
        AssociatedControlID="ItemsGrid" 
        Font-Bold="true">Product List</asp:Label>
    <asp:DataGrid id="ItemsGrid" runat="server"
        BorderColor="Gray"
        BorderWidth="1"
        CellPadding="3"
        UseAccessibleHeader="true"
        AutoGenerateColumns="False"
        PageSize="10"
        AllowPaging="True"
        OnPageIndexChanged="Grid_Change">

        <HeaderStyle BackColor="LightBlue" />
        <Columns>
            <asp:BoundColumn DataField="IntegerValue" 
                 SortExpression="IntegerValue"
                 ItemStyle-HorizontalAlign="center"
                 HeaderText="Item" />

            <asp:BoundColumn DataField="StringValue" 
                HeaderText="Description" 
                ItemStyle-HorizontalAlign="left"
                SortExpression="StringValue" />

            <asp:BoundColumn DataField="CurrencyValue" 
                 HeaderText="Price"
                 SortExpression="CurrencyValue"
                 DataFormatString="{0:c}" />

        </Columns>
        <ItemStyle HorizontalAlign="Right" />
    </asp:DataGrid>

    </div>
    </form>
</body>
</html>

備註

分頁可讓您在頁面區段中顯示控制項的內容 DataGrid 。 頁面上的專案數目取決於 PageSize 屬性。 如果未為 PageSize 屬性指定任何值， DataGrid 控制項會在頁面上顯示 10 個專案。

根據預設，分頁會停用。 若要啟用分頁，請將此屬性設定為 true ，並提供程式 PageIndexChanged 代碼來處理事件。

事件的一般邏輯 PageIndexChanged 是將 CurrentPageIndex 屬性設定為您想要顯示之頁面的索引，然後使用 DataBind 方法將資料系結至 DataGrid 控制項。

注意

事件處理常式會 DataGridPageChangedEventArgs 以 參數的形式接收 物件。 您可以使用 NewPageIndex 此參數的 屬性，從控制項的頁面選取專案 DataGrid ，判斷使用者選取的頁面索引。

使用標準分頁時， DataGrid 控制項會假設資料來源包含要顯示的所有專案。 DataGrid控制項會根據 屬性所指定的頁面索引，以及屬性所指定的 CurrentPageIndexPageSize 頁面上專案專案數，計算顯示頁面上專案的索引。

一般而言，每次頁面控制項時都會載入 DataGrid 包含要顯示之所有專案的資料來源。 當資料來源非常大時，這可能會耗用許多資源。 自訂分頁可讓您只載入顯示單一頁面所需的資料區段。 如需自訂分頁的其他資訊，請參閱 AllowCustomPaging 屬性。

適用於

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