GridView.TopPagerRow Vlastnost

Definice

Získá GridViewRow objekt, který představuje horní řádek pager v ovládacím prvku GridView .

public:
 virtual property System::Web::UI::WebControls::GridViewRow ^ TopPagerRow { System::Web::UI::WebControls::GridViewRow ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.GridViewRow TopPagerRow { get; }
[<System.ComponentModel.Browsable(false)>]
member this.TopPagerRow : System.Web.UI.WebControls.GridViewRow
Public Overridable ReadOnly Property TopPagerRow As GridViewRow

Hodnota vlastnosti

A GridViewRow , který představuje horní řádek pageru v ovládacím prvku.

Atributy

Příklady

Následující příklad ukazuje, jak použít TopPagerRow vlastnost pro přístup k hornímu řádku pager v ovládacím prvku GridView . Vlastnost TopPagerRow se používá k načtení ovládacího prvku DropDownList z řádku stránkovače.


<%@ Page language="C#" %>

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

  void PageDropDownList_SelectedIndexChanged(Object sender, EventArgs e)
  {

    // Retrieve the pager row.
    GridViewRow pagerRow = CustomersGridView.TopPagerRow;
   
    // Retrieve the PageDropDownList DropDownList from the pager row.
    DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");

    // Set the PageIndex property to display that page selected by the user.
    CustomersGridView.PageIndex = pageList.SelectedIndex;

  }

  void CustomersGridView_DataBound(Object sender, EventArgs e)
  {
    
    // Retrieve the PagerRow.
    GridViewRow pagerRow = CustomersGridView.TopPagerRow;
    
    // Retrieve the DropDownList and Label controls from the row.
    DropDownList pageList = (DropDownList)pagerRow.Cells[0].FindControl("PageDropDownList");
    Label pageLabel = (Label)pagerRow.Cells[0].FindControl("CurrentPageLabel");
        
    if(pageList != null)
    {
        
      // Create the values for the DropDownList control based on 
      // the  total number of pages required to display the data
      // source.
      for(int i=0; i<CustomersGridView.PageCount; i++)
      {
            
        // Create a ListItem object to represent a page.
        int pageNumber = i + 1;
        ListItem item = new ListItem(pageNumber.ToString());         
            
        // If the ListItem object matches the currently selected
        // page, flag the ListItem object as being selected. Because
        // the DropDownList control is recreated each time the pager
        // row gets created, this will persist the selected item in
        // the DropDownList control.   
        if(i==CustomersGridView.PageIndex)
        {
          item.Selected = true;
        }
            
        // Add the ListItem object to the Items collection of the 
        // DropDownList.
        pageList.Items.Add(item);
                
      }
        
    }
        
    if(pageLabel != null)
    {
        
      // Calculate the current page number.
      int currentPage = CustomersGridView.PageIndex + 1;     
        
      // Update the Label control with the current page information.
      pageLabel.Text = "Page " + currentPage.ToString() +
        " of " + CustomersGridView.PageCount.ToString();
        
    }    
    
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView TopPagerRow Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView TopPagerRow Example</h3>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource"   
        autogeneratecolumns="true"
        allowpaging="true"
        ondatabound="CustomersGridView_DataBound"  
        runat="server">
              
        <pagerstyle forecolor="Blue"
          backcolor="LightBlue"/>
          
        <pagersettings position="Top"/>
              
        <pagertemplate>
          
          <table width="100%">                    
            <tr>                        
              <td style="width:70%">
                          
                <asp:label id="MessageLabel"
                  forecolor="Blue"
                  text="Select a page:" 
                  runat="server"/>
                <asp:dropdownlist id="PageDropDownList"
                  autopostback="true"
                  onselectedindexchanged="PageDropDownList_SelectedIndexChanged" 
                  runat="server"/>
                      
              </td>   
                      
              <td style="width:70%" align="right">
                      
                <asp:label id="CurrentPageLabel"
                  forecolor="Blue"
                  runat="server"/>
                      
              </td>
                                            
            </tr>                    
          </table>
          
        </pagertemplate> 
          
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

<%@ Page language="VB" %>

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

  Sub PageDropDownList_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)
    
    ' Retrieve the pager row.
    Dim pagerRow As GridViewRow = CustomersGridView.TopPagerRow
    
    ' Retrieve the PageDropDownList DropDownList from the bottom pager row.
    Dim pageList As DropDownList = CType(pagerRow.Cells(0).FindControl("PageDropDownList"), DropDownList)
        
    ' Set the PageIndex property to display that page selected by the user.
    CustomersGridView.PageIndex = pageList.SelectedIndex
    
  End Sub
    
  Sub CustomersGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
    
    ' Get the PagerRow.
    Dim pagerRow As GridViewRow = CustomersGridView.TopPagerRow
    
    ' Retrieve the DropDownList and Label controls from the row.
    Dim pageList As DropDownList = CType(pagerRow.Cells(0).FindControl("PageDropDownList"), DropDownList)
    Dim pageLabel As Label = CType(pagerRow.Cells(0).FindControl("CurrentPageLabel"), Label)
        
    If Not pageList Is Nothing Then
        
      ' Create the values for the DropDownList control based on 
      ' the  total number of pages required to display the data
      ' source.
      Dim i As Integer
            
      For i = 0 To CustomersGridView.PageCount - 1
            
        ' Create a ListItem object to represent a page.
        Dim pageNumber As Integer = i + 1
        Dim item As ListItem = New ListItem(pageNumber.ToString())
            
        ' If the ListItem object matches the currently selected
        ' page, flag the ListItem object as being selected. Because
        ' the DropDownList control is recreated each time the pager
        ' row gets created, this will persist the selected item in
        ' the DropDownList control.   
        If i = CustomersGridView.PageIndex Then
          
          item.Selected = True
                
        End If
            
        ' Add the ListItem object to the Items collection of the 
        ' DropDownList.
        pageList.Items.Add(item)
                
      Next i
        
    End If
        
    If Not pageLabel Is Nothing Then
        
      ' Calculate the current page number.
      Dim currentPage As Integer = CustomersGridView.PageIndex + 1
        
      ' Update the Label control with the current page information.
      pageLabel.Text = "Page " & currentPage.ToString() & _
          " of " & CustomersGridView.PageCount.ToString()
        
    End If
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>GridView TopPagerRow Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>GridView TopPagerRow Example</h3>

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSqlDataSource"   
        autogeneratecolumns="true"
        allowpaging="true"
        ondatabound="CustomersGridView_DataBound"  
        runat="server">
              
        <pagerstyle forecolor="Blue"
          backcolor="LightBlue"/>
          
        <pagersettings position="Top"/>
              
        <pagertemplate>
          
          <table width="100%">                    
            <tr>                        
              <td style="width:70%">
                          
                <asp:label id="MessageLabel"
                  forecolor="Blue"
                  text="Select a page:" 
                  runat="server"/>
                <asp:dropdownlist id="PageDropDownList"
                  autopostback="true"
                  onselectedindexchanged="PageDropDownList_SelectedIndexChanged" 
                  runat="server"/>
                      
              </td>   
                      
              <td style="width:70%" align="right">
                      
                <asp:label id="CurrentPageLabel"
                  forecolor="Blue"
                  runat="server"/>
                      
              </td>
                                            
            </tr>                    
          </table>
          
        </pagertemplate> 
          
      </asp:gridview>
            
      <!-- This example uses Microsoft SQL Server and connects  -->
      <!-- to the Northwind sample database. Use an ASP.NET     -->
      <!-- expression to retrieve the connection string value   -->
      <!-- from the Web.config file.                            -->
      <asp:sqldatasource id="CustomersSqlDataSource"  
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
        runat="server">
      </asp:sqldatasource>
            
    </form>
  </body>
</html>

Poznámky

Pokud je stránkování povolené (nastavením AllowPaging vlastnosti na true), v ovládacím prvku se automaticky zobrazí GridView další řádek s názvem řádek pageru. Řádek stránkovače obsahuje ovládací prvky, které uživateli umožňují přejít na další stránky a dají se zobrazit nahoře, dole nebo v horní i dolní části ovládacího prvku. TopPagerRow Pomocí vlastnosti můžete programově přistupovat k objektuGridViewRow, který představuje horní řádek stránkovače v ovládacím GridView prvku.

Poznámka

Vlastnost TopPagerRow je k dispozici až po vytvoření GridView horního řádku pageru v RowCreated události ovládacím prvku.

Tato vlastnost se běžně používá, když potřebujete programově manipulovat s horním řádkem stránkovače, například při přidávání vlastního obsahu. Všechny změny TopPagerRow vlastnosti musí být provedeny po GridView vykreslení ovládacího prvku, GridView jinak ovládací prvek přepíše všechny změny.

Platí pro

Viz také