GridView.HeaderRow Eigenschaft

  • Referenz

Definition

Namespace:
System.Web.UI.WebControls
Assembly:
System.Web.dll

Ruft ein GridViewRow-Objekt ab, das die Headerzeile in einem GridView-Steuerelement darstellt.

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

Eigenschaftswert

GridViewRow

Ein GridViewRow-Objekt, das die Headerzeile in einem GridView-Steuerelement darstellt.

Attribute
BrowsableAttribute

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie die HeaderRow -Eigenschaft verwendet wird, um die Schriftfarbe der Kopfzeile basierend auf der Sortierrichtung programmgesteuert zu ändern.


<%@ 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 CustomersGridView_DataBound(Object sender, EventArgs e)
  {
    
    // Get the header row.
    GridViewRow headerRow = CustomersGridView.HeaderRow;   
    
    // Get the footer row.
    GridViewRow footerRow = CustomersGridView.FooterRow; 

    // Set the font color of the header and footer rows
    // based on the sort direction. 
    switch (CustomersGridView.SortDirection)
    {
      case SortDirection.Ascending:
        headerRow.ForeColor = System.Drawing.Color.Green;
        footerRow.ForeColor = System.Drawing.Color.Green;
        break;
      case SortDirection.Descending:
        headerRow.ForeColor = System.Drawing.Color.Red;
        footerRow.ForeColor = System.Drawing.Color.Red;
        break;
      default:
        headerRow.ForeColor = System.Drawing.Color.Black;
        footerRow.ForeColor = System.Drawing.Color.Black;
        break;
    }

    // Display the sort order in the footer row.
    footerRow.Cells[0].Text = "Sort Order = " + CustomersGridView.SortDirection.ToString();
      
  }
    
</script>

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

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        allowsorting="true"
        allowpaging="true" 
        showheader="true"
        showfooter="true"
        ondatabound="CustomersGridView_DataBound"    
        runat="server">
        
        <headerstyle backcolor="LightCyan"
          forecolor="MediumBlue"/>
                    
        <footerstyle backcolor="LightCyan"
          forecolor="MediumBlue"/>
                        
      </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="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
        
    </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 CustomersGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs)
      
    ' Get the header row.
    Dim headerRow As GridViewRow = CustomersGridView.HeaderRow
    
    ' Get the footer row.
    Dim footerRow As GridViewRow = CustomersGridView.FooterRow

    ' Set the font color of the header and footer rows
    ' based on the sort direction. 
    Select Case CustomersGridView.SortDirection

      Case SortDirection.Ascending
        headerRow.ForeColor = System.Drawing.Color.Green
        footerRow.ForeColor = System.Drawing.Color.Green
      Case SortDirection.Descending
        headerRow.ForeColor = System.Drawing.Color.Red
        footerRow.ForeColor = System.Drawing.Color.Red
      Case Else
        headerRow.ForeColor = System.Drawing.Color.Black
        footerRow.ForeColor = System.Drawing.Color.Black
        
    End Select

    ' Display the sort order in the footer row.
    footerRow.Cells(0).Text = "Sort Order = " & CustomersGridView.SortDirection.ToString()
      
  End Sub
    
</script>

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

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        emptydatatext="No data available." 
        allowsorting="true"
        allowpaging="true" 
        showheader="true"
        showfooter="true"
        ondatabound="CustomersGridView_DataBound"    
        runat="server">
        
        <headerstyle backcolor="LightCyan"
          forecolor="MediumBlue"/>
                    
        <footerstyle backcolor="LightCyan"
          forecolor="MediumBlue"/>
                        
      </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="CustomersSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>
        
    </form>
  </body>
</html>

Hinweise

Verwenden Sie die HeaderRow -Eigenschaft, um programmgesteuert auf das GridViewRow Objekt zuzugreifen, das die Headerzeile in einem GridView Steuerelement darstellt.

Hinweis

Die HeaderRow -Eigenschaft ist erst verfügbar, nachdem das GridView -Steuerelement die Headerzeile im RowCreated -Ereignis erstellt hat.

Diese Eigenschaft wird häufig verwendet, wenn Sie die Headerzeile programmgesteuert bearbeiten müssen, z. B. beim Hinzufügen von benutzerdefiniertem Inhalt. Jede Änderung der HeaderRow Eigenschaft muss nach dem Rendern des GridView Steuerelements ausgeführt werden. Andernfalls überschreibt das GridView Steuerelement alle Änderungen.

Gilt für:

Weitere Informationen