GridView.HeaderRow Propiedad

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.WebControls
Ensamblado:
System.Web.dll

Obtiene un objeto GridViewRow que representa la fila de encabezado de un control GridView.

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

Valor de propiedad

GridViewRow

GridViewRow que representa la fila de encabezado de un control GridView.

Atributos
BrowsableAttribute

Ejemplos

En el ejemplo siguiente se muestra cómo usar la HeaderRow propiedad para cambiar mediante programación el color de fuente de la fila de encabezado en función de la dirección de ordenación.


<%@ 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>

Comentarios

Utilice la HeaderRow propiedad para tener acceso mediante programación al GridViewRow objeto que representa la fila de encabezado de un GridView control .

Nota

La HeaderRow propiedad solo está disponible después de que el GridView control cree la fila de encabezado en el RowCreated evento .

Esta propiedad se usa normalmente cuando es necesario manipular mediante programación la fila de encabezado, por ejemplo, al agregar contenido personalizado. Cualquier modificación de la HeaderRow propiedad debe realizarse después de que se haya representado el GridView control; de lo contrario, el GridView control sobrescribirá los cambios.

Se aplica a

Consulte también