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GridViewSortEventArgs.SortDirection Propriedade

  • Referência

Definição

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

Obtém ou define a direção na qual o controle GridView será classificado.

public:
 property System::Web::UI::WebControls::SortDirection SortDirection { System::Web::UI::WebControls::SortDirection get(); void set(System::Web::UI::WebControls::SortDirection value); };
public System.Web.UI.WebControls.SortDirection SortDirection { get; set; }
member this.SortDirection : System.Web.UI.WebControls.SortDirection with get, set
Public Property SortDirection As SortDirection

Valor da propriedade

SortDirection

Um dos valores de SortDirection.

Exemplos

O exemplo a seguir demonstra como usar a SortDirection propriedade para determinar a direção na qual classificar um GridView controle. Se o usuário tentar classificar em ordem decrescente, a operação de classificação será cancelada.


<%@ 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_Sorting(Object sender, GridViewSortEventArgs e)
  {
    // By default, the sort order toggles when the user clicks 
    // the same sort button repeatedly. For this example, cancel
    // the sort operation if the user attempts to sort in descending
    // order.
    if (e.SortDirection == SortDirection.Descending)
    {
      e.Cancel = true;
      Message.Text = "Sorting in descending order is not supported.";
    }
    else
    {
      Message.Text = "";
    }
  }
  
</script>

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

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        allowpaging="true"
        emptydatatext="No data available." 
        allowsorting="true"
        onsorting="CustomersGridView_Sorting"
        runat="server">
                
      </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_Sorting(ByVal sender As Object, ByVal e As GridViewSortEventArgs)
  
    ' By default, the sort order toggles when the user clicks 
    ' the same sort button repeatedly. For this example, cancel
    ' the sort operation if the user attempts to sort in descending
    ' order.
    If e.SortDirection = SortDirection.Descending Then
    
      e.Cancel = True
      Message.Text = "Sorting in descending order is not supported."
    
    Else
    
      Message.Text = ""
    
    End If
      
  End Sub
  
</script>

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

      <asp:label id="Message"
        forecolor="Red"
        runat="server"/>
                
      <br/>  

      <asp:gridview id="CustomersGridView" 
        datasourceid="CustomersSource" 
        autogeneratecolumns="true"
        allowpaging="true"
        emptydatatext="No data available." 
        allowsorting="true"
        onsorting="CustomersGridView_Sorting"
        runat="server">
                
      </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>

Comentários

Quando o Sorting evento é gerado, você pode usar a SortDirection propriedade para determinar a ordem na qual o GridView controle classificará seus itens (com base na expressão de classificação) quando a operação de classificação for executada. Como o Sorting evento ocorre antes da operação de classificação, você também pode usar a SortDirection propriedade para definir programaticamente a direção de classificação.

Aplica-se a

Confira também