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CommandEventArgs Classe

.NET Framework 2.0

Outras versões

Provides data for the Command event.

Namespace: System.Web.UI.WebControls
Assembly: System.Web (em System.Web. dll)

Sintaxe

C++

JScript

[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class CommandEventArgs : EventArgs

Comentários

The Command event is raised when a Button or ImageButton control is clicked.

The CommandEventArgs object contains data about the Command event that can be accessed in the event handler.Using the properties available in the CommandEventArgs class, you can determine the name of the command to perform, such as Sort, in addition to an optional argument that supplements the command, such as Ascending.

For a list of initial property values for an instance of CommandEventArgs, see the CommandEventArgs constructor.

For more information about handling events, see Consumindo Eventos.

Exemplos

The following example demonstrates how to access the properties in CommandEventArgs to determine the command to perform.This example specifies the event handler declaratively, using the OnClick property of the Button control.

<%@ Page Language= AutoEventWireup= %>

<!DOCTYPE html PUBLIC "-
    "http:
<html xmlns="http:
<head runat=>
    <title>Button CommandName Example</title>
<script runat=>

       CommandBtn_Click(Object sender, CommandEventArgs e) 
      {

         (e.CommandName)
         {

             :

               
               Sort_List((String)e.CommandArgument);
               ;

             :

               
               Message.Text = ;

               
               ((String)e.CommandArgument == )
               {
                  
                  Message.Text += ;
               }
               
               {
                  
                  Message.Text += ;
               }                
               ;

            :

               
               Message.Text = ;
               ; 

         }

      }

       Sort_List(string commandArgument)
      {

         (commandArgument)
         {

             :

               
               Message.Text = ;
               ;

             :

               
               Message.Text = ;
               ;

            :

               
               Message.Text = ;
               ;

         }

      }

   </script>

</head>

<body>

   <form id= runat=>

      <h3>Button CommandName Example</h3>

      Click  one of the command buttons.

      <br /><br />

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           OnCommand= 
           runat=/>

      &nbsp;

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           OnCommand= 
           runat=/>

      <br /><br />

      <asp:Button id=
           Text=
           CommandName=
           OnCommand= 
           runat=/>

      &nbsp;

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           OnCommand= 
           runat=/>

      &nbsp;

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           OnCommand= 
           runat=/>

      <br /><br />

      <asp:Label id= runat=/>

   </form>

</body>
</html>

The following code example demonstrates how to specify the event handler and programmatically add it to the event in the Page_Load method.

<%@ Page Language= AutoEventWireup= %>

<!DOCTYPE html PUBLIC "-
    "http:
<html xmlns="http:
<head runat=>
    <title>Button CommandName Example</title>
<script runat=>

       CommandBtn_Click(Object sender, CommandEventArgs e) 
      {

         (e.CommandName)
         {

             :

               
               Sort_List((String)e.CommandArgument);
               ;

             :

               
               Message.Text = ;

               
               ((String)e.CommandArgument == )
               {
                  
                  Message.Text += ;
               }
               
               {
                  
                  Message.Text += ;
               }                
               ;

            :

               
               Message.Text = ;
               ; 

         }

      }

       Sort_List(string commandArgument)
      {

         (commandArgument)
         {

             :

               
               Message.Text = ;
               ;

             :

               
               Message.Text = ;
               ;

            :

               
               Message.Text = ;
               ;

         }

      }

       Page_Load(Object sender, EventArgs e)
      {

         
         
         Button1.Command +=  CommandEventHandler(.CommandBtn_Click);
         Button2.Command +=  CommandEventHandler(.CommandBtn_Click);
         Button3.Command +=  CommandEventHandler(.CommandBtn_Click);
         Button4.Command +=  CommandEventHandler(.CommandBtn_Click);
         Button5.Command +=  CommandEventHandler(.CommandBtn_Click);

      }

   </script>

</head>

<body>

   <form id= runat=>

      <h3>Button CommandName Example</h3>

      Click one of the command buttons.

      <br /><br />

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           runat=/>

      &nbsp;

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           runat=/>

      <br /><br />

      <asp:Button id=
           Text=
           CommandName=
           runat=/>

      &nbsp;

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           runat=/>

      &nbsp;

      <asp:Button id=
           Text=
           CommandName=
           CommandArgument=
           runat=/>

      <br /><br />

      <asp:Label id= runat=/>

   </form>

</body>
</html>

Permissões

AspNetHostingPermission
Para operar em um ambiente hospedado.Exigem valor: LinkDemand; Permission value: Minimal.
AspNetHostingPermission
Para operar em um ambiente hospedado.Exigem valor: InheritanceDemand; Permission value: Minimal.

Hierarquia de herança

Segurança de Segmentos

Quaisquer membros públicos estático (compartilhados na Visual Basic) desse tipo são Thread seguro. Não há garantia de que qualquer membro de instância seja isento de segmentos.

Consulte também

Referência

CommandEventArgs Membros

System.Web.UI.WebControls Namespace

CommandEventHandler

Button.Command

ImageButton.Command

Outros recursos

Visão Geral dos Controles do Servidor Web de Botão

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