DetailsViewCommandEventArgs Classe

Definição

Espaço de Nomes:: System.Web.UI.WebControls

Assemblagem:: System.Web.dll

Importante

Algumas informações dizem respeito a um produto pré-lançado que pode ser substancialmente modificado antes de ser lançado. A Microsoft não faz garantias, de forma expressa ou implícita, em relação à informação aqui apresentada.

Fornece dados para o ItemCommand evento.

public ref class DetailsViewCommandEventArgs : System::Web::UI::WebControls::CommandEventArgs

public class DetailsViewCommandEventArgs : System.Web.UI.WebControls.CommandEventArgs

type DetailsViewCommandEventArgs = class
    inherit CommandEventArgs

Public Class DetailsViewCommandEventArgs
Inherits CommandEventArgs

Herança: Object

EventArgs

CommandEventArgs
DetailsViewCommandEventArgs

Exemplos

O exemplo de código seguinte demonstra como usar o DetailsViewCommandEventArgs objeto passado ao gestor de eventos para que o ItemCommand evento determine o nome do comando do botão clicado pelo utilizador. Este exemplo utiliza o modelo de codificação de ficheiro único.


<%@ 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 ItemDetailsView_ItemCommand(Object sender, 
      DetailsViewCommandEventArgs e)
  {

    // Use the CommandName property to determine which button
    // was clicked. 
    if (e.CommandName == "Add")
    {

      // Add the customer to the customer list. 

      // Get the row that contains the company name. In this
      // example, the company name is in the second row (index 1)  
      // of the DetailsView control.
      DetailsViewRow row = ItemDetailsView.Rows[1];

      // Get the company's name from the appropriate cell.
      // In this example, the company name is in the second cell  
      // (index 1) of the row.
      String name = row.Cells[1].Text;

      // Create a ListItem object with the company name.
      ListItem item = new ListItem(name);

      // Add the ListItem object to the ListBox control, if the 
      // item does not already exist.
      if (!CustomerListBox.Items.Contains(item))
      {
        CustomerListBox.Items.Add(item);
      }

    }

  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>DetailsViewCommandEventArgs Example</h3>
  
      <asp:detailsview id="ItemDetailsView"
        datasourceid="DetailsViewSource"
        allowpaging="true"
        autogeneraterows="false" 
        onitemcommand="ItemDetailsView_ItemCommand"  
        runat="server">
        <fields>
          <asp:boundfield datafield="CustomerID"
            headertext="Customer ID"/>
          <asp:boundfield datafield="CompanyName"
            headertext="Company Name"/>
          <asp:boundfield datafield="Address"
            headertext="Address"/>
          <asp:boundfield datafield="City"
            headertext="City"/>
          <asp:boundfield datafield="PostalCode"
            headertext="ZIP Code"/>
          <asp:boundfield datafield="Country"
            headertext="Country"/>
          <asp:buttonfield buttontype="Link"
            causesvalidation="false"
            text="Add to List"
            commandname="Add"/>
        </fields>
      </asp:detailsview>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- 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="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>


<%@ page language="VB" autoeventwireup="false" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub ItemDetailsView_ItemCommand(ByVal sender As Object, _
    ByVal e As DetailsViewCommandEventArgs) _
    Handles ItemDetailsView.ItemCommand

    ' Use the CommandName property to determine which button
    ' was clicked. 
    If e.CommandName = "Add" Then

      ' Add the customer to the customer list. 

      ' Get the row that contains the company name. In this
      ' example, the company name is in the second row (index 1)  
      ' of the DetailsView control.
      Dim row As DetailsViewRow = ItemDetailsView.Rows(1)

      ' Get the company's name from the appropriate cell.
      ' In this example, the company name is in the second cell  
      ' (index 1) of the row.
      Dim name As String = row.Cells(1).Text

      ' Create a ListItem object with the company name.
      Dim item As New ListItem(name)

      ' Add the ListItem object to the ListBox control, if the 
      ' item does not already exist.
      If Not CustomerListBox.Items.Contains(item) Then

        CustomerListBox.Items.Add(item)
        
      End If

    End If

  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>DetailsViewCommandEventArgs Example</h3>
  
      <asp:detailsview id="ItemDetailsView"
        datasourceid="DetailsViewSource"
        allowpaging="true"
        autogeneraterows="false"  
        runat="server">
        <fields>
          <asp:boundfield datafield="CustomerID"
            headertext="Customer ID"/>
          <asp:boundfield datafield="CompanyName"
            headertext="Company Name"/>
          <asp:boundfield datafield="Address"
            headertext="Address"/>
          <asp:boundfield datafield="City"
            headertext="City"/>
          <asp:boundfield datafield="PostalCode"
            headertext="ZIP Code"/>
          <asp:boundfield datafield="Country"
            headertext="Country"/>
          <asp:buttonfield buttontype="Link"
            causesvalidation="false"
            text="Add to List"
            commandname="Add"/>
        </fields>
      </asp:detailsview>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- 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="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>

O exemplo de código seguinte mostra uma versão do modelo de codificação por trás do exemplo anterior. Para que este exemplo funcione, deve copiar o código abaixo para o ficheiro code-behind associado.

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventArgs Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    
      <h3>DetailsViewCommandEventArgs Example</h3>
  
      <asp:detailsview id="ItemDetailsView"
        datasourceid="DetailsViewSource"
        allowpaging="true"
        autogeneraterows="false" 
        onitemcommand="ItemDetailsView_ItemCommand"  
        runat="server">
        <fields>
          <asp:boundfield datafield="CustomerID"
            headertext="Customer ID"/>
          <asp:boundfield datafield="CompanyName"
            headertext="Company Name"/>
          <asp:boundfield datafield="Address"
            headertext="Address"/>
          <asp:boundfield datafield="City"
            headertext="City"/>
          <asp:boundfield datafield="PostalCode"
            headertext="ZIP Code"/>
          <asp:boundfield datafield="Country"
            headertext="Country"/>
          <asp:buttonfield buttontype="Link"
            causesvalidation="false"
            text="Add to List"
            commandname="Add"/>
        </fields>
      </asp:detailsview>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- 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="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="DefaultVB.aspx.vb" Inherits="DefaultVB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewCommandEventArgs Example</title>
</head>
<body>
    <form id="Form1" runat="server">
    
      <h3>DetailsViewCommandEventArgs Example</h3>
  
      <asp:detailsview id="ItemDetailsView"
        datasourceid="DetailsViewSource"
        allowpaging="true"
        autogeneraterows="false" 
        onitemcommand="ItemDetailsView_ItemCommand"  
        runat="server">
        <fields>
          <asp:boundfield datafield="CustomerID"
            headertext="Customer ID"/>
          <asp:boundfield datafield="CompanyName"
            headertext="Company Name"/>
          <asp:boundfield datafield="Address"
            headertext="Address"/>
          <asp:boundfield datafield="City"
            headertext="City"/>
          <asp:boundfield datafield="PostalCode"
            headertext="ZIP Code"/>
          <asp:boundfield datafield="Country"
            headertext="Country"/>
          <asp:buttonfield buttontype="Link"
            causesvalidation="false"
            text="Add to List"
            commandname="Add"/>
        </fields>
      </asp:detailsview>
      
      <br/><br/>
      
      Selected Customers:<br/>
      <asp:listbox id="CustomerListBox"
        runat="server"/>
      
      <!-- 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="DetailsViewSource"
        selectcommand="Select [CustomerID], [CompanyName], [Address], 
          [City], [PostalCode], [Country] From [Customers]"
        connectionstring=
          "<%$ ConnectionStrings:NorthWindConnectionString%>" 
        runat="server"/>  
  
    </form>
  </body>
</html>

O exemplo de código seguinte mostra o ficheiro code-behind do exemplo anterior.

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
    public void ItemDetailsView_ItemCommand(Object sender, DetailsViewCommandEventArgs e)
    {

        // Use the CommandName property to determine which button
        // was clicked. 
        if (e.CommandName == "Add")
        {

            // Add the customer to the customer list. 

            // Get the row that contains the company name. In this
            // example, the company name is in the second row (index 1)  
            // of the DetailsView control.
            DetailsViewRow row = ItemDetailsView.Rows[1];

            // Get the company's name from the appropriate cell.
            // In this example, the company name is in the second cell  
            // (index 1) of the row.
            String name = row.Cells[1].Text;

            // Create a ListItem object with the company name.
            ListItem item = new ListItem(name);

            // Add the ListItem object to the ListBox control, if the 
            // item does not already exist.
            if (!CustomerListBox.Items.Contains(item))
            {
                CustomerListBox.Items.Add(item);
            }
        }
    }
}

Partial Class DefaultVB
    Inherits System.Web.UI.Page

    Public Sub ItemDetailsView_ItemCommand(ByVal sender As Object, ByVal e As DetailsViewCommandEventArgs)
        ' Use the CommandName property to determine which button
        ' was clicked. 
        If e.CommandName = "Add" Then
        
            ' Add the customer to the customer list. 

            ' Get the row that contains the company name. In this
            ' example, the company name is in the second row (index 1)  
            ' of the DetailsView control.
            Dim row As DetailsViewRow = ItemDetailsView.Rows(1)

            ' Get the company's name from the appropriate cell.
            ' In this example, the company name is in the second cell  
            ' (index 1) of the row.
            Dim name As String = row.Cells(1).Text

            ' Create a ListItem object with the company name.
            Dim item As ListItem = New ListItem(name)

            ' Add the ListItem object to the ListBox control, if the 
            ' item does not already exist.
            If Not CustomerListBox.Items.Contains(item) Then
                CustomerListBox.Items.Add(item)
            End If
        End If
    End Sub

End Class

Observações

O DetailsView controlo aumenta o ItemCommand evento quando um botão dentro de um ButtonFieldcampo de , CommandField, ou TemplateField linha é clicado. Isto permite-lhe fornecer um gestor de eventos que executa uma rotina personalizada sempre que este evento ocorre.

Note

O DetailsView controlo também gera outros eventos especializados quando certos botões são clicados (botões com a CommandName propriedade definida como "Eliminar", "Inserir", "Página" ou "Atualizar"). Ao usar um destes botões, deve considerar usar um dos eventos especializados fornecidos pelo controlo (como ItemDeleted ou ItemDeleting).

Um DetailsViewCommandEventArgs objeto é passado para o gestor de eventos. Se o botão que levantou o evento tiver um nome de comando ou valor de argumento de comando, pode usar o DetailsViewCommandEventArgs objeto para determinar esses valores. Para determinar o nome do comando e o argumento do comando do botão clicado, use as CommandName propriedades e CommandArgument , respetivamente. Também pode aceder ao DetailsView controlo que gerou o evento usando a CommandSource propriedade.

Para uma lista de valores iniciais de propriedades para uma instância da DetailsViewCommandEventArgs classe, veja o DetailsViewCommandEventArgs construtor.

Construtores

Name	Description
DetailsViewCommandEventArgs(Object, CommandEventArgs)	Inicializa uma nova instância da DetailsViewCommandEventArgs classe.

Propriedades

Name	Description
CommandArgument	Percebe o argumento a favor do comando. (Herdado de CommandEventArgs)
CommandName	Obtém o nome do comando. (Herdado de CommandEventArgs)
CommandSource	Obtém a origem do comando.
Handled	Recebe ou define um valor que indica se o controlo tratou o evento.

Métodos

Name	Description
Equals(Object)	Determina se o objeto especificado é igual ao objeto atual. (Herdado de Object)
GetHashCode()	Serve como função de hash predefinida. (Herdado de Object)
GetType()	Obtém o Type da instância atual. (Herdado de Object)
MemberwiseClone()	Cria uma cópia superficial do atual Object. (Herdado de Object)
ToString()	Devolve uma cadeia que representa o objeto atual. (Herdado de Object)

Aplica-se a

Ver também

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