GridView.RowCommand Evento

Definição

Ocorre quando se clica em um botão em um controle GridView.Occurs when a button is clicked in a GridView control.

public:
 event System::Web::UI::WebControls::GridViewCommandEventHandler ^ RowCommand;
public event System.Web.UI.WebControls.GridViewCommandEventHandler RowCommand;
member this.RowCommand : System.Web.UI.WebControls.GridViewCommandEventHandler 
Public Custom Event RowCommand As GridViewCommandEventHandler 

Tipo de evento

GridViewCommandEventHandler

Exemplos

Um projeto de site do Visual Studio com código-fonte está disponível para acompanhar este tópico: Download.A Visual Studio Web site project with source code is available to accompany this topic: Download.

O exemplo a seguir demonstra como usar o RowCommand evento para adicionar o nome de um cliente de um GridView controle a um ListBox controle quando o botão Adicionar de uma linha é clicado.The following example demonstrates how to use the RowCommand event to add the name of a customer from a GridView control to a ListBox control when a row's Add button is clicked.


<%@ 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 ContactsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
  {
    // If multiple buttons are used in a GridView control, use the
    // CommandName property to determine which button was clicked.
    if(e.CommandName=="Add")
    {
      // Convert the row index stored in the CommandArgument
      // property to an Integer.
      int index = Convert.ToInt32(e.CommandArgument);

      // Retrieve the row that contains the button clicked 
      // by the user from the Rows collection.
      GridViewRow row = ContactsGridView.Rows[index];

      // Create a new ListItem object for the contact in the row.     
      ListItem item = new ListItem();
      item.Text = Server.HtmlDecode(row.Cells[2].Text) + " " +
        Server.HtmlDecode(row.Cells[3].Text);

      // If the contact is not already in the ListBox, add the ListItem 
      // object to the Items collection of the ListBox control. 
      if (!ContactsListBox.Items.Contains(item))
      {
        ContactsListBox.Items.Add(item);
      }
    }
  }    
</script>

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

      <h3>GridView RowCommand Example</h3>

      <table width="100%">
        <tr>
          <td style="width:50%">

            <asp:gridview id="ContactsGridView" 
              datasourceid="ContactsSource"
              allowpaging="true" 
              autogeneratecolumns="false"
              onrowcommand="ContactsGridView_RowCommand"
              runat="server">

              <columns>
                <asp:buttonfield buttontype="Link" 
                  commandname="Add" 
                  text="Add"/>
                <asp:boundfield datafield="ContactID" 
                  headertext="Contact ID"/>
                <asp:boundfield datafield="FirstName" 
                  headertext="First Name"/> 
                <asp:boundfield datafield="LastName" 
                  headertext="Last Name"/>
              </columns>

            </asp:gridview>

          </td>

          <td style="vertical-align:top; width:50%">

            Contacts: <br/>
            <asp:listbox id="ContactsListBox"
              runat="server" Height="200px" Width="200px"/>

          </td>
        </tr>
      </table>

      <!-- This example uses Microsoft SQL Server and connects    -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET  -->
      <!-- expression to retrieve the connection string value     -->
      <!-- from the Web.config file.                              -->
      <asp:sqldatasource id="ContactsSource"
        selectcommand="Select [ContactID], [FirstName], [LastName] From Person.Contact"
        connectionstring="<%$ ConnectionStrings:AdventureWorks_DataConnectionString%>" 
        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 ContactsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)

    ' If multiple buttons are used in a GridView control, use the
    ' CommandName property to determine which button was clicked.
    If e.CommandName = "Add" Then
    
      ' Convert the row index stored in the CommandArgument
      ' property to an Integer.
      Dim index As Integer = Convert.ToInt32(e.CommandArgument)
            
      ' Retrieve the row that contains the button clicked 
      ' by the user from the Rows collection.
      Dim row As GridViewRow = ContactsGridView.Rows(index)
            
      ' Create a new ListItem object for the contact in the row.     
      Dim item As New ListItem()
      item.Text = Server.HtmlDecode(row.Cells(2).Text) & " " & _
        Server.HtmlDecode(row.Cells(3).Text)
            
      ' If the contact is not already in the ListBox, add the ListItem 
      ' object to the Items collection of the ListBox control. 
      If Not ContactsListBox.Items.Contains(item) Then
      
        ContactsListBox.Items.Add(item)
        
      End If
      
    End If
    
  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>GridView RowCommand Example</title>
</head>
<body>
    <form id="form1" runat="server">

      <h3>GridView RowCommand Example</h3>

      <table width="100%">
        <tr>
          <td style="width:50%">

            <asp:gridview id="ContactsGridView" 
              datasourceid="ContactsSource"
              allowpaging="true" 
              autogeneratecolumns="false"
              onrowcommand="ContactsGridView_RowCommand"
              runat="server">

              <columns>
                <asp:buttonfield buttontype="Link" 
                  commandname="Add" 
                  text="Add"/>
                <asp:boundfield datafield="ContactID" 
                  headertext="Contact ID"/>
                <asp:boundfield datafield="FirstName" 
                  headertext="First Name"/> 
                <asp:boundfield datafield="LastName" 
                  headertext="Last Name"/>
              </columns>

            </asp:gridview>

          </td>

          <td style="vertical-align:top; width:50%">

            Contacts: <br/>
            <asp:listbox id="ContactsListBox"
              runat="server" Height="200px" Width="200px"/>

          </td>
        </tr>
      </table>

      <!-- This example uses Microsoft SQL Server and connects    -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET  -->
      <!-- expression to retrieve the connection string value     -->
      <!-- from the Web.config file.                              -->
      <asp:sqldatasource id="ContactsSource"
        selectcommand="Select [ContactID], [FirstName], [LastName] From Person.Contact"
        connectionstring="<%$ ConnectionStrings:AdventureWorks_DataConnectionString%>" 
        runat="server"/>

    </form>
  </body>
</html>

O exemplo a seguir demonstra como usar o RowCommand evento para atualizar o preço de um produto quando o botão de uma linha é clicado.The following example demonstrates how to use the RowCommand event to update the price of a product when a row's button is clicked. Este exemplo tem a funcionalidade de paginação habilitada para o GridView controle e define a CommandArgument Propriedade do Button controle para o índice de linha apropriado.This example has the paging functionality enabled for the GridView control and sets the CommandArgument property of the Button control to the appropriate row index.


<%@ 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 ProductsGridView_RowCommand(Object sender, GridViewCommandEventArgs e)
  {
    // If multiple buttons are used in a GridView control, use the
    // CommandName property to determine which button was clicked.
    if(e.CommandName=="Increase")
    {
      // Convert the row index stored in the CommandArgument
      // property to an Integer.
      int index = Convert.ToInt32(e.CommandArgument);

      // Retrieve the row that contains the button clicked 
      // by the user from the Rows collection.      
      GridViewRow row = ProductsGridView.Rows[index];

      // Calculate the new price.
      Label listPriceTextBox = (Label)row.FindControl("PriceLabel");
      listPriceTextBox.Text = (Convert.ToDouble(listPriceTextBox.Text) * 1.05).ToString();     

      // Update the row.
      ProductsGridView.UpdateRow(index, false);
    }
  }
</script>

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

      <h3>GridView RowCommand Example</h3>

      <asp:GridView id="ProductsGridView" 
        DataSourceID="ProductsDataSource"
        DataKeyNames="ProductID"
        AllowPaging="True" 
        OnRowCommand="ProductsGridView_RowCommand"
        AutoGenerateColumns="False"
        runat="server">
        <Columns>
          <asp:BoundField DataField="Name" HeaderText="Product Name" />
          <asp:BoundField DataField="ProductNumber" HeaderText="Product Number" />          
          <asp:TemplateField HeaderText="Price">
            <ItemTemplate>
              <asp:Label ID="PriceLabel" runat="server" 
                Text='<%# Bind("ListPrice") %>'>
              </asp:Label>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField>
            <ItemTemplate>                
              <asp:Button runat="server" ID="IncreaseButton"
                Text="Increase Price 5%"
                CommandName="Increase"
                CommandArgument="<%# ((GridViewRow) Container).RowIndex %>" />
            </ItemTemplate>
          </asp:TemplateField>
        </Columns>
      </asp:GridView>

      <!-- This example uses Microsoft SQL Server and connects    -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET  -->
      <!-- expression to retrieve the connection string value     -->
      <!-- from the Web.config file.                              -->
      <asp:SqlDataSource id="ProductsDataSource"
        SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [ListPrice] 
          FROM Production.Product 
          WHERE ListPrice &lt;&gt; 0"
        UpdateCommand="UPDATE Production.Product SET [ListPrice] = @ListPrice 
          WHERE [ProductID] = @ProductID"
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        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 ProductsGridView_RowCommand(ByVal sender As Object, ByVal e As GridViewCommandEventArgs)

    ' If multiple buttons are used in a GridView control, use the
    ' CommandName property to determine which button was clicked.
    If e.CommandName = "Increase" Then
    
      ' Convert the row index stored in the CommandArgument
      ' property to an Integer.
      Dim index = Convert.ToInt32(e.CommandArgument)
            
      ' Retrieve the row that contains the button clicked 
      ' by the user from the Rows collection.
      Dim row = ProductsGridView.Rows(index)
      
      ' Calculate the new price.
      Dim listPriceTextBox = CType(row.FindControl("PriceLabel"), Label)
      listPriceTextBox.Text = (Convert.ToDouble(listPriceTextBox.Text) * 1.05).ToString()

      ' Update the row.
      ProductsGridView.UpdateRow(index, False)
      
    End If
    
  End Sub
</script>

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

      <h3>GridView RowCommand Example</h3>

      <asp:GridView id="ProductsGridView" 
        DataSourceID="ProductsDataSource"
        DataKeyNames="ProductID"
        AllowPaging="True" 
        OnRowCommand="ProductsGridView_RowCommand"
        AutoGenerateColumns="False"
        runat="server">
        <Columns>
          <asp:BoundField DataField="Name" HeaderText="Product Name" />
          <asp:BoundField DataField="ProductNumber" HeaderText="Product Number" />          
          <asp:TemplateField HeaderText="Price">
            <ItemTemplate>
              <asp:Label ID="PriceLabel" runat="server" 
                Text='<%# Bind("ListPrice") %>'>
              </asp:Label>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:TemplateField>
            <ItemTemplate>                
              <asp:Button runat="server" ID="IncreaseButton"
                Text="Increase Price 5%"
                CommandName="Increase"
                CommandArgument="<%# CType(Container, GridViewRow).RowIndex %>" />
            </ItemTemplate>
          </asp:TemplateField>
        </Columns>
      </asp:GridView>

      <!-- This example uses Microsoft SQL Server and connects    -->
      <!-- to the AdventureWorks sample database. Use an ASP.NET  -->
      <!-- expression to retrieve the connection string value     -->
      <!-- from the Web.config file.                              -->
      <asp:SqlDataSource id="ProductsDataSource"
        SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [ListPrice] 
          FROM Production.Product 
          WHERE ListPrice &lt;&gt; 0"
        UpdateCommand="UPDATE Production.Product SET [ListPrice] = @ListPrice 
          WHERE [ProductID] = @ProductID"
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        runat="server" />

    </form>
  </body>
</html>

Comentários

O RowCommand evento é gerado quando um botão é clicado no GridView controle.The RowCommand event is raised when a button is clicked in the GridView control. Isso permite que você forneça um método de manipulação de eventos que execute uma rotina personalizada sempre que esse evento ocorrer.This enables you to provide an event-handling method that performs a custom routine whenever this event occurs.

Os botões dentro de um GridView controle também podem invocar algumas das funcionalidades internas do controle.Buttons within a GridView control can also invoke some of the built-in functionality of the control. Para executar uma dessas operações, defina a CommandName propriedade de um botão como um dos valores na tabela a seguir.To perform one of these operations, set the CommandName property of a button to one of the values in the following table.

CommandName valorCommandName value DescriçãoDescription
Cancela"Cancel" Cancela uma operação de edição e retorna o GridView controle para o modo somente leitura.Cancels an edit operation and returns the GridView control to read-only mode. Aciona o evento RowCancelingEdit.Raises the RowCancelingEdit event.
Apagar"Delete" Exclui o registro atual.Deletes the current record. Gera os RowDeleting RowDeleted eventos e.Raises the RowDeleting and RowDeleted events.
Editar"Edit" Coloca o registro atual no modo de edição.Puts the current record in edit mode. Aciona o evento RowEditing.Raises the RowEditing event.
Web"Page" Executa uma operação de paginação.Performs a paging operation. Define a CommandArgument Propriedade do botão como "primeiro", "último", "próximo", "anterior" ou um número de página para especificar o tipo de operação de paginação a ser executada.Sets the CommandArgument property of the button to "First", "Last", "Next", "Prev", or a page number to specify the type of paging operation to perform. Gera os PageIndexChanging PageIndexChanged eventos e.Raises the PageIndexChanging and PageIndexChanged events.
"Selecionar""Select" Seleciona o registro atual.Selects the current record. Gera os SelectedIndexChanging SelectedIndexChanged eventos e.Raises the SelectedIndexChanging and SelectedIndexChanged events.
Organizar"Sort" Classifica o controle GridView .Sorts the GridView control. Gera os Sorting Sorted eventos e.Raises the Sorting and Sorted events.
Cumulativo"Update" Atualiza o registro atual na fonte de dados.Updates the current record in the data source. Gera os RowUpdating RowUpdated eventos e.Raises the RowUpdating and RowUpdated events.

Embora o RowCommand evento seja gerado quando um botão listado na tabela anterior é clicado, é recomendável que você use os eventos listados na tabela para a operação.Although the RowCommand event is raised when a button listed in the previous table is clicked, it is recommended that you use the events listed in the table for the operation.

Um GridViewCommandEventArgs objeto é passado para o método de manipulação de eventos, que permite que você determine o nome do comando e o argumento de comando do botão clicado.A GridViewCommandEventArgs object is passed to the event-handling method, which enables you to determine the command name and command argument of the button clicked.

Observação

Para determinar o índice da linha que disparou o evento, use a CommandArgument Propriedade do argumento de evento que é passada para o evento.To determine the index of the row that raised the event, use the CommandArgument property of the event argument that is passed to the event. A ButtonField classe popula automaticamente a CommandArgument propriedade com o valor de índice apropriado.The ButtonField class automatically populates the CommandArgument property with the appropriate index value. Para outros botões de comando, você deve definir manualmente a CommandArgument Propriedade do botão de comando.For other command buttons, you must manually set the CommandArgument property of the command button. Por exemplo, você pode definir CommandArgument como <%# Container.DataItemIndex %> quando o GridView controle não tem nenhuma paginação habilitada.For example, you can set the CommandArgument to <%# Container.DataItemIndex %> when the GridView control has no paging enabled.

Para obter mais informações sobre como lidar com eventos, consulte manipulando e gerando eventos.For more information about how to handle events, see Handling and Raising Events.

Aplica-se a

Confira também