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GridViewRowCollection.GetEnumerator Método

Definição

Retorna um enumerador que contém todos os objetos GridViewRow no GridViewRowCollection.

public:
 virtual System::Collections::IEnumerator ^ GetEnumerator();
public System.Collections.IEnumerator GetEnumerator ();
abstract member GetEnumerator : unit -> System.Collections.IEnumerator
override this.GetEnumerator : unit -> System.Collections.IEnumerator
Public Function GetEnumerator () As IEnumerator

Retornos

IEnumerator

Um objeto implementado por IEnumerator que contém todos os objetos GridViewRow na GridViewRowCollection.

Implementações

Exemplos

O exemplo a seguir demonstra como usar o GetEnumerator método para recuperar um enumerador que contém os valores da coleção. O enumerador é iterado e os valores da primeira célula são exibidos na página.


<%@ 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 AuthorsGridView_RowCreated(Object sender, GridViewRowEventArgs e)
  {
    if (e.Row.RowType == DataControlRowType.Footer)
    {
      Message.Text = "The authors are:<br />";
      
      // Get the enumerator that contains the data rows in the 
      // GridView control.
      IEnumerator rowEnumerator = AuthorsGridView.Rows.GetEnumerator();

      // Iterate though the enumerator and display the value in the
      // first cell of the row.
      while(rowEnumerator.MoveNext())
      {
        GridViewRow row = (GridViewRow)rowEnumerator.Current;
        Message.Text += row.Cells[0].Text + "<br />";
      }
    }
  }

</script>

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

      <table>
        <tr>
          <td>
            <asp:gridview id="AuthorsGridView" 
              datasourceid="AuthorsSqlDataSource" 
              autogeneratecolumns="false"
              onrowcreated="AuthorsGridView_RowCreated"  
              runat="server"> 
                     
              <columns>
                <asp:boundfield datafield="au_lname"
                  headertext="Last Name"/>
                <asp:boundfield datafield="au_fname"
                  headertext="First Name"/>
              </columns>
                                    
            </asp:gridview>
          </td>
          <td>
            <asp:label id="Message" 
              forecolor="Red"
              runat="server"/>
          </td>
        </tr>
      </table>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_lname], [au_fname] FROM [authors] WHERE [state]='CA'"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
          
    </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 AuthorsGridView_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)

    If e.Row.RowType = DataControlRowType.Footer Then
    
      Message.Text = "The authors are:<br />"
      
      ' Get the enumerator that contains the data rows in the 
      ' GridView control.
      Dim rowEnumerator As IEnumerator = AuthorsGridView.Rows.GetEnumerator()

      ' Iterate though the enumerator and display the value in the
      ' first cell of the row.
      While rowEnumerator.MoveNext()

        Dim row As GridViewRow = CType(rowEnumerator.Current, GridViewRow)
        Message.Text &= row.Cells(0).Text & "<br />"
      
      End While
      
    End If
  
  End Sub

</script>

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

      <table>
        <tr>
          <td>
            <asp:gridview id="AuthorsGridView" 
              datasourceid="AuthorsSqlDataSource" 
              autogeneratecolumns="false"
              onrowcreated="AuthorsGridView_RowCreated"  
              runat="server"> 
                     
              <columns>
                <asp:boundfield datafield="au_lname"
                  headertext="Last Name"/>
                <asp:boundfield datafield="au_fname"
                  headertext="First Name"/>
              </columns>
                                    
            </asp:gridview>
          </td>
          <td>
            <asp:label id="Message" 
              forecolor="Red"
              runat="server"/>
          </td>
        </tr>
      </table>
            
      <!-- This example uses Microsoft SQL Server and connects -->
      <!-- to the Pubs sample database.                        -->
      <asp:sqldatasource id="AuthorsSqlDataSource"  
        selectcommand="SELECT [au_lname], [au_fname] FROM [authors] WHERE [state]='CA'"
        connectionstring="server=localhost;database=pubs;integrated security=SSPI"
        runat="server">
      </asp:sqldatasource>
          
    </form>
  </body>
</html>

Comentários

Use esse método para obter um enumerador que pode ser iterado linearmente para acessar cada item no GridViewRowCollection. Para acessar o item na posição atual no enumerador, use a IEnumerator.Current propriedade. Use o IEnumerator.MoveNext método para mover para o próximo item na coleção. Para mover o enumerador para sua posição inicial, use o IEnumerator.Reset método.

Observação

Quando você obtém inicialmente o enumerador ou usa o IEnumerator.Reset método para mover o enumerador para o primeiro item da coleção, você deve chamar o IEnumerator.MoveNext método. Caso contrário, o item representado pela IEnumerator.Current propriedade é indefinido.

Aplica-se a

Confira também