SqlDataSourceStatusEventHandler Delegado

Definición

Representa el método que controlará los eventos Selected, Updated, Inserted y Deleted del control SqlDataSource.Represents the method that will handle the Selected, Updated, Inserted, and Deleted events of the SqlDataSource control.

public delegate void SqlDataSourceStatusEventHandler(System::Object ^ sender, SqlDataSourceStatusEventArgs ^ e);
public delegate void SqlDataSourceStatusEventHandler(object sender, SqlDataSourceStatusEventArgs e);
type SqlDataSourceStatusEventHandler = delegate of obj * SqlDataSourceStatusEventArgs -> unit
Public Delegate Sub SqlDataSourceStatusEventHandler(sender As Object, e As SqlDataSourceStatusEventArgs)

Parámetros

sender
Object

Origen del evento, el control SqlDataSource.The source of the event, the SqlDataSource control.

e
SqlDataSourceStatusEventArgs

Objeto SqlDataSourceStatusEventArgs que contiene los datos del evento.A SqlDataSourceStatusEventArgs that contains the event data.

Ejemplos

En el ejemplo de código siguiente se muestra cómo controlar el Updated evento y examinar los valores contenidos en el SqlDataSourceStatusEventArgs objeto.The following code example demonstrates how to handle the Updated event and examine the values contained in the SqlDataSourceStatusEventArgs object. El OnUpdated método llama a OnDSUpdatedHandler para realizar el procesamiento posterior adicional después de que Update un control realice una acción SqlDataSource .The OnDSUpdatedHandler is called by the OnUpdated method to perform additional post-processing after an Update action is performed by a SqlDataSource control.

<%@Page  Language="C#" %>
<%@Import Namespace="System.Web.Mail" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
 private void OnDSUpdatedHandler(Object source, SqlDataSourceStatusEventArgs e) {
    if (e.AffectedRows > 0) {
        // Perform any additional processing, 
        // such as setting a status label after the operation.
        Label1.Text = Request.LogonUserIdentity.Name +
            " changed user information successfully!";    
    }
    else {
        Label1.Text = "No data updated!";
    }
 }
</script>

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

      <asp:SqlDataSource
          id="SqlDataSource1"
          runat="server"
          DataSourceMode="DataSet"
          ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
          SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"
          UpdateCommand="Update Employees SET FirstName=@FirstName,LastName=@LastName,Title=@Title WHERE EmployeeID=@EmployeeID"
          OnUpdated="OnDSUpdatedHandler">
      </asp:SqlDataSource>

      <asp:GridView
          id="GridView1"
          runat="server"
          AutoGenerateColumns="False"
          DataKeyNames="EmployeeID"
          AutoGenerateEditButton="True"
          DataSourceID="SqlDataSource1">
          <columns>
              <asp:BoundField HeaderText="First Name" DataField="FirstName" />
              <asp:BoundField HeaderText="Last Name" DataField="LastName" />
              <asp:BoundField HeaderText="Title" DataField="Title" />
          </columns>
      </asp:GridView>

      <asp:Label
          id="Label1"
          runat="server">
      </asp:Label>

    </form>
  </body>
</html>
<%@Page  Language="VB" %>
<%@Import Namespace="System.Web.Mail" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

 Sub OnDSUpdatedHandler(ByVal source As Object, ByVal e As SqlDataSourceStatusEventArgs)
    If e.AffectedRows > 0 Then
        ' Perform any additional processing, 
        ' such as setting a status label after the operation.        
        Label1.Text = Request.LogonUserIdentity.Name & _
            " changed user information successfully!"
    Else 
        Label1.Text = "No data updated!"
    End If
 End Sub 'OnDSUpdatedHandler
</script>

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

      <asp:SqlDataSource
          id="SqlDataSource1"
          runat="server"
          DataSourceMode="DataSet"
          ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
          SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees"
          UpdateCommand="Update Employees SET FirstName=@FirstName,LastName=@LastName,Title=@Title WHERE EmployeeID=@EmployeeID"
          OnUpdated="OnDSUpdatedHandler">
      </asp:SqlDataSource>

      <asp:GridView
          id="GridView1"
          runat="server"
          AutoGenerateColumns="False"
          DataKeyNames="EmployeeID"
          AutoGenerateEditButton="True"
          DataSourceID="SqlDataSource1">
          <columns>
              <asp:BoundField HeaderText="First Name" DataField="FirstName" />
              <asp:BoundField HeaderText="Last Name" DataField="LastName" />
              <asp:BoundField HeaderText="Title" DataField="Title" />
          </columns>
      </asp:GridView>

      <asp:Label
          id="Label1"
          runat="server">
      </asp:Label>

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

Comentarios

Cuando se crea un delegado SqlDataSourceStatusEventHandler, se identifica el método que controlará el evento.When you create a SqlDataSourceStatusEventHandler delegate, you identify the method that will handle the event. Para asociar el evento al controlador, se debe agregar una instancia del delegado al evento.To associate the event with your event handler, add an instance of the delegate to the event. Siempre que se produce el evento, se llama a su controlador, a menos que se quite el delegado.The event handler is called whenever the event occurs, unless you remove the delegate. Para obtener más información acerca de cómo controlar eventos, vea controlar y provocar eventos.For more information about how to handle events, see Handling and Raising Events.

Métodos de extensión

GetMethodInfo(Delegate)

Obtiene un objeto que representa el método representado por el delegado especificado.Gets an object that represents the method represented by the specified delegate.

Se aplica a

Consulte también