SqlDataSourceView.OnInserting(SqlDataSourceCommandEventArgs) Método

Definición

Provoca el evento Inserting antes de que el control SqlDataSource trate de realizar una operación de inserción.Raises the Inserting event before the SqlDataSource control attempts an insert operation.

protected:
 virtual void OnInserting(System::Web::UI::WebControls::SqlDataSourceCommandEventArgs ^ e);
protected virtual void OnInserting (System.Web.UI.WebControls.SqlDataSourceCommandEventArgs e);
abstract member OnInserting : System.Web.UI.WebControls.SqlDataSourceCommandEventArgs -> unit
override this.OnInserting : System.Web.UI.WebControls.SqlDataSourceCommandEventArgs -> unit
Protected Overridable Sub OnInserting (e As SqlDataSourceCommandEventArgs)

Parámetros

e
SqlDataSourceCommandEventArgs

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

Ejemplos

En el ejemplo de código siguiente se muestra cómo recuperar datos de Microsoft SQL Server, cómo mostrarlos en un GridView control y cómo utilizar un DetailsView control para ver los detalles de una fila seleccionada en GridView y como un formulario para insertar nuevos registros.The following code example demonstrates how to retrieve data from Microsoft SQL Server, display it in a GridView control, and use a DetailsView control to see details of a selected row in the GridView and as a form to insert new records.

Inicialmente, los datos se muestran en el GridView control y la fila seleccionada de GridView también se muestra en el DetailsView control.Initially, the data is displayed in the GridView control and the selected row of the GridView is also displayed in the DetailsView control. Los GridView DetailsView controles y utilizan controles de origen de datos diferentes; el que está asociado a DetailsView tiene las FilterExpression FilterParameters propiedades y, que garantizan que se muestre la fila seleccionada de GridView .The GridView and DetailsView controls use different data source controls; the one that is associated with the DetailsView has the FilterExpression and FilterParameters properties, which ensure that the selected row of the GridView is displayed.

Si hace clic en el botón Insertar generado automáticamente del DetailsView control, DetailsView muestra una interfaz de usuario diferente, que se usa para insertar un nuevo registro.If you click the automatically generated Insert button of the DetailsView control, the DetailsView shows a different user interface, which is used to insert a new record. En el ejemplo se utiliza un procedimiento almacenado para insertar registros y se devuelve la clave principal de la fila insertada.The example uses a stored procedure to insert records and returns the primary key of the inserted row. Si inserta un registro, DetailsView rellena automáticamente la InsertParameters colección con los valores de las columnas enlazadas y llama al Insert método.If you insert a record, the DetailsView automatically populates the InsertParameters collection with values from the bound columns and calls the Insert method. DetailsViewPuede deducir los parámetros correctos de cualquier BoundField objeto y un parámetro para el TemplateField objeto cuando se utiliza la sintaxis de enlace de datos bidireccional ASP.net.The DetailsView can infer the correct parameters from any BoundField object and a parameter for the TemplateField object when the ASP.NET two-way data-binding syntax is used. En este ejemplo, se agrega un parámetro adicional en el OnInserting controlador de eventos para controlar la clave principal devuelta por el procedimiento almacenado.In this example, an additional parameter is added in the OnInserting event handler to handle the primary key that is returned by the stored procedure.

Por último, después de que el control Inserte los datos DetailsView en la base OnInserted de datos, se llama al controlador de eventos para controlar el Inserted evento, se muestra el valor de la clave principal de la fila insertada y se DataBind GridView llama explícitamente al método del control para actualizar los datos.Finally, after data is inserted by the DetailsView control into the database, the OnInserted event handler is called to handle the Inserted event, the value of the primary key of the inserted row is displayed, and the DataBind method of the GridView control is called explicitly to refresh the data.

<%@Page  Language="C#" %>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.Common" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!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 On_Inserting(Object sender, SqlDataSourceCommandEventArgs e) {

    SqlParameter insertedKey = new SqlParameter("@PK_New", SqlDbType.Int);
    insertedKey.Direction    = ParameterDirection.Output;        
    e.Command.Parameters.Add(insertedKey);
 }

 private void On_Inserted(Object sender, SqlDataSourceStatusEventArgs e) {
    DbCommand command = e.Command;    
    
    // The label displays the primary key of the recently inserted row.
    Label1.Text = command.Parameters["@PK_New"].Value.ToString();
    
    // Force a refresh after the data is inserted.
    GridView1.DataBind();
 }
</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:GridView
        id="GridView1"
        runat="server"
        AutoGenerateColumns="False"
        DataKeyNames="EmployeeID"        
        DataSourceID="SqlDataSource1">
        <columns>          
          <asp:BoundField HeaderText="First Name" DataField="FirstName" />
          <asp:BoundField HeaderText="Last Name" DataField="LastName" />
          <asp:BoundField HeaderText="Title" DataField="Title" />
          <asp:ButtonField ButtonType="Link" CommandName="Select" Text="Details..." />
        </columns>
      </asp:GridView>

      <asp:SqlDataSource
        id="SqlDataSource1"
        runat="server"
        ConnectionString="<%$ ConnectionStrings:MyNorthwind %>"
        SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees">
      </asp:SqlDataSource>

      <hr />

      <asp:DetailsView
        id="DetailsView1"
        runat="server"
        DataSourceID="SqlDataSource2"
        AutoGenerateRows="False"
        AutoGenerateInsertButton="True">
        <fields>
          <asp:BoundField HeaderText="First Name" DataField="FirstName" ReadOnly="False"/>
          <asp:BoundField HeaderText="Last Name" DataField="LastName" ReadOnly="False"/>
          <asp:TemplateField HeaderText="Title">
            <ItemTemplate>
              <asp:DropDownList
                id="TitleDropDownList"
                runat="server"
                selectedvalue="<%# Bind('Title') %>" >
                <asp:ListItem Selected="True">Sales Representative</asp:ListItem>
                <asp:ListItem>Sales Manager</asp:ListItem>
                <asp:ListItem>Vice President, Sales</asp:ListItem>
              </asp:DropDownList>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:BoundField HeaderText="Notes" DataField="Notes" ReadOnly="False"/>
        </fields>
      </asp:DetailsView>


      <asp:SqlDataSource
        id="SqlDataSource2"
        runat="server"
        ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
        SelectCommand="SELECT * FROM Employees"
        InsertCommandType = "StoredProcedure"
        InsertCommand="sp_insertemployee"        
        OnInserting="On_Inserting"
        OnInserted ="On_Inserted"
        FilterExpression="EmployeeID={0}">
        <FilterParameters>
          <asp:ControlParameter Name="EmployeeID" ControlId="GridView1" PropertyName="SelectedValue" />
        </FilterParameters>
      </asp:SqlDataSource>

<!-- 
     -- An example sp_insertemployee stored procedure that returns
     -- the primary key of the row that was inserted in an OUT parameter.
     CREATE PROCEDURE sp_insertemployee 
        @FirstName nvarchar(10), 
        @LastName nvarchar(20) , 
        @Title nvarchar(30), 
        @Notes nvarchar(200), 
        @PK_New int OUTPUT
      AS
        INSERT INTO Employees(FirstName,LastName,Title,Notes)VALUES (@FirstName,@LastName,@Title,@Notes)
        SELECT @PK_New = @@IDENTITY
        RETURN (1)    
      GO
-->      

      <asp:Label 
        id="Label1"
        runat="server" />
      
    </form>
  </body>
</html>
<%@Page  Language="VB" %>
<%@Import Namespace="System.Data" %>
<%@Import Namespace="System.Data.Common" %>
<%@Import Namespace="System.Data.SqlClient" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

 Sub On_Inserting(ByVal sender As Object, ByVal e As SqlDataSourceCommandEventArgs)

    Dim insertedKey As SqlParameter  
    insertedKey = New SqlParameter("@PK_New", SqlDbType.Int)
    insertedKey.Direction    = ParameterDirection.Output     
    
    e.Command.Parameters.Add(insertedKey)

 End Sub 'On_Inserting

 Sub On_Inserted(ByVal sender As Object, ByVal e As SqlDataSourceStatusEventArgs)
    Dim command As DbCommand 
    command = e.Command
    
    ' The label displays the primary key of the recently inserted row.
    Label1.Text = command.Parameters("@PK_New").Value.ToString()    
    
    ' Explicitly call DataBind to refresh the data
    ' and show the newly inserted row.
    GridView1.DataBind()
 End Sub 'On_Inserted

</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:GridView
        id="GridView1"
        runat="server"
        AutoGenerateColumns="False"
        DataKeyNames="EmployeeID"        
        DataSourceID="SqlDataSource1">
        <columns>          
          <asp:BoundField HeaderText="First Name" DataField="FirstName" />
          <asp:BoundField HeaderText="Last Name" DataField="LastName" />
          <asp:BoundField HeaderText="Title" DataField="Title" />
          <asp:ButtonField ButtonType="Link" CommandName="Select" Text="Details..." />
        </columns>
      </asp:GridView>

      <asp:SqlDataSource
        id="SqlDataSource1"
        runat="server"
        ConnectionString="<%$ ConnectionStrings:MyNorthwind %>"
        SelectCommand="SELECT EmployeeID,FirstName,LastName,Title FROM Employees">
      </asp:SqlDataSource>

      <hr />

      <asp:DetailsView
        id="DetailsView1"
        runat="server"
        DataSourceID="SqlDataSource2"
        AutoGenerateRows="False"
        AutoGenerateInsertButton="True">
        <fields>
          <asp:BoundField HeaderText="First Name" DataField="FirstName" ReadOnly="False"/>
          <asp:BoundField HeaderText="Last Name" DataField="LastName" ReadOnly="False"/>
          <asp:TemplateField HeaderText="Title">
            <ItemTemplate>
              <asp:DropDownList
                id="TitleDropDownList"
                runat="server"
                selectedvalue="<%# Bind('Title') %>" >
                <asp:ListItem Selected="True">Sales Representative</asp:ListItem>
                <asp:ListItem>Sales Manager</asp:ListItem>
                <asp:ListItem>Vice President, Sales</asp:ListItem>
              </asp:DropDownList>
            </ItemTemplate>
          </asp:TemplateField>
          <asp:BoundField HeaderText="Notes" DataField="Notes" ReadOnly="False"/>
        </fields>
      </asp:DetailsView>


      <asp:SqlDataSource
        id="SqlDataSource2"
        runat="server"
        ConnectionString="<%$ ConnectionStrings:MyNorthwind%>"
        SelectCommand="SELECT * FROM Employees"
        InsertCommandType = "StoredProcedure"
        InsertCommand="sp_insertemployee"        
        OnInserting="On_Inserting"
        OnInserted ="On_Inserted"
        FilterExpression="EmployeeID={0}">
        <FilterParameters>
          <asp:ControlParameter Name="EmployeeID" ControlId="GridView1" PropertyName="SelectedValue" />
        </FilterParameters>
      </asp:SqlDataSource>

<!-- 
     -- An example sp_insertemployee stored procedure that returns
     -- the primary key of the row that was inserted in an OUT parameter.
     CREATE PROCEDURE sp_insertemployee 
        @FirstName nvarchar(10), 
        @LastName nvarchar(20) , 
        @Title nvarchar(30), 
        @Notes nvarchar(200), 
        @PK_New int OUTPUT
      AS
        INSERT INTO Employees(FirstName,LastName,Title,Notes)VALUES (@FirstName,@LastName,@Title,@Notes)
        SELECT @PK_New = @@IDENTITY
        RETURN (1)    
      GO
-->      

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

Comentarios

Cuando se genera un evento, se invoca el controlador de eventos a través de un delegado.Raising an event invokes the event handler through a 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.

El método OnInserting también permite que las clases derivadas controlen el evento sin adjuntar ningún delegado.The OnInserting method also allows derived classes to handle the event without attaching a delegate. Ésta es la técnica preferida para controlar el evento en una clase derivada.This is the preferred technique for handling the event in a derived class.

Notas a los desarrolladores de herederos

Al reemplazar el OnInserting(SqlDataSourceCommandEventArgs) método en una clase derivada, asegúrese de llamar al OnInserting(SqlDataSourceCommandEventArgs) método de la clase base para que los delegados registrados reciban el evento.When overriding the OnInserting(SqlDataSourceCommandEventArgs) method in a derived class, be sure to call the OnInserting(SqlDataSourceCommandEventArgs) method for the base class so that registered delegates receive the event.

Se aplica a