ListViewInsertEventArgs Clase

Definición

Proporciona datos para el evento ItemInserting.Provides data for the ItemInserting event.

public ref class ListViewInsertEventArgs : System::ComponentModel::CancelEventArgs
public class ListViewInsertEventArgs : System.ComponentModel.CancelEventArgs
type ListViewInsertEventArgs = class
    inherit CancelEventArgs
Public Class ListViewInsertEventArgs
Inherits CancelEventArgs
Herencia
ListViewInsertEventArgs

Ejemplos

En el ejemplo siguiente se muestra cómo usar el objeto ListViewInsertEventArgs para cancelar una operación de inserción si el elemento de datos contiene un valor vacío.The following example shows how to use the ListViewInsertEventArgs object to cancel an insert operation if the data item contains an empty value.

Importante

Este ejemplo contiene un cuadro de texto que acepta datos proporcionados por el usuario, que es una posible amenaza de seguridad.This example contains a text box that accepts user input, which is a potential security threat. De forma predeterminada, ASP.NET Web Pages valida que los datos proporcionados por el usuario no incluyen elementos HTML ni de script.By default, ASP.NET Web pages validate that user input does not include script or HTML elements. Para más información, consulte Información general sobre los ataques mediante scripts.For more information, see Script Exploits Overview.

<%@ 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 Page_Load()
  {
    Message.Text = String.Empty;
  }

  //<Snippet2>
  void ContactsListView_ItemInserting(Object sender, ListViewInsertEventArgs e)
  {
    // Iterate through the values to verify if they are not empty.
    foreach (DictionaryEntry de in e.Values)
    {
      if (de.Value == null)
      {
        Message.Text = "Cannot insert an empty value.";
        e.Cancel = true;
      }
    }
  }
  //</Snippet2>

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView.ItemInserting Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView.ItemInserting Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
     
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemInserting="ContactsListView_ItemInserting"  
        InsertItemPosition="LastItem"
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" border="1" runat="server" id="tblProducts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|&lt;&lt; " LastPageText=" &gt;&gt;|"
                NextPageText=" &gt; " PreviousPageText=" &lt; " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
              &nbsp;
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
              &nbsp;
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#B0C4DE">
            <td valign="top">
              <asp:Label runat="server" ID="FirstNameLabel" 
                AssociatedControlID="FirstNameTextBox" Text="First Name"/>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="LastNameLabel" 
                AssociatedControlID="LastNameTextBox" Text="Last Name" />
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="EmailLabel" 
                AssociatedControlID="EmailTextBox" Text="Email" />
              <asp:TextBox ID="EmailTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
            </td>
          </tr>
        </InsertItemTemplate>
      </asp:ListView>
            
      <asp:SqlDataSource ID="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] 
          FROM Person.Contact"
        InsertCommand="INSERT INTO Person.Contact
                       ([FirstName], [LastName], [EmailAddress], [PasswordHash], [PasswordSalt]) 
                       Values(@FirstName, @LastName, @EmailAddress, '', '');
                       SELECT @ContactID = SCOPE_IDENTITY()">
        <InsertParameters>
          <asp:Parameter Name="FirstName" />
          <asp:Parameter Name="LastName" />
          <asp:Parameter Name="EmailAddress" />
          <asp:Parameter Name="ContactID" Type="Int32" Direction="Output" />
        </InsertParameters>
      </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 Page_Load()
    Message.Text = String.Empty
  End Sub

  '<Snippet2>
  Sub ContactsListView_ItemInserting(ByVal sender As Object, _
                                     ByVal e As ListViewInsertEventArgs)
  
    ' Iterate through the values to verify if they are not empty.
    For Each de As DictionaryEntry In e.Values
      If de.Value Is Nothing Then
        Message.Text = "Cannot insert an empty value."
        e.Cancel = True
      End If
    Next
  End Sub
  '</Snippet2>

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView.ItemInserting Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView.ItemInserting Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
     
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemInserting="ContactsListView_ItemInserting"  
        InsertItemPosition="LastItem"
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" border="1" runat="server" id="tblProducts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|&lt;&lt; " LastPageText=" &gt;&gt;|"
                NextPageText=" &gt; " PreviousPageText=" &lt; " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
              &nbsp;
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
              &nbsp;
            </td>
          </tr>
        </ItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#B0C4DE">
            <td valign="top">
              <asp:Label runat="server" ID="FirstNameLabel" 
                AssociatedControlID="FirstNameTextBox" Text="First Name"/>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="LastNameLabel" 
                AssociatedControlID="LastNameTextBox" Text="Last Name" />
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="EmailLabel" 
                AssociatedControlID="EmailTextBox" Text="Email" />
              <asp:TextBox ID="EmailTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" />
            </td>
          </tr>
        </InsertItemTemplate>
      </asp:ListView>
            
      <asp:SqlDataSource ID="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] 
          FROM Person.Contact"
        InsertCommand="INSERT INTO Person.Contact
                       ([FirstName], [LastName], [EmailAddress], [PasswordHash], [PasswordSalt]) 
                       Values(@FirstName, @LastName, @EmailAddress, '', '');
                       SELECT @ContactID = SCOPE_IDENTITY()">
        <InsertParameters>
          <asp:Parameter Name="FirstName" />
          <asp:Parameter Name="LastName" />
          <asp:Parameter Name="EmailAddress" />
          <asp:Parameter Name="ContactID" Type="Int32" Direction="Output" />
        </InsertParameters>
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

Comentarios

El control ListView provoca el evento ItemInserting cuando se hace clic en un botón Insertar del control, pero antes de que el control ListView Inserte el registro.The ListView control raises the ItemInserting event when an Insert button in the control is clicked, but before the ListView control inserts the record. (Un botón Insertar es un botón cuya propiedad CommandName está establecida en "Insert"). Esto le permite proporcionar un método de control de eventos que realiza una rutina personalizada siempre que se produce este evento.(An Insert button is a button whose CommandName property is set to "Insert".) This enables you to provide an event-handling method that performs a custom routine whenever this event occurs. Por ejemplo, puede validar o codificar en HTML los valores de un registro antes de insertarlo en el origen de datos.For example, you can validate or HTML-encode the values of a record before it is inserted it in the data source.

Se pasa un objeto ListViewInsertEventArgs al método de control de eventos.A ListViewInsertEventArgs object is passed to the event-handling method. Este objeto le permite determinar el valor de un argumento de comando opcional que se envía al control ListView.This object enables you to determine the value of an optional command argument that is sent to the ListView control. Puede tener acceso al objeto ListViewItem que se va a insertar mediante la propiedad Item.You can access the ListViewItem object that is being inserted by using the Item property. También puede leer o modificar los valores de campo del nuevo registro mediante el Values propiedad.You can also read or modify the field values for the new record by using the Values property. Para cancelar la operación de inserción, establezca la propiedad Cancel en true.To cancel the insert operation, set the Cancel property to true.

Para obtener una lista con los valores de propiedad iniciales de una instancia de la clase ListViewInsertEventArgs, vea el constructor ListViewInsertEventArgs.For a list of initial property values for an instance of the ListViewInsertEventArgs class, see the ListViewInsertEventArgs constructor.

Constructores

ListViewInsertEventArgs(ListViewItem)

Inicializa una nueva instancia de la clase ListViewInsertEventArgs.Initializes a new instance of the ListViewInsertEventArgs class.

Propiedades

Cancel

Obtiene o establece un valor que indica si se debe cancelar el evento.Gets or sets a value indicating whether the event should be canceled.

(Heredado de CancelEventArgs)
Item

Obtiene un objeto ListViewItem que representa el elemento de datos que se va a insertar.Gets a ListViewItem object that represents the data item to be inserted.

Values

Obtiene los valores del registro que se va a insertar.Gets the values for the record to insert.

Métodos

Equals(Object)

Determina si el objeto especificado es igual que el objeto actual.Determines whether the specified object is equal to the current object.

(Heredado de Object)
GetHashCode()

Sirve como función hash predeterminada.Serves as the default hash function.

(Heredado de Object)
GetType()

Obtiene el Type de la instancia actual.Gets the Type of the current instance.

(Heredado de Object)
MemberwiseClone()

Crea una copia superficial del objeto Object actual.Creates a shallow copy of the current Object.

(Heredado de Object)
ToString()

Devuelve una cadena que representa el objeto actual.Returns a string that represents the current object.

(Heredado de Object)

Se aplica a

Consulte también: