ListViewDeletedEventArgs.Values Propiedad

  • Referencia

Definición

Espacio de nombres:
System.Web.UI.WebControls
Ensamblado:
System.Web.Extensions.dll

Obtiene los valores de campo no de clave para el elemento eliminado.

public:
 property System::Collections::Specialized::IOrderedDictionary ^ Values { System::Collections::Specialized::IOrderedDictionary ^ get(); };
public System.Collections.Specialized.IOrderedDictionary Values { get; }
member this.Values : System.Collections.Specialized.IOrderedDictionary
Public ReadOnly Property Values As IOrderedDictionary

Valor de propiedad

IOrderedDictionary

Valores de campo no de clave para el elemento eliminado.

Ejemplos

En el ejemplo siguiente se muestra cómo usar la Values propiedad para tener acceso a los valores de los campos que no son de clave para un elemento eliminado.

<%@ 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 ContactsListView_ItemDeleted(Object sender, ListViewDeletedEventArgs e)
  {
    // Display the value of the key fields in the Keys property.
    KeysMessageLabel.Text =
      "The key fields for the deleted record are: <br/>";

    foreach (DictionaryEntry entry in e.Keys)
    {
      DisplayValue(entry, KeysMessageLabel);
    }

    // Display the value of the non-key fields in the Values 
    // property.
    ValuesMessageLabel.Text =
      "The non-key fields for the deleted record are: <br/>";

    foreach (DictionaryEntry entry in e.Values)
    {
      DisplayValue(entry, ValuesMessageLabel);
    }

  }

  void DisplayValue(DictionaryEntry entry, Label displayLabel)
  {
    // Display the field name contained in the DictionaryEntry object.
    if (entry.Key != null)
    {
      displayLabel.Text += "Name=" + entry.Key.ToString() + ", ";
    }
    else
    {
      displayLabel.Text += "Name=null, ";
    }

    // Display the field value contained in the DictionaryEntry object.
    if (entry.Value != null)
    {
      displayLabel.Text += "Value=" + entry.Value.ToString() + "<br/>";
    }
    else
    {
      displayLabel.Text += "Value=null<br/>";
    }
  }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ListViewDeletedEventArgs Keys and Values Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListViewDeletedEventArgs Keys and Values Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
                
      <br/>
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemDeleted="ContactsListView_ItemDeleted"  
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" runat="server" id="tblContacts" width="640px">
            <tr id="itemPlaceholder" runat="server"></tr>
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|<< " LastPageText=" >>|"
                NextPageText=" > " PreviousPageText=" < " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Bind("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Bind("LastName") %>' />
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Bind("EmailAddress") %>' />
            </td>
            <td>
              <asp:LinkButton ID="DeleteButton" runat="server" 
                CommandName="Delete" 
                Text="Delete" 
                OnClientClick="return confirm('Are you sure?');" />
            </td>
          </tr>
        </ItemTemplate>
      </asp:ListView>
                 
      <br/><br />
         
      <asp:Label ID="KeysMessageLabel"
        ForeColor="Red"
        runat="server"/>
          
      <br/>
          
      <asp:Label ID="ValuesMessageLabel"
        ForeColor="Red"
        runat="server"/>
            
      <!-- 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="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] FROM Person.Contact"
        DeleteCommand="DELETE FROM Person.Contact WHERE [ContactID] = @ContactID">
          <DeleteParameters>
              <asp:Parameter Name="ContactID" Type="Int32" />
          </DeleteParameters>
      </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 ContactsListView_ItemDeleted(sender As Object, e As ListViewDeletedEventArgs)

    ' Display the value of the key fields in the Keys property.
    KeysMessageLabel.Text = _
      "The key fields for the deleted record are: <br/>"

    For Each entry As DictionaryEntry In e.Keys
      DisplayValue(entry, KeysMessageLabel)
    Next

    ' Display the value of the non-key fields in the Values 
    ' property.
    ValuesMessageLabel.Text = _
      "The non-key fields for the deleted record are: <br/>"

    For Each entry As DictionaryEntry In e.Values
      DisplayValue(entry, ValuesMessageLabel)
    Next
  End Sub

  Sub DisplayValue(entry As DictionaryEntry, displayLabel As Label)

    ' Display the field name contained in the DictionaryEntry object.
    If entry.Key IsNot Nothing Then
      displayLabel.Text &= "Name=" & entry.Key.ToString() & ", "
    Else
      displayLabel.Text &= "Name=null, "
    End If

    ' Display the field value contained in the DictionaryEntry object.
    If entry.Value IsNot Nothing
      displayLabel.Text &= "Value=" & entry.Value.ToString() & "<br/>"
    else
      displayLabel.Text &= "Value=null<br/>"
    End If
  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListViewDeletedEventArgs Keys and Values Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListViewDeletedEventArgs Keys and Values Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
                
      <br/>
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemDeleted="ContactsListView_ItemDeleted"  
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" runat="server" id="tblContacts" width="640px">
            <tr id="itemPlaceholder" runat="server"></tr>
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|<< " LastPageText=" >>|"
                NextPageText=" > " PreviousPageText=" < " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Bind("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Bind("LastName") %>' />
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Bind("EmailAddress") %>' />
            </td>
            <td>
              <asp:LinkButton ID="DeleteButton" runat="server" 
                CommandName="Delete" 
                Text="Delete" 
                OnClientClick="return confirm('Are you sure?');" />
            </td>
          </tr>
        </ItemTemplate>
      </asp:ListView>
                 
      <br/><br />
         
      <asp:Label ID="KeysMessageLabel"
        ForeColor="Red"
        runat="server"/>
          
      <br/>
          
      <asp:Label ID="ValuesMessageLabel"
        ForeColor="Red"
        runat="server"/>
            
      <!-- 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="ContactsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress] FROM Person.Contact"
        DeleteCommand="DELETE FROM Person.Contact WHERE [ContactID] = @ContactID">
          <DeleteParameters>
              <asp:Parameter Name="ContactID" Type="Int32" />
          </DeleteParameters>
      </asp:SqlDataSource>

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

Comentarios

Use la Values propiedad para tener acceso a los valores de los campos que no son de clave para un elemento eliminado. Por ejemplo, puede usar estos valores para mantener un registro de elementos eliminados.

Nota

La Values propiedad solo se rellena cuando se usan expresiones de enlace bidireccionales en las ListView plantillas, como la ItemTemplate plantilla. Para obtener más información sobre las expresiones de enlace bidireccionales, vea Sintaxis de expresión de enlace de datos.

La propiedad Values devuelve un objeto que implementa la interfaz IOrderedDictionary. El objeto contiene DictionaryEntry objetos que representan los campos que no son clave del elemento eliminado.

Nota

Esta propiedad no contiene los campos de clave (según lo especificado por la ListView.DataKeyNames propiedad) para el elemento eliminado. Para acceder a los campos de clave, use la Keys propiedad .

Se aplica a

Consulte también