ListView.EditItem Propiedad

  • Referencia

Definición

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

Obtiene el elemento que está en modo de edición en un control ListView.

public:
 virtual property System::Web::UI::WebControls::ListViewItem ^ EditItem { System::Web::UI::WebControls::ListViewItem ^ get(); };
[System.ComponentModel.Browsable(false)]
public virtual System.Web.UI.WebControls.ListViewItem EditItem { get; }
[<System.ComponentModel.Browsable(false)>]
member this.EditItem : System.Web.UI.WebControls.ListViewItem
Public Overridable ReadOnly Property EditItem As ListViewItem

Valor de propiedad

ListViewItem

Elemento que está en modo de edición en un control ListView o null si no hay ningún elemento en modo de edición.

Atributos
BrowsableAttribute

Ejemplos

En el ejemplo siguiente se muestra cómo recuperar el elemento que está en modo de edición mediante la EditItem propiedad para tener acceso a los controles contenidos en la EditItemTemplate plantilla.

Importante

Este ejemplo tiene un cuadro de texto que acepta datos proporcionados por el usuario, lo que puede suponer una amenaza para la seguridad. De forma predeterminada, ASP.NET Web Pages valida que los datos proporcionados por el usuario no incluyen elementos HTML ni de script. Para más información, consulte Información general sobre los ataques mediante scripts.

<%@ 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 ProductsListView_ItemEditing(Object sender, ListViewEditEventArgs e)
  {
    ListViewItem item = ProductsListView.Items[e.NewEditIndex];
    Label dateLabel = (Label)item.FindControl("DiscontinuedDateLabel");
    
    if (String.IsNullOrEmpty(dateLabel.Text))
      return;
    
    //Verify if the item is discontinued.
    DateTime discontinuedDate = DateTime.Parse(dateLabel.Text);
    if (discontinuedDate < DateTime.Now)
    {
      Message.Text = "You cannot edit a discontinued item.";
      e.Cancel = true;
      ProductsListView.SelectedIndex = -1;
    }       
  }
  //</Snippet2>

  void DiscontinuedDateCalendar_OnSelectionChanged(Object sender, EventArgs e)
  {
    TextBox dateTextBox = 
      (TextBox)ProductsListView.EditItem.FindControl("DiscontinuedDateTextBox");
    Calendar calendarObject = (Calendar)sender;
    dateTextBox.Text = calendarObject.SelectedDate.ToString("d");
  }

  DateTime GetDateTime(object dateValue)
  {
    if (dateValue == DBNull.Value)
      return DateTime.Now;
    else
      return (DateTime)dateValue;
  }

  protected void ProductsListView_PagePropertiesChanging(object sender, PagePropertiesChangingEventArgs e)
  {
    // Clears the edit index selection when paging.
    ProductsListView.EditIndex = -1;
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView Edit Item Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView Edit Item Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
     
      <asp:ListView ID="ProductsListView" 
        DataSourceID="ProductsDataSource" 
        DataKeyNames="ProductID"
        OnItemEditing="ProductsListView_ItemEditing" 
        ConvertEmptyStringToNull="true"        
        OnPagePropertiesChanging="ProductsListView_PagePropertiesChanging"
        runat="server" >
        <LayoutTemplate>
          <table cellpadding="2" runat="server" id="tblProducts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="ProductsDataPager" 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:LinkButton ID="EditButton" runat="server" Text="Edit" CommandName="Edit" />
            </td>
            <td valign="top">
              <asp:Label ID="NameLabel" runat="server" Text='<%#Eval("Name") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="ProductNumberLabel" runat="server" Text='<%#Eval("ProductNumber") %>' />
            </td>
            <td>
              <asp:Label ID="DiscontinuedDateLabel" runat="server" 
                Text='<%#Eval("DiscontinuedDate", "{0:d}") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <EditItemTemplate>
          <tr style="background-color:#ADD8E6">
            <td valign="top">
              <asp:LinkButton ID="UpdateButton" runat="server" 
                CommandName="Update" Text="Update" /><br />
              <asp:LinkButton ID="CancelButton" runat="server" 
                CommandName="Cancel" Text="Cancel" />
            </td>
            <td valign="top" colspan="2">
              <asp:Label runat="server" ID="NameLabel" 
                AssociatedControlID="NameTextBox" 
                Text="Name"/>
              <asp:TextBox ID="NameTextBox" runat="server" 
                Text='<%#Bind("Name") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="ProductNumberLabel" 
                AssociatedControlID="ProductNumberTextBox" 
                Text="Product Number" />
              <asp:TextBox ID="ProductNumberTextBox" runat="server" 
                Text='<%#Bind("ProductNumber") %>' MaxLength="25" /><br />
            </td>
            <td>
              <asp:Label runat="server" ID="DiscontinuedDateLabel" 
                AssociatedControlID="DiscontinuedDateTextBox" 
                Text="Discontinued Date"/>
              <asp:TextBox ID="DiscontinuedDateTextBox" runat="server" 
                Text='<%# Bind("DiscontinuedDate", "{0:d}") %>'
                MaxLength="10" /><br />
              <asp:Calendar ID="DiscontinuedDateCalendar" runat="server" 
                SelectedDate='<%# GetDateTime(Eval("DiscontinuedDate")) %>'
                OnSelectionChanged="DiscontinuedDateCalendar_OnSelectionChanged" />
            </td>
          </tr>
        </EditItemTemplate>
      </asp:ListView>

      <!-- 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="ProductsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [DiscontinuedDate] 
          FROM Production.Product"
        UpdateCommand="UPDATE Production.Product
          SET Name = @Name, ProductNumber = @ProductNumber, DiscontinuedDate = @DiscontinuedDate
          WHERE ProductID = @ProductID">
      </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 ProductsListView_ItemEditing(ByVal sender As Object, ByVal e As ListViewEditEventArgs)
    Dim item As ListViewItem = ProductsListView.Items(e.NewEditIndex)
    Dim dateLabel As Label = CType(item.FindControl("DiscontinuedDateLabel"), Label)
      
    If String.IsNullOrEmpty(dateLabel.Text) Then _
      Return
      
    'Verify if the item is discontinued.
    Dim discontinuedDate As DateTime = DateTime.Parse(dateLabel.Text)
    If discontinuedDate < DateTime.Now Then
      Message.Text = "You cannot edit a discontinued item."
      e.Cancel = True
      ProductsListView.SelectedIndex = -1
    End If
  End Sub
  '</Snippet2>
  
  Sub DiscontinuedDateCalendar_OnSelectionChanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim dateTextBox As TextBox = _
      CType(ProductsListView.EditItem.FindControl("DiscontinuedDateTextBox"), TextBox)
    Dim calendarObject As Calendar = CType(sender, Calendar)
    dateTextBox.Text = calendarObject.SelectedDate.ToString("d")
  End Sub

  Function GetDateTime(ByVal dateValue As Object) As DateTime
    If dateValue Is DBNull.Value Then
      Return DateTime.Now
    Else
      Return CType(dateValue, DateTime)
    End If
  End Function
  
  Protected Sub ProductsListView_PagePropertiesChanging(ByVal sender As Object, _
                                               ByVal e As PagePropertiesChangingEventArgs)
    ' Clears the edit index selection when paging.
    ProductsListView.EditIndex = -1
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView Edit Item Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView Edit Item Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
     
      <asp:ListView ID="ProductsListView" 
        DataSourceID="ProductsDataSource" 
        DataKeyNames="ProductID"
        OnItemEditing="ProductsListView_ItemEditing" 
        ConvertEmptyStringToNull="true"        
        OnPagePropertiesChanging="ProductsListView_PagePropertiesChanging"
        runat="server" >
        <LayoutTemplate>
          <table cellpadding="2" runat="server" id="tblProducts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="ProductsDataPager" 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:LinkButton ID="EditButton" runat="server" Text="Edit" CommandName="Edit" />
            </td>
            <td valign="top">
              <asp:Label ID="NameLabel" runat="server" Text='<%#Eval("Name") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="ProductNumberLabel" runat="server" Text='<%#Eval("ProductNumber") %>' />
            </td>
            <td>
              <asp:Label ID="DiscontinuedDateLabel" runat="server" 
                Text='<%#Eval("DiscontinuedDate", "{0:d}") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <EditItemTemplate>
          <tr style="background-color:#ADD8E6">
            <td valign="top">
              <asp:LinkButton ID="UpdateButton" runat="server" 
                CommandName="Update" Text="Update" /><br />
              <asp:LinkButton ID="CancelButton" runat="server" 
                CommandName="Cancel" Text="Cancel" />
            </td>
            <td valign="top" colspan="2">
              <asp:Label runat="server" ID="NameLabel" 
                AssociatedControlID="NameTextBox" 
                Text="Name"/>
              <asp:TextBox ID="NameTextBox" runat="server" 
                Text='<%#Bind("Name") %>' MaxLength="50" /><br />
              <asp:Label runat="server" ID="ProductNumberLabel" 
                AssociatedControlID="ProductNumberTextBox" 
                Text="Product Number" />
              <asp:TextBox ID="ProductNumberTextBox" runat="server" 
                Text='<%#Bind("ProductNumber") %>' MaxLength="25" /><br />
            </td>
            <td>
              <asp:Label runat="server" ID="DiscontinuedDateLabel" 
                AssociatedControlID="DiscontinuedDateTextBox" 
                Text="Discontinued Date"/>
              <asp:TextBox ID="DiscontinuedDateTextBox" runat="server" 
                Text='<%# Bind("DiscontinuedDate", "{0:d}") %>'
                MaxLength="10" /><br />
              <asp:Calendar ID="DiscontinuedDateCalendar" runat="server" 
                SelectedDate='<%# GetDateTime(Eval("DiscontinuedDate")) %>'
                OnSelectionChanged="DiscontinuedDateCalendar_OnSelectionChanged" />
            </td>
          </tr>
        </EditItemTemplate>
      </asp:ListView>

      <!-- 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="ProductsDataSource" runat="server" 
        ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
        SelectCommand="SELECT [ProductID], [Name], [ProductNumber], [DiscontinuedDate] 
          FROM Production.Product"
        UpdateCommand="UPDATE Production.Product
          SET Name = @Name, ProductNumber = @ProductNumber, DiscontinuedDate = @DiscontinuedDate
          WHERE ProductID = @ProductID">
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

Comentarios

Utilice la EditItem propiedad para tener acceso al elemento que está en modo de edición en un ListView control . El contenido de un elemento de edición se define mediante la EditItemTemplate propiedad .

Se aplica a

Consulte también