ListView.Sort(String, SortDirection) Método
Definición
Importante
Parte de la información hace referencia a la versión preliminar del producto, que puede haberse modificado sustancialmente antes de lanzar la versión definitiva. Microsoft no otorga ninguna garantía, explícita o implícita, con respecto a la información proporcionada aquí.
Ordena el control ListView, en función de la expresión y dirección de ordenación especificadas.
public:
virtual void Sort(System::String ^ sortExpression, System::Web::UI::WebControls::SortDirection sortDirection);
public virtual void Sort (string sortExpression, System.Web.UI.WebControls.SortDirection sortDirection);
abstract member Sort : string * System.Web.UI.WebControls.SortDirection -> unit
override this.Sort : string * System.Web.UI.WebControls.SortDirection -> unit
Public Overridable Sub Sort (sortExpression As String, sortDirection As SortDirection)
Parámetros
- sortDirection
- SortDirection
Uno de los valores de SortDirection.
Excepciones
El control ListView está enlazado a un control de origen de datos, pero el objeto DataSourceView asociado al origen de datos es null
.
Ejemplos
En el ejemplo siguiente se muestra cómo usar el Sort método para ordenar mediante programación el ListView control por varios campos de datos.
<%@ 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">
// <Snippet2>
void SortButton_Click(Object sender, EventArgs e)
{
// Create the sort expression from the values selected
// by the user from the DropDownList controls. Multiple
// columns can be sorted by creating a sort expression
// that contains a comma-separated list of field names.
String expression = SortList1.SelectedValue + " " +
DirectionList1.SelectedValue + " ," +
SortList2.SelectedValue;
// Determine the sort direction of the second column.
// The sort direction parameter applies only to the
// last column sorted.
SortDirection direction2 = SortDirection.Ascending;
if (DirectionList2.SelectedValue == "DESC")
direction2 = SortDirection.Descending;
// Use the Sort method to programmatically sort the ListView
// control using the sort expression and direction.
ContactsListView.Sort(expression, direction2);
}
// </Snippet2>
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListView Sort Example</title>
<style type="text/css">
body { font: 10pt Trebuchet MS; }
</style>
</head>
<body>
<form id="form1" runat="server">
<h3>ListView Sort Example</h3>
<table>
<tr>
<td>Sort by:</td>
<td>
<asp:DropDownList ID="SortList1" runat="server">
<asp:ListItem>ContactID</asp:ListItem>
<asp:ListItem Selected="true">FirstName</asp:ListItem>
<asp:ListItem>LastName</asp:ListItem>
<asp:ListItem>EmailAddress</asp:ListItem>
</asp:DropDownList>
</td>
<td>Sort order:</td>
<td>
<asp:DropDownList ID="DirectionList1" runat="server">
<asp:ListItem Value="ASC" Text="Ascending" Selected="True" />
<asp:ListItem Value="DESC" Text="Descending" />
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Then by:</td>
<td>
<asp:DropDownList ID="SortList2" runat="server">
<asp:ListItem>ContactID</asp:ListItem>
<asp:ListItem>FirstName</asp:ListItem>
<asp:ListItem Selected="true">LastName</asp:ListItem>
<asp:ListItem>EmailAddress</asp:ListItem>
</asp:DropDownList>
</td>
<td>Sort order:</td>
<td>
<asp:DropDownList ID="DirectionList2" runat="server">
<asp:ListItem Value="ASC" Text="Ascending" Selected="True" />
<asp:ListItem Value="DESC" Text="Descending" />
</asp:DropDownList>
</td>
</tr>
</table>
<asp:Button id="SortButton"
Text="Sort"
OnClick="SortButton_Click"
runat="server"/>
<br/><br />
<asp:ListView ID="ContactsListView"
DataSourceID="ContactsDataSource"
runat="server">
<LayoutTemplate>
<table cellpadding="2" width="640px" border="1" runat="server" id="tblContacts">
<tr runat="server">
<th runat="server">ContactID</th>
<th runat="server">FirstName</th>
<th runat="server">LastName</th>
<th runat="server">EmailAddress</th>
</tr>
<tr runat="server" id="itemPlaceholder" />
</table>
<asp:DataPager runat="server" ID="ContactsDataPager" PageSize="12">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button"
ShowFirstPageButton="true"
ShowLastPageButton="true" />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td>
<asp:Label ID="ContactIDLabel" runat="server" Text='<%#Eval("ContactID") %>' />
</td>
<td>
<asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
</td>
<td>
<asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
</td>
<td>
<asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
</td>
</tr>
</ItemTemplate>
</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="ContactsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress]
FROM Person.Contact">
</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">
' <Snippet2>
Sub SortButton_Click(ByVal sender As Object, ByVal e As EventArgs)
' Create the sort expression from the values selected
' by the user from the DropDownList controls. Multiple
' columns can be sorted by creating a sort expression
' that contains a comma-separated list of field names.
Dim expression As String = SortList1.SelectedValue & " " & _
DirectionList1.SelectedValue & " ," & SortList2.SelectedValue
' Determine the sort direction of the second column.
' The sort direction parameter applies only to the
' last column sorted.
Dim direction2 As SortDirection = SortDirection.Ascending
If DirectionList2.SelectedValue = "DESC" Then
direction2 = SortDirection.Descending
End If
' Use the Sort method to programmatically sort the ListView
' control using the sort expression and direction.
ContactsListView.Sort(expression, direction2)
End Sub
' </Snippet2>
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>ListView Sort Example</title>
<style type="text/css">
body { font: 10pt Trebuchet MS; }
</style>
</head>
<body>
<form id="form1" runat="server">
<h3>ListView Sort Example</h3>
<table>
<tr>
<td>Sort by:</td>
<td>
<asp:DropDownList ID="SortList1" runat="server">
<asp:ListItem>ContactID</asp:ListItem>
<asp:ListItem Selected="true">FirstName</asp:ListItem>
<asp:ListItem>LastName</asp:ListItem>
<asp:ListItem>EmailAddress</asp:ListItem>
</asp:DropDownList>
</td>
<td>Sort order:</td>
<td>
<asp:DropDownList ID="DirectionList1" runat="server">
<asp:ListItem Value="ASC" Text="Ascending" Selected="True" />
<asp:ListItem Value="DESC" Text="Descending" />
</asp:DropDownList>
</td>
</tr>
<tr>
<td>Then by:</td>
<td>
<asp:DropDownList ID="SortList2" runat="server">
<asp:ListItem>ContactID</asp:ListItem>
<asp:ListItem>FirstName</asp:ListItem>
<asp:ListItem Selected="true">LastName</asp:ListItem>
<asp:ListItem>EmailAddress</asp:ListItem>
</asp:DropDownList>
</td>
<td>Sort order:</td>
<td>
<asp:DropDownList ID="DirectionList2" runat="server">
<asp:ListItem Value="ASC" Text="Ascending" Selected="True" />
<asp:ListItem Value="DESC" Text="Descending" />
</asp:DropDownList>
</td>
</tr>
</table>
<asp:Button id="SortButton"
Text="Sort"
OnClick="SortButton_Click"
runat="server"/>
<br/><br />
<asp:ListView ID="ContactsListView"
DataSourceID="ContactsDataSource"
runat="server">
<LayoutTemplate>
<table cellpadding="2" width="640px" border="1" runat="server" id="tblContacts">
<tr runat="server">
<th runat="server">ContactID</th>
<th runat="server">FirstName</th>
<th runat="server">LastName</th>
<th runat="server">EmailAddress</th>
</tr>
<tr runat="server" id="itemPlaceholder" />
</table>
<asp:DataPager runat="server" ID="ContactsDataPager" PageSize="12">
<Fields>
<asp:NextPreviousPagerField ButtonType="Button"
ShowFirstPageButton="true"
ShowLastPageButton="true" />
</Fields>
</asp:DataPager>
</LayoutTemplate>
<ItemTemplate>
<tr runat="server">
<td>
<asp:Label ID="ContactIDLabel" runat="server" Text='<%#Eval("ContactID") %>' />
</td>
<td>
<asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
</td>
<td>
<asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
</td>
<td>
<asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
</td>
</tr>
</ItemTemplate>
</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="ContactsDataSource" runat="server"
ConnectionString="<%$ ConnectionStrings:AdventureWorks_DataConnectionString %>"
SelectCommand="SELECT [ContactID], [FirstName], [LastName], [EmailAddress]
FROM Person.Contact">
</asp:SqlDataSource>
</form>
</body>
</html>
Comentarios
Use el Sort método para ordenar mediante programación los datos que se muestran en el ListView control mediante la expresión de ordenación y la dirección especificadas. La expresión de ordenación especifica la columna o columnas con las que se va a ordenar. Para ordenar varias columnas, cree una expresión de ordenación que contenga una lista separada por comas de nombres de campo. La dirección de ordenación indica si la ordenación se realiza en orden ascendente o descendente.
Normalmente se usa este método cuando se desea ordenar el contenido del ListView control desde fuera del control, como desde un control diferente de la página. Este método también se usa para establecer mediante programación un criterio de ordenación predeterminado para el ListView control cuando se representa por primera vez.
Este método genera los Sorted eventos y Sorting .