ListView.Sort(String, SortDirection) Méthode

Définition

Trie le contrôle ListView selon l'expression et le sens de tri spécifiés.

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)

Paramètres

sortExpression
String

Expression de tri avec laquelle trier le contrôle ListView.

sortDirection
SortDirection

Une des valeurs de l'objet SortDirection.

Exceptions

Le contrôle ListView est lié à un contrôle de source de données, mais l'objet DataSourceView associé à la source de données est null.

Exemples

L’exemple suivant montre comment utiliser la Sort méthode pour trier le ListView contrôle par programmation en fonction de plusieurs champs de données.

<%@ 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>

Remarques

Utilisez la Sort méthode pour trier par programmation les données affichées dans le contrôle à l’aide ListView de l’expression de tri et de la direction spécifiées. L’expression de tri spécifie la ou les colonnes avec lesquelles effectuer le tri. Pour trier plusieurs colonnes, créez une expression de tri qui contient une liste de noms de champs séparés par des virgules. Le sens de tri indique si le tri est effectué dans l’ordre croissant ou décroissant.

Vous utilisez généralement cette méthode lorsque vous souhaitez trier le contenu du ListView contrôle à l’extérieur du contrôle, par exemple à partir d’un autre contrôle sur la page. Cette méthode est également utilisée pour définir par programmation un ordre de tri par défaut pour le contrôle lors de ListView son premier rendu.

Cette méthode déclenche les Sorted événements et Sorting .

S’applique à

Voir aussi