ListViewSortEventArgs Klass

Definition

Namnområde:
System.Web.UI.WebControls
Sammansättning:
System.Web.Extensions.dll

Innehåller data för Sorting händelsen.

public ref class ListViewSortEventArgs : System::ComponentModel::CancelEventArgs
public class ListViewSortEventArgs : System.ComponentModel.CancelEventArgs
type ListViewSortEventArgs = class
    inherit CancelEventArgs
Public Class ListViewSortEventArgs
Inherits CancelEventArgs
Arv
Object
EventArgs
CancelEventArgs
ListViewSortEventArgs

Exempel

I följande exempel visas hur du använder ListViewSortEventArgs objektet för att visa sorteringsriktningen och kolumnen som sorteras.

<%@ 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 ContactsListView_Sorting(Object sender, ListViewSortEventArgs e)
  {
    // Check the sort direction to set the image URL accordingly.
    string imgUrl;
    if (e.SortDirection == SortDirection.Ascending)
      imgUrl = "~/images/ascending.gif";
    else
      imgUrl = "~/images/descending.gif";
      
    // Check which field is being sorted
    // to set the visibility of the image controls.
    Image sortImage1 = (Image) ContactsListView.FindControl("SortImage1");
    Image sortImage2 = (Image)ContactsListView.FindControl("SortImage2");
    Image sortImage3 = (Image)ContactsListView.FindControl("SortImage3");
    switch (e.SortExpression)
    {
      case "FirstName":
        sortImage1.Visible = true;
        sortImage1.ImageUrl = imgUrl;
        sortImage2.Visible = false;
        sortImage3.Visible = false;
        break;
      case "LastName":
        sortImage1.Visible = false;
        sortImage2.Visible = true;
        sortImage2.ImageUrl = imgUrl;
        sortImage3.Visible = false;
        break;
      case "EmailAddress":
        sortImage1.Visible = false;
        sortImage2.Visible = false;
        sortImage3.Visible = true;
        sortImage3.ImageUrl = imgUrl;
        break;
    }
  }
  //</Snippet2>
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView Sorting Example</title>
    <style type="text/css">
      body  { font: 10pt Trebuchet MS, Arial, Tahoma; }
      td { border: 1px solid #E6E6FA; }
      .header {	background: #B0C4DE; }
      .alternatingItem { background: #edf5fd; }
    </style>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView Sorting Example</h3>
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        OnSorting="ContactsListView_Sorting"
        runat="server">
        <LayoutTemplate>
          <table width="640px" runat="server" id="tblContacts">
            <tr class="header" align="center" runat="server">
              <td>
                <asp:LinkButton runat="server" ID="SortByFirstNameButton"
                  CommandName="Sort" Text="First Name" 
                  CommandArgument="FirstName"/>
                <asp:Image runat="server" ID="SortImage1" 
                  ImageUrl="~/images/ascending.gif" Visible="false" />
              </td>
              <td>
                <asp:LinkButton runat="server" ID="SortByLastNameButton"
                  CommandName="Sort" Text="Last Name"
                  CommandArgument="LastName" />
                <asp:Image runat="server" ID="SortImage2" 
                  ImageUrl="~/images/ascending.gif" Visible="false" />
              </td>
              <td>
                <asp:LinkButton runat="server" ID="SortByEmailButton"
                  CommandName="Sort" Text="Email Address" 
                  CommandArgument="EmailAddress" />
                <asp:Image runat="server" ID="SortImage3" 
                  ImageUrl="~/images/ascending.gif" Visible="false" />
              </td>
            </tr>
            <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>
              <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="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <AlternatingItemTemplate>
          <tr class="alternatingItem" runat="server">
            <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="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </AlternatingItemTemplate>
      </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 ContactsListView_Sorting(ByVal sender As Object, ByVal e As ListViewSortEventArgs) 
  
    ' Check the sort direction to set the image URL accordingly.
    Dim imgUrl As String
    If e.SortDirection = SortDirection.Ascending Then
      imgUrl = "~/images/ascending.gif"
    Else
      imgUrl = "~/images/descending.gif"
    End If
    
    ' Check which field is being sorted
    ' to set the visibility of the image controls.
    Dim sortImage1 As Image = CType(ContactsListView.FindControl("SortImage1"), Image)
    Dim sortImage2 As Image = CType(ContactsListView.FindControl("SortImage2"), Image)
    Dim sortImage3 As Image = CType(ContactsListView.FindControl("SortImage3"), Image)
    
    Select Case e.SortExpression
      Case "FirstName"
        sortImage1.Visible = True
        sortImage1.ImageUrl = imgUrl
        sortImage2.Visible = False
        sortImage3.Visible = False
      Case "LastName"
        sortImage1.Visible = False
        sortImage2.Visible = True
        sortImage2.ImageUrl = imgUrl
        sortImage3.Visible = False
      Case "EmailAddress"
        sortImage1.Visible = False
        sortImage2.Visible = False
        sortImage3.Visible = True
        sortImage3.ImageUrl = imgUrl
    End Select
    
  End Sub
  '</Snippet2>
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView Sorting Example</title>
    <style type="text/css">
      body  { font: 10pt Trebuchet MS, Arial, Tahoma; }
      td { border: 1px solid #E6E6FA; }
      .header {	background: #B0C4DE; }
      .alternatingItem { background: #edf5fd; }
    </style>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView Sorting Example</h3>
      
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        OnSorting="ContactsListView_Sorting"
        runat="server">
        <LayoutTemplate>
          <table width="640px" runat="server" id="tblContacts">
            <tr class="header" align="center" runat="server">
              <td>
                <asp:LinkButton runat="server" ID="SortByFirstNameButton"
                  CommandName="Sort" Text="First Name" 
                  CommandArgument="FirstName"/>
                <asp:Image runat="server" ID="SortImage1" 
                  ImageUrl="~/images/ascending.gif" Visible="false" />
              </td>
              <td>
                <asp:LinkButton runat="server" ID="SortByLastNameButton"
                  CommandName="Sort" Text="Last Name"
                  CommandArgument="LastName" />
                <asp:Image runat="server" ID="SortImage2" 
                  ImageUrl="~/images/ascending.gif" Visible="false" />
              </td>
              <td>
                <asp:LinkButton runat="server" ID="SortByEmailButton"
                  CommandName="Sort" Text="Email Address" 
                  CommandArgument="EmailAddress" />
                <asp:Image runat="server" ID="SortImage3" 
                  ImageUrl="~/images/ascending.gif" Visible="false" />
              </td>
            </tr>
            <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>
              <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="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </ItemTemplate>
        <AlternatingItemTemplate>
          <tr class="alternatingItem" runat="server">
            <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="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
          </tr>
        </AlternatingItemTemplate>
      </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>

Kommentarer

Kontrollen ListView genererar Sorting händelsen när en sorteringsknapp klickas, men innan ListView kontrollen hanterar sorteringsåtgärden. (En sorteringsknapp är en knapp vars CommandName egenskap är inställd på "Sortera".) På så sätt kan du ange en metod för händelsehantering som utför en anpassad rutin när den här händelsen inträffar, till exempel anpassning av sorteringsuttrycket.

Ett ListViewSortEventArgs objekt skickas till metoden för händelsehantering. Med det här objektet kan du ange eller fastställa sorteringsuttrycket och sorteringsriktningen ListView för kontrollen. Använd egenskapen för att fastställa sorteringsuttrycket SortExpression . Använd egenskapen för att fastställa sorteringsriktningen SortDirection . Du kan också avbryta en sorteringsåtgärd genom att ange Cancel egenskapen till true.

En lista över initiala egenskapsvärden för en instans av ListViewSortEventArgs klassen finns i ListViewSelectEventArgs konstruktorn.

Konstruktorer

Name Description
ListViewSortEventArgs(String, SortDirection)

Initierar en ny instans av ListViewSortEventArgs klassen.

Egenskaper

Name Description
Cancel

Hämtar eller anger ett värde som anger om händelsen ska avbrytas.

(Ärvd från CancelEventArgs)
SortDirection

Hämtar eller anger i vilken riktning kontrollen ska sorteras ListView .
SortExpression

Hämtar eller anger det uttryck som används för att sortera objekten ListView i kontrollen.

Metoder

Name Description
Equals(Object)

Avgör om det angivna objektet är lika med det aktuella objektet.

(Ärvd från Object)
GetHashCode()

Fungerar som standard-hash-funktion.

(Ärvd från Object)
GetType()

Hämtar den aktuella instansen Type .

(Ärvd från Object)
MemberwiseClone()

Skapar en ytlig kopia av den aktuella Object.

(Ärvd från Object)
ToString()

Returnerar en sträng som representerar det aktuella objektet.

(Ärvd från Object)

Gäller för

Se även