ListViewCancelEventArgs Kelas

Referensi

Definisi

Ruang nama:: System.Web.UI.WebControls

Rakitan:: System.Web.Extensions.dll

Penting

Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.

Menyediakan data untuk peristiwa tersebut ItemCanceling .

public ref class ListViewCancelEventArgs : System::ComponentModel::CancelEventArgs

public class ListViewCancelEventArgs : System.ComponentModel.CancelEventArgs

type ListViewCancelEventArgs = class
    inherit CancelEventArgs

Public Class ListViewCancelEventArgs
Inherits CancelEventArgs

Warisan: Object

EventArgs

CancelEventArgs
ListViewCancelEventArgs

Contoh

Contoh berikut menunjukkan cara menggunakan ListViewCancelEventArgs objek untuk menampilkan pesan saat pengguna membatalkan operasi sisipkan atau perbarui dalam ListView kontrol. Objek ListViewCancelEventArgs diteruskan ke metode penanganan peristiwa untuk peristiwa tersebut ItemCanceling .

Penting

Contoh ini berisi kotak teks yang menerima input pengguna, yang merupakan potensi ancaman keamanan. Secara default, ASP.NET halaman Web memvalidasi bahwa input pengguna tidak menyertakan elemen skrip atau HTML. Untuk informasi selengkapnya, lihat Gambaran Umum Eksploitasi Skrip.

<%@ 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>
  protected void ContactsListView_ItemCanceling(object sender, ListViewCancelEventArgs e)
  {
    //Check the operation that raised the event
    if (e.CancelMode == ListViewCancelMode.CancelingEdit)
    {
      // The update operation was canceled. Display the 
      // primary key of the item.
      Message.Text = "Update for the ContactID " + 
        ContactsListView.DataKeys[e.ItemIndex].Value.ToString()  + " canceled.";
    }
    else
    {
      Message.Text = "Insert operation canceled."; 
    }
  }
  // </Snippet2>

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

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView ItemCanceling Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView ItemCanceling Example</h3>
      
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
                 
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        ConvertEmptyStringToNull="true"
        InsertItemPosition="LastItem"
        runat="server" 
        OnItemCanceling="ContactsListView_ItemCanceling" 
        OnPagePropertiesChanging="ContactsListView_PagePropertiesChanging" >
        <LayoutTemplate>
          <table cellpadding="2" width="680px" border="1" runat="server" id="tblContacts">
            <tr runat="server">
              <th runat="server">&nbsp;</th>
              <th runat="server">ID</th>
              <th runat="server">First Name</th>
              <th runat="server">Last Name</th>
              <th runat="server">Email Address</th>
            </tr>
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="ContactsDataPager" 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" /><br />
            </td>
            <td valign="top">
              <asp:Label ID="Label1" runat="server" Text='<%#Eval("ContactID") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
              &nbsp;
            </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="CancelEditButton" runat="server" CommandName="Cancel" Text="Cancel" />
            </td>
            <td>
              <asp:Label ID="Label1" runat="server" Text='<%#Eval("ContactID") %>' />
            </td>
            <td>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:TextBox ID="EmailAddressTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" /><br />
            </td>
          </tr>
        </EditItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#90EE90">
            <td colspan="2">
              <asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" /><br />
              <asp:LinkButton ID="CancelInsertButton" runat="server" CommandName="Cancel" Text="Cancel" />
            </td>              
            <td>
              <asp:TextBox ID="FirstNameITextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" />
            </td>
            <td>
              <asp:TextBox ID="LastNameITextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" />
            </td>
            <td>
              <asp:TextBox ID="EmailAddressITextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" />
           </td>
          </tr>
        </InsertItemTemplate>
      </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"
        InsertCommand="INSERT INTO Person.Contact
                         ([FirstName], [LastName], [EmailAddress], [PasswordHash], [PasswordSalt]) 
                         Values(@FirstName, @LastName, @EmailAddress, '', '')"
        UpdateCommand="UPDATE Person.Contact
                         SET FirstName = @FirstName, LastName = @LastName,
                         EmailAddress = @EmailAddress
                         WHERE ContactID = @ContactID">
      </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>
  Protected Sub ContactsListView_ItemCanceling(ByVal sender As Object, _
                                               ByVal e As ListViewCancelEventArgs)
    'Check the operation that raised the event
    If (e.CancelMode = ListViewCancelMode.CancelingEdit) Then
      ' The update operation was canceled. Display the 
      ' primary key of the item.
      Message.Text = "Update for the ContactID " & _
        ContactsListView.DataKeys(e.ItemIndex).Value.ToString() & " canceled."
    Else
      Message.Text = "Insert operation canceled."
    End If

  End Sub
  ' </Snippet2>
  
  Protected Sub ContactsListView_PagePropertiesChanging(ByVal sender As Object, _
                                               ByVal e As PagePropertiesChangingEventArgs)
    ' Clears the edit index selection when paging.
    ContactsListView.EditIndex = -1
  End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListView ItemCanceling Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListView ItemCanceling Example</h3>
      
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
                 
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        ConvertEmptyStringToNull="true"
        InsertItemPosition="LastItem"
        runat="server" 
        OnItemCanceling="ContactsListView_ItemCanceling" 
        OnPagePropertiesChanging="ContactsListView_PagePropertiesChanging" >
        <LayoutTemplate>
          <table cellpadding="2" width="680px" border="1" runat="server" id="tblContacts">
            <tr runat="server">
              <th runat="server">&nbsp;</th>
              <th runat="server">ID</th>
              <th runat="server">First Name</th>
              <th runat="server">Last Name</th>
              <th runat="server">Email Address</th>
            </tr>
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="ContactsDataPager" 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" /><br />
            </td>
            <td valign="top">
              <asp:Label ID="Label1" runat="server" Text='<%#Eval("ContactID") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td valign="top">
              <asp:Label ID="EmailAddressLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
              &nbsp;
            </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="CancelEditButton" runat="server" CommandName="Cancel" Text="Cancel" />
            </td>
            <td>
              <asp:Label ID="Label1" runat="server" Text='<%#Eval("ContactID") %>' />
            </td>
            <td>
              <asp:TextBox ID="FirstNameTextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:TextBox ID="LastNameTextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" /><br />
            </td>
            <td>
              <asp:TextBox ID="EmailAddressTextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" /><br />
            </td>
          </tr>
        </EditItemTemplate>
        <InsertItemTemplate>
          <tr style="background-color:#90EE90">
            <td colspan="2">
              <asp:LinkButton ID="InsertButton" runat="server" CommandName="Insert" Text="Insert" /><br />
              <asp:LinkButton ID="CancelInsertButton" runat="server" CommandName="Cancel" Text="Cancel" />
            </td>              
            <td>
              <asp:TextBox ID="FirstNameITextBox" runat="server" 
                Text='<%#Bind("FirstName") %>' MaxLength="50" />
            </td>
            <td>
              <asp:TextBox ID="LastNameITextBox" runat="server" 
                Text='<%#Bind("LastName") %>' MaxLength="50" />
            </td>
            <td>
              <asp:TextBox ID="EmailAddressITextBox" runat="server" 
                Text='<%#Bind("EmailAddress") %>' MaxLength="50" />
           </td>
          </tr>
        </InsertItemTemplate>
      </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"
        InsertCommand="INSERT INTO Person.Contact
                         ([FirstName], [LastName], [EmailAddress], [PasswordHash], [PasswordSalt]) 
                         Values(@FirstName, @LastName, @EmailAddress, '', '')"
        UpdateCommand="UPDATE Person.Contact
                         SET FirstName = @FirstName, LastName = @LastName,
                         EmailAddress = @EmailAddress
                         WHERE ContactID = @ContactID">
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

Keterangan

ListView Kontrol menaikkan ItemCanceling peristiwa saat tombol Batal diklik, tetapi sebelum keluar dari mode sisipkan atau edit. (Tombol Batal adalah tombol yang propertinya CommandName diatur ke "Batal") Ini memungkinkan Anda untuk menyediakan metode penanganan peristiwa yang melakukan rutinitas kustom setiap kali peristiwa ini terjadi, seperti menghentikan operasi pembatalan jika akan menempatkan item dalam keadaan yang tidak diinginkan.

Objek ListViewCancelEventArgs diteruskan ke metode penanganan peristiwa. Objek ini memungkinkan Anda menentukan indeks item yang berisi tombol Batalkan yang menaikkan acara. Anda juga dapat menentukan operasi apa yang dibatalkan. Untuk menghentikan operasi pembatalan, atur properti ke Canceltrue.

Untuk daftar nilai properti awal untuk instans ListViewCancelEventArgs kelas, lihat ListViewCancelEventArgs konstruktor.

Konstruktor

ListViewCancelEventArgs(Int32, ListViewCancelMode)

Menginisialisasi instans baru kelas ListViewCancelEventArgs.

Properti

Cancel	Mendapatkan atau menetapkan nilai yang menunjukkan apakah acara harus dibatalkan. (Diperoleh dari CancelEventArgs)
CancelMode	Mendapatkan mode entri data tempat ListView kontrol berada saat tombol Batal diklik.
ItemIndex	Mendapatkan indeks item yang berisi tombol Batalkan yang menaikkan acara.

Metode

Equals(Object)	Menentukan apakah objek yang ditentukan sama dengan objek saat ini. (Diperoleh dari Object)
GetHashCode()	Berfungsi sebagai fungsi hash default. (Diperoleh dari Object)
GetType()	Mendapatkan instans Type saat ini. (Diperoleh dari Object)
MemberwiseClone()	Membuat salinan dangkal dari yang saat ini Object. (Diperoleh dari Object)
ToString()	Mengembalikan string yang mewakili objek saat ini. (Diperoleh dari Object)

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