ListViewDeletedEventArgs.ExceptionHandled Özellik

Başvuru

Tanım

Ad Alanı:: System.Web.UI.WebControls

Bütünleştirilmiş Kod:: System.Web.Extensions.dll

Önemli

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Silme işlemi sırasında oluşturulan bir özel durumun olay işleyicisinde işlenip işlenmediğini belirten bir değer alır veya ayarlar.

public:
 property bool ExceptionHandled { bool get(); void set(bool value); };

public bool ExceptionHandled { get; set; }

member this.ExceptionHandled : bool with get, set

Public Property ExceptionHandled As Boolean

Özellik Değeri

Boolean

true özel durum olay işleyicisinde işlendiyse; aksi takdirde , false. false varsayılan değerdir.

Örnekler

Aşağıdaki örnek, özel durumun olay işleyicisinde işlendiğini belirtmek için özelliğinin nasıl kullanılacağını ExceptionHandled gösterir.

<%@ 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;
    }
    
    void ContactsListView_ItemDeleted(Object sender, ListViewDeletedEventArgs e)
    {
        // Determine whether an exception occurred during the delete operation.
        if (e.Exception == null)
        {
            // Ensure that a record was deleted.
            if (e.AffectedRows > 0)
            {
                Message.Text = e.AffectedRows + " item(s) deleted successfully.";
            }
            else
            {
                Message.Text = "No item was deleted.";
            }
        }
        else
        {
            // Insert the code to handle the exception here.

            // Indicate that the exception has been handled.
            e.ExceptionHandled = true;
            Message.Text = "An error occurred during the delete operation.";
        }
    }
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>ListViewDeletedEventArgs Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListViewDeletedEventArgs Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
            
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemDeleted="ContactsListView_ItemDeleted"  
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" runat="server" id="tblContacts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|<< " LastPageText=" >>|"
                NextPageText=" > " PreviousPageText=" < " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
            <td>
              <asp:LinkButton ID="DeleteButton" runat="server" 
                CommandName="Delete" 
                Text="Delete" 
                OnClientClick="return confirm('Are you sure?');" />
            </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"
        DeleteCommand="DELETE FROM Person.Contact WHERE [ContactID] = @ContactID">
        <DeleteParameters>
            <asp:Parameter Name="ContactID" Type="Int32" />
        </DeleteParameters>
      </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
    
    Sub ContactsListView_ItemDeleted(sender As Object, e As ListViewDeletedEventArgs)

        ' Determine whether an exception occurred during the delete operation.
        If e.Exception Is Nothing Then
            ' Ensure that a record was deleted.
            If e.AffectedRows > 0 Then
                Message.Text = e.AffectedRows.ToString() & _
                    " item(s) deleted successfully."
            Else
                Message.Text = "No item was deleted."
            End If
        Else
            ' Insert the code to handle the exception here.

            ' Indicate that the exception has been handled.
            e.ExceptionHandled = true
            Message.Text = "An error occurred during the delete operation."
        End If
    End Sub
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head id="Head1" runat="server">
    <title>ListViewDeletedEventArgs Example</title>
  </head>
  <body>
    <form id="form1" runat="server">
        
      <h3>ListViewDeletedEventArgs Example</h3>
            
      <asp:Label ID="Message"
        ForeColor="Red"          
        runat="server"/>
      <br/>
            
      <asp:ListView ID="ContactsListView" 
        DataSourceID="ContactsDataSource" 
        DataKeyNames="ContactID"
        OnItemDeleted="ContactsListView_ItemDeleted"  
        runat="server">
        <LayoutTemplate>
          <table cellpadding="2" runat="server" id="tblContacts" width="640px">
            <tr runat="server" id="itemPlaceholder" />
          </table>
          <asp:DataPager runat="server" ID="PeopleDataPager" PageSize="12">
            <Fields>
              <asp:NextPreviousPagerField 
                ShowFirstPageButton="true" ShowLastPageButton="true"
                FirstPageText="|<< " LastPageText=" >>|"
                NextPageText=" > " PreviousPageText=" < " />
            </Fields>
          </asp:DataPager>
        </LayoutTemplate>
        <ItemTemplate>
          <tr runat="server">
            <td valign="top">
              <asp:Label ID="FirstNameLabel" runat="server" Text='<%#Eval("FirstName") %>' />
              <asp:Label ID="LastNameLabel" runat="server" Text='<%#Eval("LastName") %>' />
            </td>
            <td>
              <asp:Label ID="EmailLabel" runat="server" Text='<%#Eval("EmailAddress") %>' />
            </td>
            <td>
              <asp:LinkButton ID="DeleteButton" runat="server" 
                CommandName="Delete" 
                Text="Delete" 
                OnClientClick="return confirm('Are you sure?');" />
            </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"
        DeleteCommand="DELETE FROM Person.Contact WHERE [ContactID] = @ContactID">
        <DeleteParameters>
            <asp:Parameter Name="ContactID" Type="Int32" />
        </DeleteParameters>
      </asp:SqlDataSource>
      
    </form>
  </body>
</html>

Açıklamalar

Silme işlemi sırasında bir özel durum oluştuğunda, olay sırasında özel durumu işleyip işlemeyeceğinizi belirtmek için özelliğini kullanın ExceptionHandled . Bu özellik olarak trueayarlanırsa, özel durum işlenmiş olarak kabul edilir ve yeniden atılmaz. Bu özellik olarak falseListView ayarlanırsa, denetim özel durumu yeniden oluşturur. Hangi özel durumun oluşturulduğuna Exception karar vermek için özelliğini kullanın.

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