DetailsViewDeletedEventArgs.Exception 属性

定义

获取在删除操作过程中引发的异常(如果引发)。Gets the exception (if any) that was raised during the delete operation.

public:
 property Exception ^ Exception { Exception ^ get(); };
public Exception Exception { get; }
member this.Exception : Exception
Public ReadOnly Property Exception As Exception

属性值

Exception

一个 Exception 对象,表示删除操作过程中引发的异常。An Exception that represents the exception that was raised during the delete operation.

示例

下面的代码示例演示如何使用 Exception 属性来确定在删除操作过程中是否发生了异常。The following code example demonstrates how to use the Exception property to determine whether an exception occurred during a delete operation.


<%@ 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 StoresDetailView_ItemDeleted(Object sender, 
    DetailsViewDeletedEventArgs e)
  {
    // Use the Exception property to determine whether an exception
    // occurred during the delete operation.
    if (e.Exception == null)
    {
      // Use the AffectedRows property to determine the numbers of
      // rows affected by the delete operation.
      if (e.AffectedRows == 1)
      {
        MessageLabel.Text = e.AffectedRows.ToString() 
          + " record deleted successfully.";
      }
      else
      {
        MessageLabel.Text = e.AffectedRows.ToString() 
          + " records deleted successfully.";
      }
    }
    else
    {
      // Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message;
      
      // Use the ExceptionHandled property to indicate that the 
      // exception is already handled.
      e.ExceptionHandled = true;
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewDeletedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewDeletedEventArgs Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneratedeletebutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          onitemdeleted="StoresDetailView_ItemDeleted" 
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>


<%@ Page language="VB" AutoEventWireup="False" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">

  Sub StoresDetailView_ItemDeleted(ByVal sender As Object, _
    ByVal e As DetailsViewDeletedEventArgs) _
    Handles CustomerDetailsView.ItemDeleted
  
    ' Use the Exception property to determine whether an exception
    ' occurred during the delete operation.
    If e.Exception Is Nothing Then
    
      ' Use the AffectedRows property to determine the numbers of
      ' rows affected by the delete operation.
      If e.AffectedRows = 1 Then
      
        MessageLabel.Text = e.AffectedRows.ToString() _
          & " record deleted successfully."
      
      Else
              
        MessageLabel.Text = e.AffectedRows.ToString() _
          & " records deleted successfully."
      
      End If
    
    Else
    
      ' Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message
      
      ' Use the ExceptionHandled property to indicate that the 
      ' exception is already handled.
      e.ExceptionHandled = True
    
    End If
    
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>DetailsViewDeletedEventArgs Example</title>
</head>
<body>
    <form id="form1" runat="server">
        
      <h3>DetailsViewDeletedEventArgs Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogeneratedeletebutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <asp:label id="MessageLabel"
          forecolor="Red"
          runat="server"/>
            
        <!-- This example uses Microsoft SQL Server and connects  -->
        <!-- to the Northwind sample database. Use an ASP.NET     -->
        <!-- expression to retrieve the connection string value   -->
        <!-- from the web.config file.                            -->
        <asp:sqldatasource id="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          deletecommand="Delete [Customers] 
            Where [CustomerID]=@CustomerID"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

注解

如果在 Exception 删除操作过程中引发的任何) ,请使用属性来确定异常 (。Use the Exception property to determine the exception (if any) that was raised during the delete operation. 如果未引发异常,此属性将返回 nullIf no exceptions were raised, this property returns null.

备注

如果引发了异常,并且您决定在事件处理程序中处理异常,请确保将 ExceptionHandled 属性设置为 true ; 否则,异常将传递到调用堆栈上的下一方法以进行处理。If an exception was raised and you decide to handle the exception in the event handler, be sure to set the ExceptionHandled property to true; otherwise, the exception is passed to the next method on the call stack for handling.

适用于

另请参阅