DetailsViewInsertedEventArgs.ExceptionHandled 属性
定义
获取或设置一个值,该值指示在插入操作过程中所引发的异常是否已在事件处理程序中得到处理。Gets or sets a value indicating whether an exception that was raised during the insert operation was handled in the event handler.
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
属性值
如果异常已在事件处理程序中得到处理,则为 true;否则为 false。true if the exception was handled in the event handler; otherwise, false. 默认值为 false。The default is false.
示例
下面的代码示例演示如何使用 ExceptionHandled 属性指示在事件处理程序中已处理异常。The following code example demonstrates how to use the ExceptionHandled property to indicate that the exception was handled in the event handler.
<%@ 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 CustomerDetailsView_ItemInserted(Object sender,
DetailsViewInsertedEventArgs e)
{
// Use the Exception property to determine whether an exception
// occurred during the insert operation.
if (e.Exception == null && e.AffectedRows == 1)
{
// Use the Values property to get the value entered by
// the user for the CompanyName field.
String name = e.Values["CompanyName"].ToString();
// Display a confirmation message.
MessageLabel.Text = name + " added 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;
// When an exception occurs, keep the DetailsView
// control in insert mode.
e.KeepInInsertMode = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewInsertedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewInsertedEventArgs Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
datakeynames="CustomerID"
autogenerateinsertbutton="true"
autogeneraterows="true"
allowpaging="true"
oniteminserted="CustomerDetailsView_ItemInserted"
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]"
insertcommand="INSERT INTO [Customers]([CustomerID],
[CompanyName], [Address], [City], [PostalCode],
[Country]) VALUES (@CustomerID, @CompanyName, @Address,
@City, @PostalCode, @Country)"
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 CustomerDetailsView_ItemInserted(ByVal sender As Object, _
ByVal e As DetailsViewInsertedEventArgs) _
Handles CustomerDetailsView.ItemInserted
' Use the Exception property to determine whether an exception
' occurred during the insert operation.
If e.Exception Is Nothing And e.AffectedRows = 1 Then
' Use the Values property to get the value entered by
' the user for the CompanyName field.
Dim name As String = e.Values("CompanyName").ToString()
' Display a confirmation message.
MessageLabel.Text = name & " added 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
' When an exception occurs, keep the DetailsView
' control in insert mode.
e.KeepInInsertMode = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewInsertedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewInsertedEventArgs Example</h3>
<asp:detailsview id="CustomerDetailsView"
datasourceid="DetailsViewSource"
datakeynames="CustomerID"
autogenerateinsertbutton="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]"
insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName],
[Address], [City], [PostalCode], [Country])
VALUES (@CustomerID, @CompanyName, @Address, @City,
@PostalCode, @Country)"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
注解
在插入操作过程中引发异常时,请使用 ExceptionHandled 属性指示是否已在事件处理程序中处理异常。When an exception is raised during the insert operation, use the ExceptionHandled property to indicate whether the exception was handled in the event handler. 如果将此属性设置为 true ,则异常将被视为已处理,并且不会在调用堆栈中进一步传递。When this property is set to true, the exception is considered handled and is not passed further up the call stack. 如果将此属性设置为 false ,则异常将传递到调用堆栈上的下一个方法进行处理。If this property is set to false, the exception is passed to the next method on the call stack for handling. 若要确定引发的异常,请使用 Exception 属性。To determine which exception was raised, use the Exception property.