FormViewInsertedEventArgs.ExceptionHandled 属性
定义
重要
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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。
public:
property bool ExceptionHandled { bool get(); void set(bool value); };public bool ExceptionHandled { get; set; }member this.ExceptionHandled : bool with get, setPublic 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。 默认值为 false。
示例
以下示例演示如何使用 ExceptionHandled 属性指示在事件处理程序中处理异常。
<%@ 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 EmployeeFormView_ItemInserted(Object sender, FormViewInsertedEventArgs e)
{
// Use the Exception property to determine whether an exception
// occurred during the insert operation.
if (e.Exception == null)
{
// Use the AffectedRows property to determine whether the
// record was inserted. Sometimes an error might occur that
// does not raise an exception, but prevents the insert
// operation from completing.
if (e.AffectedRows == 1)
{
MessageLabel.Text = "Record inserted successfully.";
}
else
{
MessageLabel.Text = "An error occurred during the insert operation.";
// Use the KeepInInsertMode property to remain in insert mode
// when an error occurs during the insert operation.
e.KeepInInsertMode = true;
}
}
else
{
// Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message;
// Use the ExceptionHandled property to indicate that the
// exception has already been handled.
e.ExceptionHandled = true;
e.KeepInInsertMode = true;
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormViewInsertedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormViewInsertedEventArgs Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
emptydatatext="No employees found."
oniteminserted="EmployeeFormView_ItemInserted"
runat="server">
<itemtemplate>
<table>
<tr>
<td rowspan="5">
<asp:image id="CompanyLogoImage"
imageurl="~/Images/Logo.jpg"
alternatetext="Company logo"
runat="server"/>
</td>
<td colspan="2">
</td>
</tr>
<tr>
<td>
<b>Name:</b>
</td>
<td>
<%# Eval("FirstName") %> <%# Eval("LastName") %>
</td>
</tr>
<tr>
<td>
<b>Title:</b>
</td>
<td>
<%# Eval("Title") %>
</td>
</tr>
<tr>
<td colspan="2">
<asp:linkbutton id="NewButton"
text="New"
commandname="New"
runat="server"/>
</td>
</tr>
</table>
</itemtemplate>
<insertitemtemplate>
<table>
<tr>
<td rowspan="4">
<asp:image id="CompanyLogoEditImage"
imageurl="~/Images/Logo.jpg"
alternatetext="Company logo"
runat="server"/>
</td>
<td colspan="2">
</td>
</tr>
<tr>
<td>
<b><asp:Label
runat="server"
AssociatedControlID="FirstNameInsertTextBox"
Text="Name" />:</b>
</td>
<td>
<asp:textbox id="FirstNameInsertTextBox"
text='<%# Bind("FirstName") %>'
runat="server"/>
<asp:textbox id="LastNameInsertTextBox"
text='<%# Bind("LastName") %>'
runat="server"/>
</td>
</tr>
<tr>
<td>
<b><asp:Label
runat="server"
AssociatedControlID="TitleInsertTextBox"
Text="Title" />:</b>
</td>
<td>
<asp:textbox id="TitleInsertTextBox"
text='<%# Bind("Title") %>'
runat="server"/>
</td>
</tr>
<tr>
<td colspan="2">
<asp:linkbutton id="InsertButton"
text="Insert"
commandname="Insert"
runat="server"/>
<asp:linkbutton id="CancelButton"
text="Cancel"
commandname="Cancel"
runat="server"/>
</td>
</tr>
</table>
</insertitemtemplate>
</asp:formview>
<br/><br/>
<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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
insertcommand="Insert Into [Employees] ([LastName], [FirstName], [Title]) VALUES (@LastName, @FirstName, @Title)"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</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 EmployeeFormView_ItemInserted(ByVal sender As Object, ByVal e As FormViewInsertedEventArgs)
' Use the Exception property to determine whether an exception
' occurred during the insert operation.
If e.Exception Is Nothing Then
' Use the AffectedRows property to determine whether the
' record was inserted. Sometimes an error might occur that
' does not raise an exception, but prevents the insert
' operation from completing.
If e.AffectedRows = 1 Then
MessageLabel.Text = "Record inserted successfully."
Else
MessageLabel.Text = "An error occurred during the insert operation."
' Use the KeepInInsertMode property to remain in insert mode
' when an error occurs during the insert operation.
e.KeepInInsertMode = True
End If
Else
' Insert the code to handle the exception.
MessageLabel.Text = e.Exception.Message
' Use the ExceptionHandled property to indicate that the
' exception has already been handled.
e.ExceptionHandled = True
e.KeepInInsertMode = True
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>FormViewInsertedEventArgs Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>FormViewInsertedEventArgs Example</h3>
<asp:formview id="EmployeeFormView"
datasourceid="EmployeeSource"
allowpaging="true"
datakeynames="EmployeeID"
emptydatatext="No employees found."
oniteminserted="EmployeeFormView_ItemInserted"
runat="server">
<itemtemplate>
<table>
<tr>
<td rowspan="5">
<asp:image id="CompanyLogoImage"
imageurl="~/Images/Logo.jpg"
alternatetext="Company logo"
runat="server"/>
</td>
<td colspan="2">
</td>
</tr>
<tr>
<td>
<b>Name:</b>
</td>
<td>
<%# Eval("FirstName") %> <%# Eval("LastName") %>
</td>
</tr>
<tr>
<td>
<b>Title:</b>
</td>
<td>
<%# Eval("Title") %>
</td>
</tr>
<tr>
<td colspan="2">
<asp:linkbutton id="NewButton"
text="New"
commandname="New"
runat="server"/>
</td>
</tr>
</table>
</itemtemplate>
<insertitemtemplate>
<table>
<tr>
<td rowspan="4">
<asp:image id="CompanyLogoEditImage"
imageurl="~/Images/Logo.jpg"
alternatetext="Company logo"
runat="server"/>
</td>
<td colspan="2">
</td>
</tr>
<tr>
<td>
<b><asp:Label
runat="server"
AssociatedControlID="FirstNameInsertTextBox"
Text="Name" />:</b>
</td>
<td>
<asp:textbox id="FirstNameInsertTextBox"
text='<%# Bind("FirstName") %>'
runat="server"/>
<asp:textbox id="LastNameInsertTextBox"
text='<%# Bind("LastName") %>'
runat="server"/>
</td>
</tr>
<tr>
<td>
<b><asp:Label
runat="server"
AssociatedControlID="TitleInsertTextBox"
Text="Title" />:</b>
</td>
<td>
<asp:textbox id="TitleInsertTextBox"
text='<%# Bind("Title") %>'
runat="server"/>
</td>
</tr>
<tr>
<td colspan="2">
<asp:linkbutton id="InsertButton"
text="Insert"
commandname="Insert"
runat="server"/>
<asp:linkbutton id="CancelButton"
text="Cancel"
commandname="Cancel"
runat="server"/>
</td>
</tr>
</table>
</insertitemtemplate>
</asp:formview>
<br/><br/>
<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="EmployeeSource"
selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title], [PhotoPath] From [Employees]"
insertcommand="Insert Into [Employees] ([LastName], [FirstName], [Title]) VALUES (@LastName, @FirstName, @Title)"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
注解
在插入操作期间引发异常时，请使用该 ExceptionHandled 属性指示是否在事件处理程序中处理异常。 当此属性设置为 true时，该异常被视为已处理且不会重新引发。 如果此属性设置为 false，控件 FormView 将重新引发异常。 若要确定引发的异常，请使用该 Exception 属性。