FormViewDeletedEventArgs.Exception プロパティ
アセンブリ: System.Web (system.web.dll 内)

削除操作中に発生した例外を表す Exception。

削除操作中に例外が発生した場合は、Exception プロパティを使用して例外を確認します。例外が発生しなかった場合、このプロパティは null 参照 (Visual Basic では Nothing) を返します。
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例外が発生し、その例外をイベント ハンドラで処理する場合は、ExceptionHandled プロパティを true に設定してください。そうしないと、FormView コントロールから例外が再度スローされます。 |

Exception プロパティを使用して、削除操作中に例外が発生したかどうかを確認する方法の例を次に示します。
<%@ Page language="VB" %> <script runat="server"> Sub EmployeeFormView_ItemDeleted(ByVal sender As Object, ByVal e As FormViewDeletedEventArgs) Handles EmployeeFormView.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 whether the ' record was deleted. Sometimes an error might occur that ' does not raise an exception, but prevents the delete ' operation from completing. If e.AffectedRows = 1 Then MessageLabel.Text = "Record deleted successfully." Else MessageLabel.Text = "An error occurred during the delete operation." 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 End If End Sub </script> <html> <body> <form runat="server"> <h3>FormViewDeletedEventArgs Example</h3> <asp:formview id="EmployeeFormView" datasourceid="EmployeeSource" allowpaging="true" datakeynames="EmployeeID" runat="server"> <itemtemplate> <table> <tr> <td> <asp:image id="EmployeeImage" imageurl='<%# Eval("PhotoPath") %>' alternatetext='<%# Eval("LastName") %>' runat="server"/> </td> <td> <h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3> <%# Eval("Title") %> </td> </tr> <tr> <td colspan="2"> <asp:button id="DeleteButton" text="Delete Record" commandname="Delete" runat="server" /> </td> </tr> </table> </itemtemplate> </asp:formview> <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]" deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"/> </form> </body> </html>
<%@ Page language="C#" %> <script runat="server"> void EmployeeFormView_ItemDeleted(Object sender, FormViewDeletedEventArgs 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 whether the // record was deleted. Sometimes an error might occur that // does not raise an exception, but prevents the delete // operation from completing. if (e.AffectedRows == 1) { MessageLabel.Text = "Record deleted successfully."; } else { MessageLabel.Text = "An error occurred during the delete operation."; } } 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; } } </script> <html> <body> <form runat="server"> <h3>FormViewDeletedEventArgs Example</h3> <asp:formview id="EmployeeFormView" datasourceid="EmployeeSource" allowpaging="true" datakeynames="EmployeeID" onitemdeleted="EmployeeFormView_ItemDeleted" runat="server"> <itemtemplate> <table> <tr> <td> <asp:image id="EmployeeImage" imageurl='<%# Eval("PhotoPath") %>' alternatetext='<%# Eval("LastName") %>' runat="server"/> </td> <td> <h3><%# Eval("FirstName") %> <%# Eval("LastName") %></h3> <%# Eval("Title") %> </td> </tr> <tr> <td colspan="2"> <asp:button id="DeleteButton" text="Delete Record" commandname="Delete" runat="server" /> </td> </tr> </table> </itemtemplate> </asp:formview> <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]" deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"/> </form> </body> </html>

Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
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