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

更新操作中に発生した例外を表す Exception。

更新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、例外が呼び出し履歴の次のメソッドに渡されて処理が行われます。 |

Exception プロパティを使用して、更新操作中に例外が発生したかどうかを確認する方法のコード例を次に示します。
<%@ Page language="VB" %> <script runat="server"> Sub CustomerDetailsView_ItemUpdated(ByVal sender As Object, ByVal e As DetailsViewUpdatedEventArgs) ' Use the Exception property to determine whether an exception ' occurred during the insert operation. If e.Exception Is Nothing Then ' Use the Values property to get the value entered by ' the user for the CompanyName field. Dim keyFieldValue As String = e.Keys("CustomerID").ToString() ' Display a confirmation message. MessageLabel.Text = "Record " & keyFieldValue & _ " updated successfully. " ' Display the old and new values. DisplayValues(e) If e.AffectedRows = 1 Then MessageLabel.Text &= e.AffectedRows.ToString() & _ " record updated." Else MessageLabel.Text &= e.AffectedRows.ToString() & _ " records updated." 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 ' When an exception occurs, keep the DetailsView ' control in edit mode. e.KeepInEditMode = True End If End Sub Sub DisplayValues(ByVal e As DetailsViewUpdatedEventArgs) MessageLabel.Text &= "<br/></br>" ' Iterate through the OldValue and NewValues ' properties and display the values. Dim i As Integer For i = 0 To e.OldValues.Count - 1 MessageLabel.Text &= "Old Value=" & e.OldValues(i).ToString() & _ ", New Value=" & e.NewValues(i).ToString() & "<br/>" Next MessageLabel.Text &= "</br>" End Sub </script> <html> <body> <form runat="server"> <h3>DetailsViewUpdatedEventArgs Example</h3> <asp:detailsview id="CustomerDetailsView" datasourceid="DetailsViewSource" autogeneraterows="true" autogenerateeditbutton="true" allowpaging="true" datakeynames="CustomerID" onitemupdated="CustomerDetailsView_ItemUpdated" runat="server"> <pagersettings position="Bottom"/> </asp:detailsview> <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="DetailsViewSource" selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" updatecommand="Update [Customers] Set [CompanyName]=@CompanyName, [Address]=@Address, [City]=@City, [PostalCode]=@PostalCode, [Country]=@Country Where [CustomerID]=@CustomerID" connectionstring= "<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"/> </form> </body> </html>
<%@ Page language="C#" %> <script runat="server"> void CustomerDetailsView_ItemUpdated(Object sender, DetailsViewUpdatedEventArgs e) { // Use the Exception property to determine whether an exception // occurred during the insert operation. if (e.Exception == null) { // Use the Values property to get the value entered by // the user for the CompanyName field. String keyFieldValue = e.Keys["CustomerID"].ToString(); // Display a confirmation message. MessageLabel.Text = "Record " + keyFieldValue + " updated successfully. "; // Display the old and new values. DisplayValues(e); if (e.AffectedRows == 1) { MessageLabel.Text += e.AffectedRows.ToString() + " record updated."; } else { MessageLabel.Text += e.AffectedRows.ToString() + " records updated."; } } 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 edit mode. e.KeepInEditMode = true; } } void DisplayValues(DetailsViewUpdatedEventArgs e) { MessageLabel.Text += "<br/></br>"; // Iterate through the OldValue and NewValues // properties and display the values. for (int i = 0; i < e.OldValues.Count; i++) { MessageLabel.Text += "Old Value=" + e.OldValues[i].ToString() + ", New Value=" + e.NewValues[i].ToString() + "<br/>"; } MessageLabel.Text += "</br>"; } </script> <html> <body> <form runat="server"> <h3>DetailsViewUpdatedEventArgs Example</h3> <asp:detailsview id="CustomerDetailsView" datasourceid="DetailsViewSource" autogeneraterows="true" autogenerateeditbutton="true" allowpaging="true" datakeynames="CustomerID" onitemupdated="CustomerDetailsView_ItemUpdated" runat="server"> <pagersettings position="Bottom"/> </asp:detailsview> <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="DetailsViewSource" selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]" updatecommand="Update [Customers] Set [CompanyName]=@CompanyName, [Address]=@Address, [City]=@City, [PostalCode]=@PostalCode, [Country]=@Country Where [CustomerID]=@CustomerID" 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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