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

Dim instance As GridViewUpdatedEventArgs Dim value As Boolean value = instance.ExceptionHandled instance.ExceptionHandled = value
/** @property */ public boolean get_ExceptionHandled () /** @property */ public void set_ExceptionHandled (boolean value)
public function get ExceptionHandled () : boolean public function set ExceptionHandled (value : boolean)
イベント ハンドラで例外が処理された場合は true。それ以外の場合は false。既定値は false です。

更新操作中に例外が発生する場合、ExceptionHandled プロパティを使用して、イベント ハンドラで例外が処理されたかどうかを示します。このプロパティが true に設定されている場合、例外は処理されたと見なされ、GridView コントロールによって再度スローされません。このプロパティが false に設定されている場合、例外が再度スローされます。どの例外が発生したかを確認するには、Exception プロパティを使用します。

ExceptionHandled プロパティを使用して例外がイベント ハンドラで処理されたことを示す方法の例を次に示します。
<%@ Page language="VB" %> <script runat="server"> Sub CustomersGridView_RowUpdated(sender As Object, e As GridViewUpdatedEventArgs) ' Use the Exception property to determine whether an exception ' occurred during the update operation. If e.Exception Is Nothing Then ' Sometimes an error might occur that does not raise an ' exception, but prevents the update operation from ' completing. Use the AffectedRows property to determine ' whether the record was actually updated. If e.AffectedRows = 1 Then ' Use the Keys property to get the value of the key field. Dim keyFieldValue As String = e.Keys("CustomerID").ToString() ' Display a confirmation message. Message.Text = "Record " & keyFieldValue & _ " updated successfully. " ' Display the new and original values. DisplayValues(CType(e.NewValues, OrderedDictionary), CType(e.OldValues, OrderedDictionary)) Else ' Display an error message. Message.Text = "An error occurred during the update operation." ' When an error occurs, keep the GridView ' control in edit mode. e.KeepInEditMode = True End If Else ' Insert the code to handle the exception. Message.Text = e.Exception.Message ' Use the ExceptionHandled property to indicate that the ' exception is already handled. e.ExceptionHandled = True e.KeepInEditMode = True End If End Sub Sub DisplayValues(ByVal newValues As OrderedDictionary, ByVal oldValues As OrderedDictionary) Message.Text &= "<br/></br>" ' Iterate through the new and old values. Display the ' values on the page. Dim i As Integer For i = 0 To oldValues.Count - 1 Message.Text &= "Old Value=" & oldValues(i).ToString() & _ ", New Value=" & newValues(i).ToString() & "<br/>" Next Message.Text &= "</br>" End Sub </script> <html> <body> <form runat="server"> <h3>GridViewUpdatedEventArgs Example</h3> <!-- The GridView control automatically sets the columns --> <!-- specified in the datakeynames property as read-only. --> <!-- No input controls are rendered for these columns in --> <!-- edit mode. --> <asp:gridview id="CustomersGridView" datasourceid="CustomersSqlDataSource" autogeneratecolumns="true" autogenerateeditbutton="true" allowpaging="true" datakeynames="CustomerID" onrowupdated="CustomersGridView_RowUpdated" runat="server"> </asp:gridview> <br/> <asp:label id="Message" 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="CustomersSqlDataSource" 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"> </asp:sqldatasource> </form> </body> </html>
<%@ Page language="C#" %> <script runat="server"> void CustomersGridView_RowUpdated(Object sender, GridViewUpdatedEventArgs e) { // Use the Exception property to determine whether an exception // occurred during the update operation. if (e.Exception == null) { // Sometimes an error might occur that does not raise an // exception, but prevents the update operation from // completing. Use the AffectedRows property to determine // whether the record was actually updated. if (e.AffectedRows == 1) { // Use the Keys property to get the value of the key field. String keyFieldValue = e.Keys["CustomerID"].ToString(); // Display a confirmation message. Message.Text = "Record " + keyFieldValue + " updated successfully. "; // Display the new and original values. DisplayValues((OrderedDictionary)e.NewValues, (OrderedDictionary)e.OldValues); } else { // Display an error message. Message.Text = "An error occurred during the update operation."; // When an error occurs, keep the GridView // control in edit mode. e.KeepInEditMode = true; } } else { // Insert the code to handle the exception. Message.Text = e.Exception.Message; // Use the ExceptionHandled property to indicate that the // exception is already handled. e.ExceptionHandled = true; e.KeepInEditMode = true; } } void DisplayValues(OrderedDictionary newValues, OrderedDictionary oldValues) { Message.Text += "<br/></br>"; // Iterate through the new and old values. Display the // values on the page. for (int i = 0; i < oldValues.Count; i++) { Message.Text += "Old Value=" + oldValues[i].ToString() + ", New Value=" + newValues[i].ToString() + "<br/>"; } Message.Text += "</br>"; } </script> <html> <body> <form runat="server"> <h3>GridViewUpdatedEventArgs Example</h3> <!-- The GridView control automatically sets the columns --> <!-- specified in the datakeynames property as read-only. --> <!-- No input controls are rendered for these columns in --> <!-- edit mode. --> <asp:gridview id="CustomersGridView" datasourceid="CustomersSqlDataSource" autogeneratecolumns="true" autogenerateeditbutton="true" allowpaging="true" datakeynames="CustomerID" onrowupdated="CustomersGridView_RowUpdated" runat="server"> </asp:gridview> <br/> <asp:label id="Message" 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="CustomersSqlDataSource" 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"> </asp:sqldatasource> </form> </body> </html>

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