GridViewDeletedEventHandler デリゲート
アセンブリ: System.Web (system.web.dll 内)

Public Delegate Sub GridViewDeletedEventHandler ( _ sender As Object, _ e As GridViewDeletedEventArgs _ )
/** @delegate */ public delegate void GridViewDeletedEventHandler ( Object sender, GridViewDeletedEventArgs e )

GridView コントロールは、コントロール内の Delete ボタン (CommandName プロパティが "Delete" に設定されたボタン) がクリックされた場合に、GridView コントロールが実際にレコードを削除した後に RowDeleted イベントを発生させます。これにより、このイベントが発生するたびにカスタム ルーチン (削除操作の結果を確認するなど) を実行するイベント処理メソッドを提供できます。
GridViewDeletedEventHandler デリゲートを作成する場合は、イベントを処理するメソッドを識別してください。イベントをイベント ハンドラに関連付けるには、デリゲートのインスタンスをイベントに追加します。デリゲートを削除しない限り、そのイベントが発生すると常にイベント ハンドラが呼び出されます。イベント ハンドラ デリゲートの詳細については、「イベントとデリゲート」を参照してください。

GridViewDeletedEventHandler デリゲートを、プログラムによって GridView コントロールの RowDeleted イベントに追加する方法を次の例に示します。
<%@ Page language="VB" %> <script runat="server"> Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) ' Create a new GridView control. Dim customersGridView As New GridView() ' Set the GridView control's properties. customersGridView.ID = "CustomersGridView" customersGridView.DataSourceID = "CustomersSqlDataSource" customersGridView.AutoGenerateColumns = True customersGridView.AutoGenerateDeleteButton = True Dim keyArray() As String = {"CustomerID"} customersGridView.DataKeyNames = keyArray ' Programmatically register the event-handling method ' for the RowDeleted event of the GridView control. AddHandler customersGridView.RowDeleted, AddressOf CustomersGridView_RowDeleted ' Add the GridView control to the Controls collection ' of the PlaceHolder control. GridViewPlaceHolder.Controls.Add(customersGridView) End Sub Sub CustomersGridView_RowDeleted(ByVal sender As Object, ByVal e As GridViewDeletedEventArgs) ' Display whether the delete operation succeeded. If e.Exception Is Nothing Then Message.Text = "Row deleted successfully." Else Message.Text = "An error occurred while attempting to deleting the row." e.ExceptionHandled = True End If End Sub </script> <html> <body> <form runat="server"> <h3>GridViewDeletedEventHandler Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <asp:placeholder id="GridViewPlaceHolder" 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]" deletecommand="Delete from Customers where CustomerID = @CustomerID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"> </asp:sqldatasource> </form> </body> </html>
<%@ Page language="C#" %> <script runat="server"> void Page_Load(Object sender, EventArgs e) { // Create a new GridView control. GridView customersGridView = new GridView(); // Set the GridView control's properties. customersGridView.ID = "CustomersGridView"; customersGridView.DataSourceID = "CustomersSqlDataSource"; customersGridView.AutoGenerateColumns = true; customersGridView.AutoGenerateDeleteButton = true; customersGridView.DataKeyNames = new String[1] { "CustomerID" }; // Programmatically register the event-handling method // for the RowDeleted event of the GridView control. customersGridView.RowDeleted += new GridViewDeletedEventHandler(this.CustomersGridView_RowDeleted); // Add the GridView control to the Controls collection // of the PlaceHolder control. GridViewPlaceHolder.Controls.Add(customersGridView); } void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e) { // Display whether the delete operation succeeded. if(e.Exception == null) { Message.Text = "Row deleted successfully."; } else { Message.Text = "An error occurred while attempting to deleting the row."; e.ExceptionHandled = true; } } </script> <html> <body> <form runat="server"> <h3>GridViewDeletedEventHandler Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <asp:placeholder id="GridViewPlaceHolder" 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]" deletecommand="Delete from Customers where CustomerID = @CustomerID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"> </asp:sqldatasource> </form> </body> </html>
GridViewDeletedEventHandler デリゲートを、宣言によって GridView コントロールの RowDeleted イベントに追加する方法を次の例に示します。
<%@ Page language="VB" %> <script runat="server"> Sub CustomersGridView_RowDeleted(sender As Object, e As GridViewDeletedEventArgs) ' Display whether the delete operation succeeded. If e.Exception Is Nothing Then Message.Text = "Row deleted successfully." Else Message.Text = "An error occurred while attempting to delete the row." e.ExceptionHandled = True End If End Sub </script> <html> <body> <form runat="server"> <h3>GridView RowDeleted Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <asp:gridview id="CustomersGridView" datasourceid="CustomersSqlDataSource" autogeneratecolumns="true" autogeneratedeletebutton="true" datakeynames="CustomerID" onrowdeleted="CustomersGridView_RowDeleted" runat="server"> </asp:gridview> <!-- 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]" deletecommand="Delete from Customers where CustomerID = @CustomerID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"> </asp:sqldatasource> </form> </body> </html>
<%@ Page language="C#" %> <script runat="server"> void CustomersGridView_RowDeleted(Object sender, GridViewDeletedEventArgs e) { // Display whether the delete operation succeeded. if(e.Exception == null) { Message.Text = "Row deleted successfully."; } else { Message.Text = "An error occurred while attempting to delete the row."; e.ExceptionHandled = true; } } </script> <html> <body> <form runat="server"> <h3>GridView RowDeleted Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <asp:gridview id="CustomersGridView" datasourceid="CustomersSqlDataSource" autogeneratecolumns="true" autogeneratedeletebutton="true" datakeynames="CustomerID" onrowdeleted="CustomersGridView_RowDeleted" runat="server"> </asp:gridview> <!-- 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]" deletecommand="Delete from Customers where CustomerID = @CustomerID" connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>" runat="server"> </asp:sqldatasource> </form> </body> </html>

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