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

Public Delegate Sub GridViewCancelEditEventHandler ( _ sender As Object, _ e As GridViewCancelEditEventArgs _ )
public delegate void GridViewCancelEditEventHandler ( Object sender, GridViewCancelEditEventArgs e )
public delegate void GridViewCancelEditEventHandler ( Object^ sender, GridViewCancelEditEventArgs^ e )
/** @delegate */ public delegate void GridViewCancelEditEventHandler ( Object sender, GridViewCancelEditEventArgs e )

RowCancelingEdit イベントは、編集モードで行の Cancel ボタンがクリックされた場合に、行が編集モードを終了する前に発生します。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 (行が好ましくない状態になった場合にキャンセル操作を停止するなど) を実行するイベント処理メソッドを提供できます。
GridViewCancelEditEventHandler 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。

GridViewCancelEditEventHandler デリゲートを、プログラムによって GridView コントロールの RowCancelingEdit 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 object. Dim customerGridView As New GridView() ' Set the GridView object's properties. customerGridView.ID = "CustomersGridView" customerGridView.DataSourceID = "CustomersSqlDataSource" customerGridView.AutoGenerateColumns = True customerGridView.AutoGenerateEditButton = True customerGridView.DataKeyNames = New [String]() {"CustomerID"} ' Programmatically register the event-handling methods. AddHandler customerGridView.RowCancelingEdit, AddressOf CustomersGridView_RowCancelingEdit AddHandler customerGridView.RowUpdated, AddressOf CustomersGridView_RowUpdated ' Add the GridView object to the Controls collection ' of the PlaceHolder control. GridViewPlaceHolder.Controls.Add(customerGridView) End Sub Sub CustomersGridView_RowCancelingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs) ' Display a message indicating that the update operation was canceled. Message.Text = "Update for row " + e.RowIndex.ToString() + " canceled." End Sub Sub CustomersGridView_RowUpdated(ByVal sender As Object, ByVal e As GridViewUpdatedEventArgs) ' The update operation was successful. Clear the message label. Message.Text = "" End Sub </script> <html> <body> <form runat="server"> <h3>GridViewCancelEditEventHandler 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]" 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 Page_Load(Object sender, EventArgs e) { // Create a new GridView object. GridView customerGridView = new GridView(); // Set the GridView object's properties. customerGridView.ID = "CustomersGridView"; customerGridView.DataSourceID = "CustomersSqlDataSource"; customerGridView.AutoGenerateColumns = true; customerGridView.AutoGenerateEditButton = true; customerGridView.DataKeyNames = new String[] { "CustomerID" }; // Programmatically register the event-handling methods. customerGridView.RowCancelingEdit += new GridViewCancelEditEventHandler(this.CustomersGridView_RowCancelingEdit); customerGridView.RowUpdated += new GridViewUpdatedEventHandler(this.CustomersGridView_RowUpdated); // Add the GridView object to the Controls collection // of the PlaceHolder control. GridViewPlaceHolder.Controls.Add(customerGridView); } void CustomersGridView_RowCancelingEdit(Object sender, GridViewCancelEditEventArgs e) { // Display a message indicating that the update operation was canceled. Message.Text = "Update for row " + e.RowIndex.ToString() + " canceled."; } void CustomersGridView_RowUpdated(Object sender, GridViewUpdatedEventArgs e) { // The update operation was successful. Clear the message label. Message.Text = ""; } </script> <html> <body> <form runat="server"> <h3>GridViewCancelEditEventHandler 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]" 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>
GridViewCancelEditEventHandler デリゲートを、宣言によって GridView コントロールの RowCancelingEdit 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_RowCancelingEdit(ByVal sender As Object, ByVal e As GridViewCancelEditEventArgs) ' Retrieve the row that raised the event from the Rows ' collection of the GridView control. Dim row As GridViewRow = CustomersGridView.Rows(e.RowIndex) ' The update operation was canceled. Display the ' primary key of the row. In this example, the primary ' key is displayed in the second column of the GridView ' control. To access the text of the column, use the Cells ' collection of the row. Message.Text = "Update for item " & row.Cells(1).Text & " Canceled." End Sub Sub CustomersGridView_RowEditing(ByVal sender As Object, ByVal e As GridViewEditEventArgs) ' The GridView control is entering edit mode. Clear the message label. Message.Text = "" End Sub Sub CustomersGridView_RowUpdated(ByVal sender As Object, ByVal e As GridViewUpdatedEventArgs) ' The update operation was successful. Clear the message label. Message.Text = "" End Sub </script> <html> <body> <form runat="server"> <h3>GridView RowCancelingEdit Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <!-- The GridView control automatically sets the columns --> <!-- specified in the datakeynames attribute 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" onrowcancelingedit="CustomersGridView_RowCancelingEdit" onrowediting="CustomersGridView_RowEditing" onrowupdated="CustomersGridView_RowUpdated" 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]" 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_RowCancelingEdit(Object sender, GridViewCancelEditEventArgs e) { // Retrieve the row that raised the event from the Rows // collection of the GridView control. GridViewRow row = CustomersGridView.Rows[e.RowIndex]; // The update operation was canceled. Display the // primary key of the row. In this example, the primary // key is displayed in the second column of the GridView // control. To access the text of the column, use the Cells // collection of the row. Message.Text = "Update for item " + row.Cells[1].Text + " Canceled."; } void CustomersGridView_RowEditing(Object sender, GridViewEditEventArgs e) { // The GridView control is entering edit mode. Clear the message label. Message.Text = ""; } void CustomersGridView_RowUpdated(Object sender, GridViewUpdatedEventArgs e) { // The update operation was successful. Clear the message label. Message.Text = ""; } </script> <html> <body> <form runat="server"> <h3>GridView RowCancelingEdit Example</h3> <asp:label id="Message" forecolor="Red" runat="server"/> <br/> <!-- The GridView control automatically sets the columns --> <!-- specified in the datakeynames attribute 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" onrowcancelingedit="CustomersGridView_RowCancelingEdit" onrowediting="CustomersGridView_RowEditing" onrowupdated="CustomersGridView_RowUpdated" 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]" 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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