ObjectDataSourceView.OnDeleted(ObjectDataSourceStatusEventArgs) ObjectDataSourceView.OnDeleted(ObjectDataSourceStatusEventArgs) ObjectDataSourceView.OnDeleted(ObjectDataSourceStatusEventArgs) ObjectDataSourceView.OnDeleted(ObjectDataSourceStatusEventArgs) Method

定義

Deleted オブジェクトが削除操作を完了した後に、ObjectDataSourceView イベントを発生させます。Raises the Deleted event after the ObjectDataSourceView object has completed a delete operation.

protected:
 virtual void OnDeleted(System::Web::UI::WebControls::ObjectDataSourceStatusEventArgs ^ e);
protected virtual void OnDeleted (System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs e);
abstract member OnDeleted : System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs -> unit
override this.OnDeleted : System.Web.UI.WebControls.ObjectDataSourceStatusEventArgs -> unit
Protected Overridable Sub OnDeleted (e As ObjectDataSourceStatusEventArgs)

パラメーター

ビジネスオブジェクトObjectDataSource GridViewとコントロールを使用してデータを削除する方法を次のコード例に示します。The following code example demonstrates how to use an ObjectDataSource control with a business object and a GridView control to delete data. GridViewは、 EmployeeLogicオブジェクトからデータを取得するために、 SelectMethodプロパティによって指定されたメソッドを使用して、すべての従業員のセットが最初に表示されます。The GridView initially displays a set of all employees, using the method that is specified by the SelectMethod property to retrieve the data from the EmployeeLogic object. プロパティがAutoGenerateDeleteButtontrue設定されているGridViewため、コントロールには自動的に [削除] ボタンが表示されます。Because the AutoGenerateDeleteButton property is set to true, the GridView control automatically displays a Delete button.

[削除] ボタンDeleteをクリックすると、 DeleteMethodプロパティによって指定されたメソッドと、 DeleteParametersコレクションで指定されているすべてのパラメーターを使用して、操作が実行されます。If you click the Delete button, the Delete operation is performed using the method that is specified by the DeleteMethod property and any parameters that are specified in the DeleteParameters collection. このコード例では、一部の前処理と後処理の手順も実行します。In this code example, some preprocessing and post-processing steps are also performed. Delete Deleted Deleting Deleteデリゲートは、操作が実行NorthwindEmployeeDeletedされる前にイベントを処理するために呼び出され、操作の完了後にイベントを処理するためにデリゲートが呼び出されます。 NorthwindEmployeeDeleting例外処理を実行します。The NorthwindEmployeeDeleting delegate is called to handle the Deleting event before the Delete operation is performed, and the NorthwindEmployeeDeleted delegate is called to handle the Deleted event after the Delete operation has completed, to perform an exception handling. この例では、 NorthwindDataExceptionがスローされた場合、このデリゲートによって処理されます。In this example, if a NorthwindDataException is thrown, it is handled by this delegate.

このコード例で使用するEmployeeLogic中間層ビジネスオブジェクトの実装を確認するには、 ObjectDataSourceStatusEventArgs「」を参照してください。To examine the implementation of the EmployeeLogic middle-tier business object that this code example uses, see ObjectDataSourceStatusEventArgs.

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS" Assembly="Samples.AspNet.CS" %>
<%@ Import namespace="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
private void NorthwindEmployeeDeleting(object source, ObjectDataSourceMethodEventArgs e)
{
  // The GridView passes the ID of the employee
  // to be deleted. However, the buisiness object, EmployeeLogic,
  // requires a NorthwindEmployee parameter, named "ne". Create
  // it now and add it to the parameters collection.
  IDictionary paramsFromPage = e.InputParameters;
  if (paramsFromPage["EmpID"] != null) {
    NorthwindEmployee ne
      = new NorthwindEmployee( Int32.Parse(paramsFromPage["EmpID"].ToString()));
    // Remove the old EmpID parameter.
    paramsFromPage.Clear();
    paramsFromPage.Add("ne", ne);
  }
}

private void NorthwindEmployeeDeleted(object source, ObjectDataSourceStatusEventArgs e)
{
  // Handle the Exception if it is a NorthwindDataException
  if (e.Exception != null)
  {

    // Handle the specific exception type. The ObjectDataSource wraps
    // any Exceptions in a TargetInvokationException wrapper, so
    // check the InnerException property for expected Exception types.
    if (e.Exception.InnerException is NorthwindDataException)
    {
      Label1.Text = e.Exception.InnerException.Message;
      // Because the exception is handled, there is
      // no reason to throw it.
      e.ExceptionHandled = true;
    }
  }
}

</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ObjectDataSource - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <asp:gridview
          id="GridView1"
          runat="server"
          datasourceid="ObjectDataSource1"
          autogeneratedeletebutton="true"
          autogeneratecolumns="false"
          datakeynames="EmpID">
          <columns>
            <asp:boundfield headertext="EmpID" datafield="EmpID" />
            <asp:boundfield headertext="First Name" datafield="FirstName" />
            <asp:boundfield headertext="Last Name" datafield="LastName" />
          </columns>
        </asp:gridview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetAllEmployees"
          deletemethod="DeleteEmployee"
          ondeleting="NorthwindEmployeeDeleting"
          ondeleted="NorthwindEmployeeDeleted"
          typename="Samples.AspNet.CS.EmployeeLogic">
          <deleteparameters>
            <asp:parameter name="EmpID" type="Int32" />
          </deleteparameters>
        </asp:objectdatasource>

        <asp:label id="Label1" runat="server" />

    </form>
  </body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB" Assembly="Samples.AspNet.VB" %>
<%@ Import namespace="Samples.AspNet.VB" %>
<%@ Page language="vb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
' Called before a Delete operation.
    Private Sub NorthwindEmployeeDeleting(ByVal source As Object, ByVal e As ObjectDataSourceMethodEventArgs)

        ' The GridView passes the ID of the employee
        ' to be deleted. However, the business object, EmployeeLogic,
        ' requires a NorthwindEmployee parameter, named "ne". Create
        ' it now and add it to the parameters collection.
        Dim paramsFromPage As IDictionary = e.InputParameters
  
        If Not paramsFromPage("EmpID") Is Nothing Then
    
            Dim ne As New NorthwindEmployee(paramsFromPage("EmpID").ToString())
            ' Remove the old EmpID parameter.
            paramsFromPage.Clear()
            paramsFromPage.Add("ne", ne)
    
    
        End If
    End Sub ' NorthwindEmployeeDeleting

    ' Called after a Delete operation.
    Private Sub NorthwindEmployeeDeleted(ByVal source As Object, ByVal e As ObjectDataSourceStatusEventArgs)
        ' Handle the Exception if it is a NorthwindDataException.
        If Not e.Exception Is Nothing Then

            ' Handle the specific exception type. The ObjectDataSource wraps
            ' any Exceptions in a TargetInvokationException wrapper, so
            ' check the InnerException property for the expected Exception types.
            If e.Exception.InnerException.GetType().Equals(GetType(NorthwindDataException)) Then

                Label1.Text = e.Exception.InnerException.Message
                ' Because the exception is handled, there is
                ' no reason to throw it.
                e.ExceptionHandled = True
      
            End If
        End If
    End Sub ' NorthwindEmployeeDeleted
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>ObjectDataSource - VB Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <asp:gridview
          id="GridView1"
          runat="server"
          datasourceid="ObjectDataSource1"
          autogeneratedeletebutton="true"
          autogeneratecolumns="false"
          datakeynames="EmpID">
          <columns>
            <asp:boundfield headertext="EmpID" datafield="EmpID" />
            <asp:boundfield headertext="First Name" datafield="FirstName" />
            <asp:boundfield headertext="Last Name" datafield="LastName" />
          </columns>
        </asp:gridview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetAllEmployees"
          deletemethod="DeleteEmployee"
          ondeleting="NorthwindEmployeeDeleting"
          ondeleted="NorthwindEmployeeDeleted"
          typename="Samples.AspNet.VB.EmployeeLogic">
          <deleteparameters>
            <asp:parameter name="EmpID" type="Int32" />
          </deleteparameters>
        </asp:objectdatasource>

        <asp:label id="Label1" runat="server" />

    </form>
  </body>
</html>

注釈

イベントを発生させると、イベント ハンドラーがデリゲートから呼び出されます。Raising an event invokes the event handler through a delegate. イベントを処理する方法の詳細については、次を参照してください。処理とイベントの発生します。For more information about how to handle events, see Handling and Raising Events.

OnDeleted メソッドを使用すると、デリゲートを結び付けずに、派生クラスでイベントを処理することもできます。The OnDeleted method also allows derived classes to handle the event without attaching a delegate. 派生クラスでイベントを処理する場合は、この手法をお勧めします。This is the preferred technique for handling the event in a derived class.

注意 (継承者)

派生クラスOnDeleted(ObjectDataSourceStatusEventArgs)でをオーバーライドする場合は、登録されてOnDeleted(ObjectDataSourceStatusEventArgs)いるデリゲートがイベントを受け取るように、基本クラスのメソッドを呼び出す必要があります。When overriding the OnDeleted(ObjectDataSourceStatusEventArgs) in a derived class, be sure to call the OnDeleted(ObjectDataSourceStatusEventArgs) method for the base class so that registered delegates receive the event.

適用対象

こちらもご覧ください