ObjectDataSourceMethodEventHandler デリゲートとは何？わかりやすく解説 Weblio辞書

.NET Framework クラスライブラリリファレンス

索引トップ用語の索引ランキング

ObjectDataSourceMethodEventHandler デリゲート

メモ : このデリゲートは、.NET Framework version 2.0 で新しく追加されたものです。

ObjectDataSource コントロールの Selecting、Updating、Inserting、Deleting の各イベントを処理するメソッドを表します。

名前空間: System.Web.UI.WebControls
アセンブリ: System.Web (system.web.dll 内)
構文

Visual Basic (宣言)

Public Delegate Sub ObjectDataSourceMethodEventHandler
 ( _
    sender As Object, _
    e As ObjectDataSourceMethodEventArgs _
)

Visual Basic (使用法)

Dim instance As New ObjectDataSourceMethodEventHandler(AddressOf
 HandlerMethod)

public delegate void ObjectDataSourceMethodEventHandler
 (
    Object sender,
    ObjectDataSourceMethodEventArgs e
)

C++

public delegate void ObjectDataSourceMethodEventHandler
 (
    Object^ sender, 
    ObjectDataSourceMethodEventArgs^ e
)

/** @delegate */
public delegate void ObjectDataSourceMethodEventHandler
 (
    Object sender, 
    ObjectDataSourceMethodEventArgs e
)

JScript

JScript では、デリゲートは使用できますが、新規に宣言することはできません。

パラメータ

sender: イベントのソースである ObjectDataSource。

e: イベントデータを格納している ObjectDataSourceMethodEventArgs。

解説

ObjectDataSource コントロールの Selecting、Updating、Inserting、または Deleting の各イベントでは、ObjectDataSource コントロールで呼び出すメソッドの決定に使用するパラメータを操作できます。詳細については、「ObjectDataSourceMethodEventArgs」を参照してください。

ObjectDataSourceMethodEventHandler 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、「イベントの利用」を参照してください。

使用例

このセクションには、2 つのコード例が含まれています。最初のコード例は、ビジネスオブジェクトおよび DetailsView コントロールで、ObjectDataSource コントロールを使用してデータを挿入する方法を示します。2 番目のコード例は、最初のコード例で使用される中間層ビジネスオブジェクトの例を示します。

ビジネスオブジェクトおよび DetailsView コントロールで、ObjectDataSource コントロールを使用してデータを挿入するコード例を次に示します。まず、DetailsView は、新しい NorthwindEmployee レコードと自動生成された [挿入] ボタンを表示します。DetailsView コントロールのフィールドにデータを入力した後に [挿入] ボタンをクリックすると、InsertMethod プロパティが Insert アクションを実行するメソッドを識別します。

この例では、UpdateEmployeeInfo メソッドを使用して挿入を実行します。ただし、データを挿入するには NorthwindEmployee パラメータが必要です。そのため、DetailsView コントロールが自動的に渡す文字列のコレクションでは不十分です。NorthwindEmployeeInserting デリゲートは Inserting イベントを処理する ObjectDataSourceMethodEventHandler オブジェクトで、これを使用することにより、Insert 操作が続行される前に入力パラメータを操作できます。UpdateEmployeeInfo メソッドにはパラメータとして NorthwindEmployee オブジェクトが必要なため、このパラメータが文字列のコレクションを使用して作成され、InputParameters コレクションに追加されます。

Visual Basic

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB"
 Assembly="Samples.AspNet.VB"
 %>
<%@ Import namespace="Samples.AspNet.VB"
 %>
<%@ Page language="vb" %>
<Script runat="server">
Private Sub NorthwindEmployeeInserting(source
 As Object, e As ObjectDataSourceMethodEventArgs)

  ' The GridView control passes an array of strings in the parameters
  ' collection because that is the type it knows how to work with.
  ' However, the business object expects a custom type. Build it
  ' and add it to the parameters collection.
  Dim paramsFromPage As IDictionary = e.InputParameters

  Dim ne As New NorthwindEmployee()
  ne.FirstName  = paramsFromPage("FirstName").ToString()
  ne.LastName   = paramsFromPage("LastName").ToString()
  ne.Title      = paramsFromPage("Title").ToString()
  ne.Courtesy   = paramsFromPage("Courtesy").ToString()
  ne.Supervisor = Int32.Parse(paramsFromPage("Supervisor").ToString())
  
  paramsFromPage.Clear()
  paramsFromPage.Add("ne", ne)
End Sub ' NorthwindEmployeeInserting

</Script>
<html>
  <head>
    <title>ObjectDataSource - VB Example</title>
  </head>
  <body>
    <form id="Form1" method="post"
 runat="server">

        <asp:detailsview
          id="DetailsView1"
          runat="server"
          autogenerateinsertbutton="True"
          datasourceid="ObjectDataSource1">
        </asp:detailsview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetEmployee"
          insertmethod="UpdateEmployeeInfo"
          oninserting="NorthwindEmployeeInserting"
          typename="Samples.AspNet.VB.EmployeeLogic"
 >
          <selectparameters>
            <asp:parameter name="anID" defaultvalue="-1"
 />
          </selectparameters>
        </asp:objectdatasource>

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

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS"
 Assembly="Samples.AspNet.CS" %>
<%@ Import namespace="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<Script runat="server">
private void NorthwindEmployeeInserting(object
 source, ObjectDataSourceMethodEventArgs e)
{
  // The business object expects a custom type. Build it
  // and add it to the parameters collection.
  
  IDictionary paramsFromPage = e.InputParameters;

  NorthwindEmployee ne = new NorthwindEmployee();

  ne.FirstName  = paramsFromPage["FirstName"].ToString();
  ne.LastName   = paramsFromPage["LastName"].ToString();
  ne.Title      = paramsFromPage["Title"].ToString();
  ne.Courtesy   = paramsFromPage["Courtesy"].ToString();
  ne.Supervisor = Int32.Parse(paramsFromPage["Supervisor"].ToString());

  paramsFromPage.Clear();
  paramsFromPage.Add("ne", ne);
}

</Script>
<html>
  <head>
    <title>ObjectDataSource - C# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <asp:detailsview
          id="DetailsView1"
          runat="server"
          autogenerateinsertbutton="True"
          datasourceid="ObjectDataSource1">
        </asp:detailsview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetEmployee"
          insertmethod="UpdateEmployeeInfo"
          oninserting="NorthwindEmployeeInserting"
          typename="Samples.AspNet.CS.EmployeeLogic"
          >
          <selectparameters>
            <asp:parameter name="anID" defaultvalue="-1" />
          </selectparameters>
        </asp:objectdatasource>

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

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL"
 Assembly="Samples.AspNet.JSL" %>
<%@ Import namespace="Samples.AspNet.JSL" %>
<%@ Page language="VJ#" %>
<Script runat="server">
private void NorthwindEmployeeInserting(Object
 source,
    ObjectDataSourceMethodEventArgs e)
{
    // The GridView control passes an array of strings in the parameters
    // collection because that is the type it knows how to work with.
    // However, the business object expects a custom type. Build it
    // and add it to the parameters collection.
    IDictionary paramsFromPage = e.get_InputParameters();

    NorthwindEmployee ne =  new NorthwindEmployee();
    ne.set_FirstName(paramsFromPage.get_Item("FirstName").ToString());
    ne.set_LastName (paramsFromPage.get_Item("LastName").ToString());
    ne.set_Title(paramsFromPage.get_Item("Title").ToString());
    ne.set_Courtesy(paramsFromPage.get_Item("Courtesy").ToString());
    ne.set_Supervisor(Int32.Parse(paramsFromPage.
        get_Item("Supervisor").ToString()));

    paramsFromPage.Clear();
    paramsFromPage.Add("ne", ne);
}

</Script>
<html>
  <head>
    <title>ObjectDataSource - VJ# Example</title>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">

        <asp:detailsview
          id="DetailsView1"
          runat="server"
          autogenerateinsertbutton="True"
          datasourceid="ObjectDataSource1">
        </asp:detailsview>

        <asp:objectdatasource
          id="ObjectDataSource1"
          runat="server"
          selectmethod="GetEmployee"
          insertmethod="UpdateEmployeeInfo"
          oninserting="NorthwindEmployeeInserting"
          typename="Samples.AspNet.JSL.EmployeeLogic" >
          <selectparameters>
            <asp:parameter name="anID" defaultvalue="-1" />
          </selectparameters>
        </asp:objectdatasource>

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

前のコード例で使用した中間層ビジネスオブジェクトの例を提供するコード例を次に示します。このコード例は、次の 2 つの基本クラスと 1 つの追加クラスで構成されます。

EmployeeLogic クラス。このクラスはビジネスロジックをカプセル化する、状態のないクラスです。
NorthwindEmployee クラス。このクラスは、データ層からデータを読み込んで永続化するために必要な基本機能だけを格納するモデルクラスです。
便宜的に追加された NorthwindDataException クラス。

これらのサンプルクラスは、Northwind Traders データベース (Microsoft SQL Server および Microsoft Access に付属のサンプルデータベース) で動作します。実際に動作させるためには、これらのクラスをアプリケーションのルートの下にある App_Code ディレクトリに格納して使用するか、またはこれらのクラスをライブラリにコンパイルし、作成された DLL を Bin ディレクトリ内に格納して使用します。UpdateEmployeeInfo メソッドは、完全には実装されていません。そのため、この例を実行しても、Northwind Traders データベースにデータは挿入されません。

Visual Basic

Imports System
Imports System.Collections
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.UI
Imports System.Web.UI.WebControls

Namespace Samples.AspNet.VB

'
' EmployeeLogic is a stateless business object that encapsulates
' the operations you can perform on a NorthwindEmployee object.
'
Public Class EmployeeLogic

   ' Returns a collection of NorthwindEmployee objects.
   Public Shared Function
 GetAllEmployees() As ICollection

      Dim al As New ArrayList()

      Dim cts As ConnectionStringSettings =
 ConfigurationManager.ConnectionStrings("NorthwindConnection")

      Dim sds As New SqlDataSource(cts.ConnectionString,
 "SELECT EmployeeID FROM Employees")

      Try
         Dim IDs As IEnumerable = sds.Select(DataSourceSelectArguments.Empty)

         ' Iterate through the Enumeration and create a
         ' NorthwindEmployee object for each ID.
         Dim enumerator As IEnumerator = IDs.GetEnumerator()
         While enumerator.MoveNext()
            ' The IEnumerable contains DataRowView objects.
            Dim row As DataRowView = CType(enumerator.Current
,DataRowView)
            Dim id As String
 = row("EmployeeID").ToString()
            Dim nwe As New
 NorthwindEmployee(id)
            ' Add the NorthwindEmployee object to the collection.
            al.Add(nwe)
         End While
      Finally
         ' If anything strange happens, clean up.
         sds.Dispose()
      End Try

      Return al
   End Function 'GetAllEmployees


   Public Shared Function
 GetEmployee(anID As Object) As
 NorthwindEmployee
      If anID.Equals("-1") OrElse
 anID.Equals(DBNull.Value) Then
         Return New NorthwindEmployee()
      Else
         Return New NorthwindEmployee(anID)
      End If
   End Function 'GetEmployee


   Public Shared Sub UpdateEmployeeInfo(ne
 As NorthwindEmployee)
      Dim retval As Boolean
 = ne.Save()
      If Not retval Then
         Throw New NorthwindDataException("UpdateEmployee
 failed.")
      End If
   End Sub 'UpdateEmployeeInfo

   Public Shared Sub DeleteEmployee(ne
 As NorthwindEmployee)
      Dim retval As Boolean
 = ne.Delete()
      If Not retval Then
         Throw New NorthwindDataException("DeleteEmployee
 failed.")
      End If
   End Sub 'DeleteEmployee

   ' And so on...

End Class 'EmployeeLogic


Public Class NorthwindEmployee


   Public Sub New()
      ID = DBNull.Value
      lastName = ""
      firstName = ""
      title = ""
      titleOfCourtesy = ""
      reportsTo = - 1
   End Sub 'New


   Public Sub New(anID As
 Object)
      Me.ID = anID

      Dim cts As ConnectionStringSettings =
 ConfigurationManager.ConnectionStrings("NorthwindConnection")

      Dim conn As New SqlConnection(cts.ConnectionString)

      Dim sc As New SqlCommand("
 SELECT FirstName,LastName,Title,TitleOfCourtesy,ReportsTo " & _
                               " FROM Employees "
 & _
                               " WHERE EmployeeID = @empId",
 conn)

      ' Add the employee ID parameter and set its value.
      sc.Parameters.Add(New SqlParameter("@empId",
 SqlDbType.Int)).Value = Int32.Parse(anID.ToString())
      Dim sdr As SqlDataReader = Nothing

      Try
         conn.Open()
         sdr = sc.ExecuteReader()

         ' Only loop once.
         If Not (sdr Is
 Nothing) AndAlso sdr.Read() Then
            ' The IEnumerable contains DataRowView objects.
            Me.aFirstName = sdr("FirstName").ToString()
            Me.aLastName = sdr("LastName").ToString()
            Me.aTitle = sdr("Title").ToString()
            Me.titleOfCourtesy = sdr("TitleOfCourtesy").ToString()
            If Not sdr.IsDBNull(4) Then
               Me.reportsTo = sdr.GetInt32(4)
            End If
         Else
            Throw New NorthwindDataException("Data
 not loaded for employee id.")
         End If
      Finally
         Try
            If Not (sdr Is
 Nothing) Then
               sdr.Close()
            End If
            conn.Close()
         Catch se As SqlException
            ' Log an event in the Application Event Log.
            Throw
         End Try
      End Try
   End Sub 'New

   Private ID As Object
   Public ReadOnly Property
 EmpID() As String
      Get
         Return ID.ToString()
      End Get
   End Property

   Private aLastName As String
   Public Property LastName() As
 String
      Get
         Return aLastName
      End Get
      Set
         aLastName = value
      End Set
   End Property

   Private aFirstName As String
   Public Property FirstName() As
 String
      Get
         Return aFirstName
      End Get
      Set
         aFirstName = value
      End Set
   End Property

   Public ReadOnly Property
 FullName() As String
      Get
         Return FirstName & " "
 & LastName
      End Get
   End Property

   Private aTitle As String
   Public Property Title() As
 String
      Get
         Return aTitle
      End Get
      Set
         aTitle = value
      End Set
   End Property

   Private titleOfCourtesy As String
   Public Property Courtesy() As
 String
      Get
         Return titleOfCourtesy
      End Get
      Set
         titleOfCourtesy = value
      End Set
   End Property

   Private reportsTo As Integer
   Public Property Supervisor() As
 Integer
      Get
         Return reportsTo
      End Get
      Set
         reportsTo = value
      End Set
   End Property

   Public Function Save() As
 Boolean

      ' Implement persistence logic.
      Return True

   End Function 'Save


   Public Function Delete() As
 Boolean

     ' Implement delete logic.
     Return True

   End Function 'Delete
End Class 'NorthwindEmployee


Friend Class NorthwindDataException
   Inherits Exception

   Public Sub New(msg As
 String)
      MyBase.New(msg)
   End Sub 'New
End Class 'NorthwindDataException

End Namespace

namespace Samples.AspNet.CS {

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI;
using System.Web.UI.WebControls;
  //
  // EmployeeLogic is a stateless business object that encapsulates
  // the operations you can perform on a NorthwindEmployee object.
  //
  public class EmployeeLogic {

    // Returns a collection of NorthwindEmployee objects.
    public static ICollection GetAllEmployees
 () {
      ArrayList al = new ArrayList();

      ConnectionStringSettings cts = ConfigurationManager.ConnectionStrings["NorthwindConnection"];

      SqlDataSource sds
        = new SqlDataSource(cts.ConnectionString,
                            "SELECT EmployeeID FROM Employees");
      try {
        IEnumerable IDs = sds.Select(DataSourceSelectArguments.Empty);

        // Iterate through the Enumeration and create a
        // NorthwindEmployee object for each ID.
        IEnumerator enumerator = IDs.GetEnumerator();
        while (enumerator.MoveNext()) {
          // The IEnumerable contains DataRowView objects.
          DataRowView row = enumerator.Current as DataRowView;
          string id = row["EmployeeID"].ToString();
          NorthwindEmployee nwe = new NorthwindEmployee(id);
          // Add the NorthwindEmployee object to the collection.
          al.Add(nwe);
        }
      }
      finally {
        // If anything strange happens, clean up.
        sds.Dispose();
      }

      return al;
    }

    public static NorthwindEmployee GetEmployee(object
 anID) {
      if (anID.Equals("-1") ||
          anID.Equals(DBNull.Value) ) {
        return new NorthwindEmployee();
      }
      else {
        return new NorthwindEmployee(anID);
      }
    }

    public static void UpdateEmployeeInfo(NorthwindEmployee
 ne) {
      bool retval = ne.Save();
      if (! retval) { throw new NorthwindDataException("UpdateEmployee
 failed."); }
    }

    public static void DeleteEmployee(NorthwindEmployee
 ne) {
      bool retval = ne.Delete();
      if (! retval) { throw new NorthwindDataException("DeleteEmployee
 failed."); }
    }

    // And so on...
  }

  public class NorthwindEmployee {

    public NorthwindEmployee () {
      ID = DBNull.Value;
      lastName = "";
      firstName = "";
      title="";
      titleOfCourtesy = "";
      reportsTo = -1;
    }

    public NorthwindEmployee (object anID) {
      this.ID = anID;

      SqlConnection conn
        = new SqlConnection (ConfigurationManager.ConnectionStrings["NorthwindConnection"].ConnectionString);
      SqlCommand sc =
        new SqlCommand(" SELECT FirstName,LastName,Title,TitleOfCourtesy,ReportsTo
 " +
                       " FROM Employees " +
                       " WHERE EmployeeID = @empId",
                       conn);
      // Add the employee ID parameter and set its value.
      sc.Parameters.Add(new SqlParameter("@empId",SqlDbType.Int)).Value
 = Int32.Parse(anID.ToString());
      SqlDataReader sdr = null;

      try {
        conn.Open();
        sdr = sc.ExecuteReader();

        // Only loop once.
        if (sdr != null && sdr.Read())
 {
          // The IEnumerable contains DataRowView objects.
          this.firstName        = sdr["FirstName"].ToString();
          this.lastName         = sdr["LastName"].ToString();
          this.title            = sdr["Title"].ToString();
          this.titleOfCourtesy  = sdr["TitleOfCourtesy"].ToString();
          if (! sdr.IsDBNull(4)) {
            this.reportsTo        = sdr.GetInt32(4);
          }
        }
        else {
          throw new NorthwindDataException("Data not loaded
 for employee id.");
        }
      }
      finally {
        try {
          if (sdr != null) sdr.Close();
          conn.Close();
        }
        catch (SqlException) {
          // Log an event in the Application Event Log.
          throw;
        }
      }
    }

    private object ID;
    public string EmpID {
      get { return ID.ToString();  }
    }

    private string lastName;
    public string LastName {
      get { return lastName; }
      set { lastName = value; }
    }

    private string firstName;
    public string FirstName {
      get { return firstName; }
      set { firstName = value;  }
    }

    public string FullName {
      get { return FirstName + " "
 + LastName; }
    }

    private string title;
    public String Title {
      get { return title; }
      set { title = value; }
    }

    private string titleOfCourtesy;
    public string Courtesy {
      get { return titleOfCourtesy; }
      set { titleOfCourtesy = value; }
    }

    private int    reportsTo;
    public int Supervisor {
      get { return reportsTo; }
      set { reportsTo = value; }
    }

    public bool Save () {
      // Implement persistence logic.
      return true;
    }

    public bool Delete () {
      // Implement delete logic.
      return true;
    }
  }

  internal class NorthwindDataException: Exception {
    public NorthwindDataException(string msg)
 : base (msg) { }
  }
}

package  Samples.AspNet.JSL;

import System.*;
import System.Collections.*;
import System.Configuration.*;
import System.Data.*;
import System.Data.SqlClient.*;
import System.Web.UI.*;
import System.Web.UI.WebControls.*;
   
//
// EmployeeLogic is a stateless business object that encapsulates
// the operations you can perform on a NorthwindEmployee object.
//
public class EmployeeLogic
{    
    // Returns a collection of NorthwindEmployee objects.
    public static ICollection GetAllEmployees()
 throws
        NorthwindDataException, SqlException
    {
        ArrayList al =  new ArrayList();

        ConnectionStringSettings cts = 
            ConfigurationManager.get_ConnectionStrings().
            get_Item("NorthwindConnection");
            //ConfigurationSettings.get_ConnectionStrings().get_Item("NorthwindConnection");

        SqlDataSource sds = new SqlDataSource(cts.get_ConnectionString()
,
            "SELECT EmployeeID FROM Employees");
        try { 
            IEnumerable ids = sds.Select(DataSourceSelectArguments.get_Empty());
            
            // Iterate through the Enumeration and create a
            // NorthwindEmployee object for each id.
            IEnumerator enumerator = ids.GetEnumerator();
            while(enumerator.MoveNext()) {
                // The IEnumerable contains DataRowView objects.
                DataRowView row = (DataRowView) enumerator.get_Current();
                String id = row.get_Item("EmployeeID").ToString();
                NorthwindEmployee nwe =  new NorthwindEmployee(id);
                // Add the NorthwindEmployee object to the collection.
                al.Add(nwe);
            }
        }
        finally {
            // If anything strange happens, clean up.
            sds.Dispose();
        }
        return al;
    } //GetAllEmployees

    public static NorthwindEmployee GetEmployee(Object
 anId) throws 
        NorthwindDataException, SqlException
    {
        if (anId.Equals("-1") || anId.Equals(DBNull.Value))
 {
            return new NorthwindEmployee();
        }
        else {
            return new NorthwindEmployee(anId);
        }
    } //GetEmployee

    public static void UpdateEmployeeInfo(NorthwindEmployee
 ne) throws 
        NorthwindDataException
    {
        boolean retval = ne.Save();
        if (!retval) {
            throw new NorthwindDataException("UpdateEmployee
 failed.");
        }
    } //UpdateEmployeeInfo

    public static void DeleteEmployee(NorthwindEmployee
 ne) throws 
        NorthwindDataException
    {
        boolean retval = ne.Delete();
        if (!retval) {
            throw new NorthwindDataException("DeleteEmployee
 failed.");
        }
    } //DeleteEmployee

    // And so on...
} //EmployeeLogic
   
public class NorthwindEmployee 
{
    public NorthwindEmployee() 
    {
        id = DBNull.Value;
        lastName = "";
        firstName = "";
        title = "";
        titleOfCourtesy = "";
        reportsTo =-1;
    } //NorthwindEmployee

    public NorthwindEmployee(Object anId) throws 
        NorthwindDataException ,SqlException
    {
        this.id = anId;
            

        SqlConnection conn = new SqlConnection(ConfigurationManager.
            get_ConnectionStrings().get_Item("NorthwindConnection").get_ConnectionString());
         SqlCommand sc =  new SqlCommand(
            " SELECT FirstName,LastName,Title,TitleOfCourtesy,ReportsTo "
 
            + " FROM Employees WHERE EmployeeID = @empId", conn);
         // Add the employee id parameter and set its value.
         sc.get_Parameters().Add(new SqlParameter("@empId",
 SqlDbType.Int)).
             set_Value(anId.ToString());
         SqlDataReader sdr = null;
         
         try {
            conn.Open();
            sdr = sc.ExecuteReader();
            // Only loop once.
            if (sdr  != null && sdr.Read())
 {
                // The IEnumerable contains DataRowView objects.
                this.firstName = sdr.get_Item( "FirstName").ToString();
                this.lastName = sdr.get_Item( "LastName").ToString();
                this.title = sdr.get_Item( "Title").ToString();
                this.titleOfCourtesy = sdr.get_Item( "TitleOfCourtesy").
                    ToString();
                if (!(sdr.IsDBNull(4))) {
                    this.reportsTo = sdr.GetInt32(4);
                }
            }
            else {
                throw new NorthwindDataException(
                    "Data not loaded for employee id.");
            }
        }
        finally {
            try {
                if (sdr != null) {
                    sdr.Close();
                }
                conn.Close();
            }
            catch(SqlException exp){   
            // Log an event in the Application Event Log.
            throw exp;
            }
        }
    } //NorthwindEmployee
      
    private Object id;
     
    /** @property 
     */
    public String get_EmpID()
    {
        return id.ToString();
    } //get_EmpID

    private String lastName;
      
      /** @property 
       */
    public String get_LastName()
    {
        return lastName;
    } //get_LastName

    /** @property 
     */
    public void set_LastName (String value)
    {
        lastName = value;
    } //set_LastName

    private String firstName;
      
    /** @property 
     */
    public String get_FirstName()
    {
        return firstName;
    } //get_FirstName

    /** @property 
     */
    public void set_FirstName (String value)
    {
        firstName = value;
    } //set_FirstName 

    /** @property 
     */
    public String get_FullName()
    {
        return get_FirstName() + " " + get_LastName();
    } //get_FullName

    private String title;
      
    /** @property 
     */
    public String get_Title()
    {
        return title;
    } //get_Title

    /** @property 
     */
    public void set_Title (String value)
    {
        title = value;
    } //set_Title 

    private String titleOfCourtesy;
      
    /** @property 
     */
    public String get_Courtesy()
    {
        return titleOfCourtesy;
    } //get_Courtesy

    /** @property 
     */
    public void set_Courtesy (String value)
    {
        titleOfCourtesy = value;
    } //set_Courtesy 

    private int reportsTo;
      
    /** @property 
     */
    public int get_Supervisor()
    {
        return reportsTo;
    }//get_Supervisor

    /** @property 
     */
    public void set_Supervisor (int
 value)
    {
        reportsTo = value;
    } //set_Supervisor 

    public boolean Save() 
    {
        // Implement persistence logic.
        return true;
    } //Save
      
    public boolean Delete() 
    {
        // Implement delete logic.
        return true;
    } //Delete
} //NorthwindEmployee

public class NorthwindDataException extends
 System.Exception
{
    public NorthwindDataException(String msg)
    {
         super(msg);
    } //NorthwindDataException
} //NorthwindDataException

プラットフォーム

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

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0

参照

関連項目
System.Web.UI.WebControls 名前空間
ObjectDataSourceMethodEventArgs クラス
ObjectDataSourceStatusEventHandler
ObjectDataSource クラス
OnSelecting
OnUpdating
OnInserting
OnDeleting

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ObjectDataSourceMethodEventHandler デリゲート

「ObjectDataSourceMethodEventHandler デリゲート」の関連用語


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ObjectDataSourceMethodEventHandler デリゲートとは？わかりやすく解説