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

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.NET Framework クラスライブラリリファレンス

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DetailsViewInsertedEventHandler 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。

DetailsView コントロールの ItemInserted 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 DetailsViewInsertedEventHandler
 ( _
    sender As Object, _
    e As DetailsViewInsertedEventArgs _
)

Visual Basic (使用法)

Dim instance As New DetailsViewInsertedEventHandler(AddressOf
 HandlerMethod)

public delegate void DetailsViewInsertedEventHandler
 (
    Object sender,
    DetailsViewInsertedEventArgs e
)

C++

public delegate void DetailsViewInsertedEventHandler
 (
    Object^ sender, 
    DetailsViewInsertedEventArgs^ e
)

/** @delegate */
public delegate void DetailsViewInsertedEventHandler
 (
    Object sender, 
    DetailsViewInsertedEventArgs 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。

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

解説

DetailsView コントロールは、コントロール内の Insert ボタン (CommandName プロパティが "Insert" に設定されたボタン) がクリックされた場合に、DetailsView コントロールが実際にレコードを挿入した後に ItemInserted 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 (挿入操作の結果を確認するなど) を実行するイベントハンドラを提供できます。

DetailsViewInsertedEventHandler 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。

使用例

DetailsViewInsertedEventHandler デリゲートを、プログラムによって DetailsView コントロールの ItemInserted イベントに追加する方法のコード例を次に示します。

Visual Basic

<%@ page language="VB"%>
  
<script runat="server">

  Sub Page_Load(ByVal sender As
 Object, ByVal e As EventArgs)

    ' Create a new DetailsView object.
    Dim customerDetailsView As New
 DetailsView()
    
    ' Set the DetailsView object's properties.
    customerDetailsView.ID = "CustomerDetailsView"
    customerDetailsView.DataSourceID = "DetailsViewSource"
    customerDetailsView.AutoGenerateRows = True
    customerDetailsView.AutoGenerateInsertButton = True
    customerDetailsView.AllowPaging = true
    
    Dim keyArray() As String
 = {"CustomerID"}
    customerDetailsView.DataKeyNames = keyArray
    
    ' Programmatically register the event-handling method
    ' for the ItemInserted event of a DetailsView control.
    AddHandler customerDetailsView.ItemInserted, _
      AddressOf CustomerDetailsView_ItemInserted

    ' Add the DetailsView object to the Controls collection
    ' of the PlaceHolder control.
    DetailsViewPlaceHolder.Controls.Add(customerDetailsView)

  End Sub

  Sub CustomerDetailsView_ItemInserted(ByVal
 sender As Object, _
    ByVal e As DetailsViewInsertedEventArgs)
 
    ' Use the Exception property to determine whether an exception
    ' occurred during the insert operation.
    If e.Exception Is Nothing
 Then
    
      ' Use the Values property to get the value entered by 
      ' the user for the CompanyName field.
      Dim name As String
 = e.Values("CompanyName").ToString()

      ' Display a confirmation message.
      MessageLabel.Text = name & " added successfully. "

    Else
    
      ' Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message

      ' Use the ExceptionHandled property to indicate that the 
      ' exception is already handled.
      e.ExceptionHandled = True

      ' When an exception occurs, keep the DetailsView
      ' control in insert mode.
      e.KeepInInsertMode = True
    
    End If
      
  End Sub

</script>
 
 <html>   
  <body>
    <form runat="server">
        
      <h3>DetailsViewInsertedEventHandler Example</h3>
        
        <!-- Use a PlaceHolder control as the container for
 the -->
        <!-- dynamically generated DetailsView control.         -->       
        <asp:PlaceHolder id="DetailsViewPlaceHolder"
          runat="server"/>
          
        <br/><br/>
        
        <asp:label id="MessageLabel"
          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="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName],
 
            [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
 
          runat="server"/>
            
      </form>
  </body>
</html>

<%@ page language="C#"%>
  
<script runat="server">

  void Page_Load(Object sender, EventArgs e)
  {
    
    // Create a new DetailsView object.
    DetailsView customerDetailsView = new DetailsView();
    
    // Set the DetailsView object's properties.
    customerDetailsView.ID = "CustomerDetailsView";
    customerDetailsView.DataSourceID = "DetailsViewSource";
    customerDetailsView.AutoGenerateRows = true;
    customerDetailsView.AutoGenerateInsertButton = true;
    customerDetailsView.AllowPaging = true;
    customerDetailsView.DataKeyNames = new String[1] { "CustomerID"
 };
    
    // Programmatically register the event-handling method
    // for the ItemInserted event of a DetailsView control.
    customerDetailsView.ItemInserted 
      += new DetailsViewInsertedEventHandler(
      this.CustomerDetailsView_ItemInserted);

    // Add the DetailsView object to the Controls collection
    // of the PlaceHolder control.
    DetailsViewPlaceHolder.Controls.Add(customerDetailsView);

  }

  void CustomerDetailsView_ItemInserted(Object sender, 
    DetailsViewInsertedEventArgs e)
  {
    // Use the Exception property to determine whether an exception
    // occurred during the insert operation.
    if (e.Exception == null)
    {
      // Use the Values property to get the value entered by 
      // the user for the CompanyName field.
      String name = e.Values["CompanyName"].ToString();

      // Display a confirmation message.
      MessageLabel.Text = name + " added successfully. ";

    }
    else
    {
      // Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message;

      // Use the ExceptionHandled property to indicate that the 
      // exception is already handled.
      e.ExceptionHandled = true;

      // When an exception occurs, keep the DetailsView
      // control in insert mode.
      e.KeepInInsertMode = true;
    }
  }

</script>
 
 <html>   
  <body>
    <form runat="server">
        
      <h3>DetailsViewInsertedEventHandler Example</h3>
        
        <!-- Use a PlaceHolder control as the container for
 the -->
        <!-- dynamically generated DetailsView control.         -->       
        <asp:PlaceHolder id="DetailsViewPlaceHolder"
          runat="server"/>
          
        <br/><br/>
        
        <asp:label id="MessageLabel"
          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="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName],
 
            [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

DetailsViewInsertedEventHandler デリゲートを、宣言によって DetailsView コントロールの ItemInserted イベントに追加する方法のコード例を次に示します。

Visual Basic

<%@ Page language="VB" autoeventwireup="false"
 %>

<script runat="server">

  Sub CustomerDetailsView_ItemInserted(ByVal
 sender As Object, _
    ByVal e As DetailsViewInsertedEventArgs)
 _
    Handles CustomerDetailsView.ItemInserted
  
    ' Use the Exception property to determine whether an exception
    ' occurred during the insert operation.
    If e.Exception Is Nothing
 Then
    
      ' Use the Values property to get the value entered by 
      ' the user for the CompanyName field.
      Dim name As String
 = e.Values("CompanyName").ToString()

      ' Display a confirmation message.
      MessageLabel.Text = name & " added successfully. "
      
    Else
    
      ' Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message
      
      ' Use the ExceptionHandled property to indicate that the 
      ' exception is already handled.
      e.ExceptionHandled = True
      
      ' When an exception occurs, keep the DetailsView
      ' control in insert mode.
      e.KeepInInsertMode = True
    
    End If
      
  End Sub

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>DetailsViewInsertedEventHandler Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogenerateinsertbutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          oniteminserted="CustomerDetailsView_ItemInserted"
 
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <asp:label id="MessageLabel"
          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="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName],
 
            [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, @PostalCode, @Country)"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
 
          runat="server"/>
            
      </form>
  </body>
</html>

<%@ Page language="C#" %>

<script runat="server">

  void CustomerDetailsView_ItemInserted(Object sender, DetailsViewInsertedEventArgs
 e)
  {
    // Use the Exception property to determine whether an exception
    // occurred during the insert operation.
    if (e.Exception == null)
    {
      // Use the Values property to get the value entered by 
      // the user for the CompanyName field.
      String name = e.Values["CompanyName"].ToString();

      // Display a confirmation message.
      MessageLabel.Text = name + " added successfully. ";
      
    }
    else
    {
      // Insert the code to handle the exception.
      MessageLabel.Text = e.Exception.Message;
      
      // Use the ExceptionHandled property to indicate that the 
      // exception is already handled.
      e.ExceptionHandled = true;
      
      // When an exception occurs, keep the DetailsView
      // control in insert mode.
      e.KeepInInsertMode = true;
    }
  }

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>DetailsViewInsertedEventHandler Example</h3>
                
        <asp:detailsview id="CustomerDetailsView"
          datasourceid="DetailsViewSource"
          datakeynames="CustomerID"
          autogenerateinsertbutton="true"  
          autogeneraterows="true"
          allowpaging="true"
          oniteminserted="CustomerDetailsView_ItemInserted" 
          runat="server">
               
          <fieldheaderstyle backcolor="Navy"
            forecolor="White"/>
                    
        </asp:detailsview>
        
        <asp:label id="MessageLabel"
          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="DetailsViewSource"
          selectcommand="Select [CustomerID], [CompanyName], [Address], 
            [City], [PostalCode], [Country] From [Customers]"
          insertcommand="INSERT INTO [Customers]([CustomerID], [CompanyName],
 
            [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"
          connectionstring=
            "<%$ ConnectionStrings:NorthWindConnectionString%>" 
          runat="server"/>
            
      </form>
  </body>
</html>

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
DetailsView クラス
DetailsViewInsertedEventArgs クラス
DetailsView.ItemInserted イベント
OnItemInserted
その他の技術情報
イベントとデリゲート

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

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