GridViewUpdatedEventHandler 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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GridViewUpdatedEventHandler 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。

GridView コントロールの RowUpdated 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 GridViewUpdatedEventHandler
 ( _
    sender As Object, _
    e As GridViewUpdatedEventArgs _
)

Visual Basic (使用法)

Dim instance As New GridViewUpdatedEventHandler(AddressOf
 HandlerMethod)

public delegate void GridViewUpdatedEventHandler
 (
    Object sender,
    GridViewUpdatedEventArgs e
)

C++

public delegate void GridViewUpdatedEventHandler
 (
    Object^ sender, 
    GridViewUpdatedEventArgs^ e
)

/** @delegate */
public delegate void GridViewUpdatedEventHandler
 (
    Object sender, 
    GridViewUpdatedEventArgs 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 GridViewUpdatedEventArgs。

解説

GridView コントロールは、コントロール内の Update ボタン (CommandName プロパティが "Update" 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更新した後に RowUpdated 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 (更新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。

GridViewUpdatedEventHandler 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

GridViewUpdatedEventHandler デリゲートを、プログラムによって GridView コントロールの RowUpdated イベントに追加する方法を次の例に示します。

Visual Basic

<%@ Page language="VB" %>

<script runat="server">
  
  Sub Page_Load(ByVal sender As
 Object, ByVal e As EventArgs)

    ' Create a new GridView control.
    Dim customersGridView As New
 GridView()
    
    ' Set the GridView control's properties.
    customersGridView.ID = "CustomersGridView"
    customersGridView.DataSourceID = "CustomersSqlDataSource"
    customersGridView.AutoGenerateColumns = True
    customersGridView.AutoGenerateEditButton = True
    customersGridView.AllowPaging = 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.RowUpdated, AddressOf
 CustomersGridView_RowUpdated
    AddHandler customersGridView.RowCancelingEdit, AddressOf
 CustomersGridView_RowCancelingEdit
    AddHandler customersGridView.RowEditing, AddressOf
 CustomersGridView_RowEditing
    
    ' Add the GridView control to the Controls collection
    ' of the PlaceHolder control.
    GridViewPlaceHolder.Controls.Add(customersGridView)
    
  End Sub

  Sub CustomersGridView_RowUpdated(ByVal sender
 As Object, ByVal e As
 GridViewUpdatedEventArgs)
    
    ' Indicate whether the update operation succeeded.
    If e.Exception Is Nothing
 Then
    
      Message.Text = "Row updated successfully."
    
    Else
    
      e.ExceptionHandled = True
      Message.Text = "An error occurred while attempting to update
 the row."
    
    End If
    
  End Sub

  Sub CustomersGridView_RowCancelingEdit(ByVal
 sender As Object, ByVal
 e As GridViewCancelEditEventArgs)
        
    ' The update operation was canceled. Clear the message label.
    Message.Text = ""
    
  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
    

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridView GridViewUpdatedEventHandler 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 control.
    GridView customersGridView = new GridView();

    // Set the GridView control's properties.
    customersGridView.ID = "CustomersGridView";
    customersGridView.DataSourceID = "CustomersSqlDataSource";
    customersGridView.AutoGenerateColumns = true;
    customersGridView.AutoGenerateEditButton = true;
    customersGridView.AllowPaging = true;
    customersGridView.DataKeyNames = new String[1] { "CustomerID"
 };

    // Programmatically register the event-handling method
    // for the RowDeleted event of the GridView control.
    customersGridView.RowUpdated += new GridViewUpdatedEventHandler(this.CustomersGridView_RowUpdated);
    customersGridView.RowCancelingEdit += new GridViewCancelEditEventHandler(this.CustomersGridView_RowCancelingEdit);
    customersGridView.RowEditing += new GridViewEditEventHandler(this.CustomersGridView_RowEditing);
    
    // Add the GridView control to the Controls collection
    // of the PlaceHolder control.
    GridViewPlaceHolder.Controls.Add(customersGridView);
    
  }

  void CustomersGridView_RowUpdated(Object sender, GridViewUpdatedEventArgs
 e)
  {
    
    // Indicate whether the update operation succeeded.
    if(e.Exception == null)
    {
      Message.Text = "Row updated successfully.";
    }
    else
    {
      e.ExceptionHandled = true;
      Message.Text = "An error occurred while attempting
 to update the row.";
    }
    
  }

  void CustomersGridView_RowCancelingEdit(Object sender, GridViewCancelEditEventArgs
 e)
  {
        
    // The update operation was canceled. Clear the message label.
    Message.Text = "";
    
  }

  void CustomersGridView_RowEditing(Object sender, GridViewEditEventArgs
 e)
  {
    // The GridView control is entering edit mode. Clear the message
 label.
    Message.Text = "";
  }
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridViewUpdatedEventHandler 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>

GridViewUpdatedEventHandler デリゲートを、宣言によって GridView コントロールの RowUpdated イベントに追加する方法を次の例に示します。

Visual Basic

<%@ Page language="VB" %>

<script runat="server">

  Sub CustomersGridView_RowUpdated(ByVal sender
 As Object, ByVal e As
 GridViewUpdatedEventArgs)
    
    ' Indicate whether the update operation succeeded.
    If e.Exception Is Nothing
 Then
    
      Message.Text = "Row updated successfully."
    
    Else
    
      e.ExceptionHandled = True
      Message.Text = "An error occurred while attempting to update
 the row."
    
    End If
    
  End Sub

  Sub CustomersGridView_RowCancelingEdit(ByVal
 sender As Object, ByVal
 e As GridViewCancelEditEventArgs)
        
    ' The update operation was canceled. Clear the message label.
    Message.Text = ""
    
  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
    

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridView RowUpdated Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
                
      <br/>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property
 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"
        onrowupdated="CustomersGridView_RowUpdated"
        onrowcancelingedit="CustomersGridView_RowCancelingEdit"
        onrowediting="CustomersGridView_RowEditing"
   
        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_RowUpdated(Object sender, GridViewUpdatedEventArgs
 e)
  {
    
    // Indicate whether the update operation succeeded.
    if(e.Exception == null)
    {
      Message.Text = "Row updated successfully.";
    }
    else
    {
      e.ExceptionHandled = true;
      Message.Text = "An error occurred while attempting
 to update the row.";
    }
    
  }

  void CustomersGridView_RowCancelingEdit(Object sender, GridViewCancelEditEventArgs
 e)
  {
        
    // The update operation was canceled. Clear the message label.
    Message.Text = "";
    
  }

  void CustomersGridView_RowEditing(Object sender, GridViewEditEventArgs
 e)
  {
    // The GridView control is entering edit mode. Clear the message
 label.
    Message.Text = "";
  }
    

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridView RowUpdated Example</h3>
            
      <asp:label id="Message"
        forecolor="Red"          
        runat="server"/>
                
      <br/>
            
      <!-- The GridView control automatically sets the columns     -->
      <!-- specified in the datakeynames property 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"
        onrowupdated="CustomersGridView_RowUpdated"
        onrowcancelingedit="CustomersGridView_RowCancelingEdit"
        onrowediting="CustomersGridView_RowEditing"   
        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>

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
GridView クラス
GridViewUpdatedEventArgs クラス
GridView.RowUpdated イベント
OnRowUpdated
その他の技術情報
イベントとデリゲート

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