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

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GridViewCancelEditEventHandler デリゲート

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

GridView コントロールの RowCancelingEdit イベント処理するメソッド表します

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

Public Delegate Sub GridViewCancelEditEventHandler
 ( _
    sender As Object, _
    e As GridViewCancelEditEventArgs _
)
Dim instance As New GridViewCancelEditEventHandler(AddressOf
 HandlerMethod)
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
)
JScript では、デリゲート使用できますが、新規に宣言することはできません。

パラメータ

sender

イベントソース

e

イベント データ格納している GridViewCancelEditEventArgs オブジェクト

解説解説
使用例使用例

GridViewCancelEditEventHandler デリゲートを、プログラムによって GridView コントロールRowCancelingEdit イベント追加する方法次の例に示します

<%@ 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RowCancelingEdit イベント追加する方法次の例に示します

<%@ 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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バージョン情報バージョン情報
参照参照
関連項目
System.Web.UI.WebControls 名前空間
GridView クラス
GridViewCancelEditEventArgs クラス
GridView.RowCancelingEdit イベント
OnRowCancelingEdit
その他の技術情報
イベントデリゲート


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