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

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GridViewEditEventHandler 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 RowEditing 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 GridViewEditEventHandler
 ( _
    sender As Object, _
    e As GridViewEditEventArgs _
)
Dim instance As New GridViewEditEventHandler(AddressOf
 HandlerMethod)
public delegate void GridViewEditEventHandler
 (
    Object sender,
    GridViewEditEventArgs e
)
public delegate void GridViewEditEventHandler
 (
    Object^ sender, 
    GridViewEditEventArgs^ e
)
/** @delegate */
public delegate void GridViewEditEventHandler
 (
    Object sender, 
    GridViewEditEventArgs 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 GridViewEditEventArgs オブジェクト

解説解説
使用例使用例

GridViewEditEventHandler デリゲートを、プログラムによって GridView コントロールRowEditing 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 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.
    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_RowEditing(ByVal sender
 As Object, ByVal e As
 GridViewEditEventArgs)

    ' User the sender parameter to retrieve the GridView control
    ' that raised the event.
    Dim customersGridView As GridView = CType(sender,
 GridView)
    
    ' Get the country for the row being edited. For this example, the
    ' country is contained in the seventh column (index 6). 
    Dim country As String
 = customersGridView.Rows(e.NewEditIndex).Cells(6).Text

    ' For this example, cancel the edit operation if the user attempts
    ' to edit the record of a customer from the USA. 
    If country = "USA" Then
    
      ' Cancel the edit operation.
      e.Cancel = True
      Message.Text = "You cannot edit this record."
    
    Else
    
      Message.Text = ""
      
    End If
    
  End Sub
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridViewEditEventHandler 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[] { "CustomerID"
 };
      
    // Programmatically register the event-handling method.
    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_RowEditing(Object sender, GridViewEditEventArgs
 e)
  {

    // User the sender parameter to retrieve the GridView control
    // that raised the event.
    GridView customersGridView = (GridView)sender;
    
    // Get the country for the row being edited. For this example, the
    // country is contained in the seventh column (index 6). 
    String country = customersGridView.Rows[e.NewEditIndex].Cells[6].Text;

    // For this example, cancel the edit operation if the user attempts
    // to edit the record of a customer from the USA. 
    if (country == "USA")
    {
      // Cancel the edit operation.
      e.Cancel = true;
      Message.Text = "You cannot edit this record.";
    }
    else
    {
      Message.Text = "";
    }
    
  }
    
</script>

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

GridViewEditEventHandler デリゲートを、宣言によって GridView コントロールRowEditing 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_RowEditing(ByVal sender
 As Object, ByVal e As
 GridViewEditEventArgs)
        
    ' Get the country for the row being edited. For this example, the
    ' country is contained in the seventh column (index 6). 
    Dim country As String
 = CustomersGridView.Rows(e.NewEditIndex).Cells(6).Text

    ' For this example, cancel the edit operation if the user attempts
    ' to edit the record of a customer from the United States. 
    If country = "USA" Then
    
      ' Cancel the edit operation.
      e.Cancel = True
      Message.Text = "You cannot edit this record."
     
    Else
      
      Message.Text = ""
      
    End If
    
  End Sub
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridView RowEditing 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"
        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_RowEditing(Object sender, GridViewEditEventArgs
 e)
  {
    
    // Get the country for the row being edited. For this example, the
    // country is contained in the seventh column (index 6). 
    String country = CustomersGridView.Rows[e.NewEditIndex].Cells[6].Text;

    // For this example, cancel the edit operation if the user attempts
    // to edit the record of a customer from the Unites States. 
    if (country == "USA")
    {
      // Cancel the edit operation.
      e.Cancel = true;
      Message.Text = "You cannot edit this record.";
    }
    else
    {
      Message.Text = "";
    }
    
  }
    
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>GridView RowEditing 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"
        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>

プラットフォームプラットフォーム
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
GridViewEditEventArgs クラス
GridView.RowEditing イベント
OnRowEditing
その他の技術情報
イベントデリゲート


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