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

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FormViewDeleteEventHandler 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。

FormView コントロールの ItemDeleting 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 FormViewDeleteEventHandler
 ( _
    sender As Object, _
    e As FormViewDeleteEventArgs _
)

Visual Basic (使用法)

Dim instance As New FormViewDeleteEventHandler(AddressOf
 HandlerMethod)

public delegate void FormViewDeleteEventHandler
 (
    Object sender,
    FormViewDeleteEventArgs e
)

C++

public delegate void FormViewDeleteEventHandler
 (
    Object^ sender, 
    FormViewDeleteEventArgs^ e
)

/** @delegate */
public delegate void FormViewDeleteEventHandler
 (
    Object sender, 
    FormViewDeleteEventArgs 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 FormViewDeleteEventArgs。

解説

FormView コントロールは、コントロール内の Delete ボタン (CommandName プロパティが "Delete" に設定されたボタン) がクリックされた場合に、FormView コントロールが実際にレコードを削除する前に ItemDeleting 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 (削除前にレコードを検査するなど) を実行するイベント処理メソッドを提供できます。

FormViewDeleteEventHandler 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

FormViewDeleteEventHandler デリゲートを、プログラムによって FormView コントロールの ItemDeleting 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" %>
<%@ import namespace="System.Data"%>

<script runat="server">
  
  ' To dynamically create a template for a FormView control,
  ' you must create a custom template class to represent 
  ' the template. This template class represents the item
  ' template for a FormView control.
  Private NotInheritable Class
 EmployeeTemplate
    Implements ITemplate
    
    ' When implementing the ITemplate interface, you must
    ' implement the InstantiateIn method. The FormView
    ' control calls this method to create the template's 
    ' content. 
    Sub InstantiateIn(ByVal container As
 Control) Implements ITemplate.InstantiateIn

      ' Create the child controls contained in the template.
      ' For this example, the item template displays the
      ' FirstName, LastName, and Title fields from the data 
      ' source. To support data-binding, create event handlers 
      ' for the DataBinding event of each child control.
      ' The event handlers must bind the appropriate value 
      ' to each control.
      Dim firstNameLabel As New
 Label()
      firstNameLabel.ID = "FirstNameLabel"
      AddHandler firstNameLabel.DataBinding, AddressOf
 FirstNameLabel_DataBinding

      Dim lastNameLabel As New
 Label()
      lastNameLabel.ID = "LastNameLabel"
      AddHandler lastNameLabel.DataBinding, AddressOf
 LastNameLabel_DataBinding

      Dim titleNameLabel As New
 Label()
      titleNameLabel.ID = "TitleLabel"
      AddHandler titleNameLabel.DataBinding, AddressOf
 TitleLabel_DataBinding

      Dim space As New LiteralControl("&nbsp;")
      Dim titleLineBreak As New
 LiteralControl("<br/>")
      Dim buttonLineBreak As New
 LiteralControl("<br/>")

      Dim deleteButton As New
 Button()
      deleteButton.ID = "DeleteButton"
      deleteButton.CommandName = "Delete"
      deleteButton.Text = "Delete"

      ' Add the controls to the Controls collection of the 
      ' container control.
      container.Controls.Add(firstNameLabel)
      container.Controls.Add(Space)
      container.Controls.Add(lastNameLabel)
      container.Controls.Add(titleLineBreak)
      container.Controls.Add(titleNameLabel)
      container.Controls.Add(buttonLineBreak)
      container.Controls.Add(deleteButton)

    End Sub

    ' This event handler binds the value of the FirstName field
    ' to the FirstNameLabel Label control displayed in the template.
    Private Sub FirstNameLabel_DataBinding(ByVal
 sender As Object, ByVal
 e As EventArgs)

      ' Use the sender parameter to retrieve the Label control
      ' being bound to data.
      Dim firstNameLabelControl As Label =
 CType(sender, Label)

      ' Retrieve the value to bind to the Label control. First,
      ' use the NamingContainer property to retrieve the parent 
      ' control of the Label control. In this example, the parent 
      ' control is the FormView control.
      Dim formViewContainer As FormView = CType(firstNameLabelControl.NamingContainer,
 FormView)
      
      ' Get the data item bound to the FormView control.
      Dim rowView As DataRowView = CType(formViewContainer.DataItem,
 DataRowView)

      ' Use the data item to retrieve the value of the FirstName field.
      ' Set the Text property of the Label control to this value.  
      
      firstNameLabelControl.Text = rowView("FirstName").ToString()
  
    End Sub

    ' This event handler binds the value of the LastName field
    ' to the LastNameLabel Label control displayed in the template.
    Private Sub LastNameLabel_DataBinding(ByVal
 sender As Object, ByVal
 e As EventArgs)

      ' Use the sender parameter to retrieve the Label control
      ' being bound to data.
      Dim lastNameLabelControl As Label = CType(sender,
 Label)

      ' Retrieve the value to bind to the Label control. First,
      ' use the NamingContainer property to retrieve the parent 
      ' control of the Label control. In this example, the parent 
      ' control is the FormView control.
      Dim formViewContainer As FormView = CType(lastNameLabelControl.NamingContainer,
 FormView)

      ' Get the data item bound to the FormView control.
      Dim rowView As DataRowView = CType(formViewContainer.DataItem,
 DataRowView)

      ' Use the data item to retrieve the value of the LastName field.
      ' Set the Text property of the Label control to this value.  
       
      lastNameLabelControl.Text = rowView("LastName").ToString()
    
    End Sub

    ' This event handler binds the value of the Title field
    ' to the TitleLabel Label control displayed in the template.
    Private Sub TitleLabel_DataBinding(ByVal
 sender As Object, ByVal
 e As EventArgs)

      ' Use the sender parameter to retrieve the Label control
      ' being bound to data.
      Dim titleLabelControl As Label = CType(sender,
 Label)

      ' Retrieve the value to bind to the Label control. First,
      ' use the NamingContainer property to retrieve the parent 
      ' control of the Label control. In this example, the parent 
      ' control is the FormView control.
      Dim formViewContainer As FormView = CType(titleLabelControl.NamingContainer,
 FormView)

      ' Get the data item bound to the FormView control.
      Dim rowView As DataRowView = CType(formViewContainer.DataItem,
 DataRowView)

      ' Use the data item to retrieve the value of the LastName field
      ' Set the Text property of the Label control to this value.  
       
      titleLabelControl.Text = rowView("Title").ToString()
    
    End Sub

  End Class

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

    ' Create a new FormView object.
    Dim employeesFormView As New
 FormView()

    ' Set the FormView object's properties.
    employeesFormView.ID = "EmployeesFormView"
    employeesFormView.DataSourceID = "EmployeeSource"
    employeesFormView.AllowPaging = True
    employeesFormView.HeaderText = "Employee Name"
    
    Dim keyArray() As String
 = {"EmployeeID"}
    employeesFormView.DataKeyNames = keyArray

    ' Programmatically register the event handler for the 
    ' ItemDeleting event of the FormView control.
    AddHandler employeesFormView.ItemDeleting, AddressOf
 EmployeeFormView_ItemDeleting

    ' Create the dynamic template using the custom template class.
    employeesFormView.ItemTemplate = New EmployeeTemplate()

    ' Add the FormView object to the Controls collection
    ' of the PlaceHolder control.
    FormViewPlaceHolder.Controls.Add(employeesFormView)

  End Sub

  Sub EmployeeFormView_ItemDeleting(ByVal sender
 As Object, ByVal e As
 FormViewDeleteEventArgs)

    ' Use the sender parameter to retrieve the FormView
    ' control that raised the event.
    Dim employeeFormView As FormView = CType(sender,
 FormView)

    ' Retrieve the TitleLabel Label control from the
    ' data row.
    Dim row As FormViewRow = employeeFormView.Row
    Dim titleLabel As Label = CType(row.FindControl("TitleLabel"),
 Label)

    ' Cancel the delete operation if the user attempts to 
    ' delete a protected record. In this example, records for
    ' employees with a "Sales Manager" job title are protected.
    If (titleLabel.Text.Equals("Sales Manager"))
 Then
    
      e.Cancel = True
      MessageLabel.Text = "You cannot delete this record."
      
    End If

  End Sub

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormViewDeleteEventHandler Example</h3>
      
      <!-- Use a PlaceHolder control as the container for
 the -->
      <!-- dynamically generated FormView control.            -->       
      <asp:placeholder id="FormViewPlaceHolder"
        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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName],
 [Title], [PhotoPath] From [Employees]"
        deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>
            
    </form>
  </body>
</html>

<%@ page language="C#" %>
<%@ import namespace="System.Data"%>

<script runat="server">
  
  // To dynamically create a template for a FormView control,
  // you must create a custom template class to represent 
  // the template. This template class represents the item
  // template for a FormView control.
  private sealed class EmployeeTemplate : ITemplate
  {

    // When implementing the ITemplate interface, you must
    // implement the InstantiateIn method. The FormView
    // control calls this method to create the template's 
    // content. 
    void ITemplate.InstantiateIn(Control container)
    {
      // Create the child controls contained in the template.
      // For this example, the item template displays the
      // FirstName, LastName, and Title fields from the data 
      // source. To support data-binding, create event handlers 
      // for the DataBinding event of each child control.
      // The event handlers must bind the appropriate value 
      // to each control.
      Label firstNameLabel = new Label();
      firstNameLabel.ID = "FirstNameLabel";
      firstNameLabel.DataBinding += new EventHandler(FirstNameLabel_DataBinding);

      Label lastNameLabel = new Label();
      lastNameLabel.ID = "LastNameLabel";
      lastNameLabel.DataBinding += new EventHandler(LastNameLabel_DataBinding);

      Label titleNameLabel = new Label();
      titleNameLabel.ID = "TitleLabel";
      titleNameLabel.DataBinding += new EventHandler(TitleLabel_DataBinding);

      LiteralControl space = new LiteralControl("&nbsp;");
      LiteralControl titleLineBreak = new LiteralControl("<br/>");
      LiteralControl buttonLineBreak = new LiteralControl("<br/>");

      Button deleteButton = new Button();
      deleteButton.ID = "DeleteButton";
      deleteButton.CommandName = "Delete";
      deleteButton.Text = "Delete";

      // Add the controls to the Controls collection of the 
      // container control.
      container.Controls.Add(firstNameLabel);
      container.Controls.Add(space);
      container.Controls.Add(lastNameLabel);
      container.Controls.Add(titleLineBreak);
      container.Controls.Add(titleNameLabel);
      container.Controls.Add(buttonLineBreak);
      container.Controls.Add(deleteButton);

    }

    // This event handler binds the value of the FirstName field
    // to the FirstNameLabel Label control displayed in the template.
    private void FirstNameLabel_DataBinding(Object
 sender, EventArgs e)
    {
      // Use the sender parameter to retrieve the Label control
      // being bound to data.
      Label firstNameLabelControl = (Label)sender;

      // Retrieve the value to bind to the Label control. First,
      // use the NamingContainer property to retrieve the parent 
      // control of the Label control. In this example, the parent 
      // control is the FormView control.
      FormView formViewContainer = (FormView)firstNameLabelControl.NamingContainer;

      // Get the data item bound to the FormView control.
      DataRowView rowView = (DataRowView)formViewContainer.DataItem;

      // Use the data item to retrieve the value of the FirstName field.
      // Set the Text property of the Label control to this value. 
       
      firstNameLabelControl.Text = rowView["FirstName"].ToString();
    }

    // This event handler binds the value of the LastName field
    // to the LastNameLabel Label control displayed in the template.
    private void LastNameLabel_DataBinding(Object
 sender, EventArgs e)
    {
      // Use the sender parameter to retrieve the Label control
      // being bound to data.
      Label lastNameLabelControl = (Label)sender;

      // Retrieve the value to bind to the Label control. First,
      // use the NamingContainer property to retrieve the parent 
      // control of the Label control. In this example, the parent 
      // control is the FormView control.
      FormView formViewContainer = (FormView)lastNameLabelControl.NamingContainer;

      // Get the data item bound to the FormView control.
      DataRowView rowView = (DataRowView)formViewContainer.DataItem;

      // Use the data item to retrieve the value of the LastName field.
      // Set the Text property of the Label control to this value. 
        
      lastNameLabelControl.Text = rowView["LastName"].ToString();
    }

    // This event handler binds the value of the Title field
    // to the TitleLabel Label control displayed in the template.
    private void TitleLabel_DataBinding(Object
 sender, EventArgs e)
    {
      // Use the sender parameter to retrieve the Label control
      // being bound to data.
      Label titleLabelControl = (Label)sender;

      // Retrieve the value to bind to the Label control. First,
      // use the NamingContainer property to retrieve the parent 
      // control of the Label control. In this example, the parent 
      // control is the FormView control.
      FormView formViewContainer = (FormView)titleLabelControl.NamingContainer;

      // Get the data item bound to the FormView control.
      DataRowView rowView = (DataRowView)formViewContainer.DataItem;

      // Use the data item to retrieve the value of the LastName field
      // Set the Text property of the Label control to this value. 
        
      titleLabelControl.Text = rowView["Title"].ToString();
    }

  }

  void Page_Load(Object sender, EventArgs e)
  {

    // Create a new FormView object.
    FormView employeesFormView = new FormView();

    // Set the FormView object's properties.
    employeesFormView.ID = "EmployeesFormView";
    employeesFormView.DataSourceID = "EmployeeSource";
    employeesFormView.AllowPaging = true;
    employeesFormView.HeaderText = "Employee Name";
    employeesFormView.DataKeyNames = new String[1] { "EmployeeID"
 };

    // Programmatically register the event handler for the 
    // ItemDeleting event of the FormView control.
    employeesFormView.ItemDeleting += new FormViewDeleteEventHandler(EmployeeFormView_ItemDeleting);

    // Create the dynamic template using the custom template class.
    employeesFormView.ItemTemplate = new EmployeeTemplate();

    // Add the FormView object to the Controls collection
    // of the PlaceHolder control.
    FormViewPlaceHolder.Controls.Add(employeesFormView);

  }

  void EmployeeFormView_ItemDeleting(Object sender, FormViewDeleteEventArgs
 e)
  {

    // Use the sender parameter to retrieve the FormView
    // control that raised the event.
    FormView employeeFormView = (FormView)sender;

    // Retrieve the TitleLabel Label control from the
    // data row.
    FormViewRow row = employeeFormView.Row;
    Label titleLabel = (Label)row.FindControl("TitleLabel");

    // Cancel the delete operation if the user attempts to 
    // delete a protected record. In this example, records for
    // employees with a "Sales Manager" job title are protected.
    if (titleLabel.Text.Equals("Sales Manager"))
    {
      e.Cancel = true;
      MessageLabel.Text = "You cannot delete this record.";
    }

  }

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormViewDeleteEventHandler Example</h3>
      
      <!-- Use a PlaceHolder control as the container for the
 -->
      <!-- dynamically generated FormView control.            -->       
      <asp:placeholder id="FormViewPlaceHolder"
        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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title],
 [PhotoPath] From [Employees]"
        deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>
            
    </form>
  </body>
</html>

FormViewDeleteEventHandler デリゲートを、宣言によって FormView コントロールの ItemDeleting 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 EmployeeFormView_ItemDeleting(ByVal sender
 As Object, ByVal e As
 FormViewDeleteEventArgs)
  
    ' Get the employee ID, name, and job title from the Keys and Values
    ' properties.
    Dim keyValue As String
 = e.Keys("EmployeeID").ToString()
    Dim employeeName As String
 = e.Values("FirstName").ToString() & _
      " " & e.Values("LastName").ToString()
    Dim title As String
 = e.Values("Title").ToString()

    ' Cancel the delete operation if the user attempts to 
    ' delete a protected record. In this example, records for
    ' employees with a "Sales Manager" job title are protected.
    If Title.Equals("Sales Manager")
 Then
    
      e.Cancel = True
      MessageLabel.Text = "You cannot delete record "
 & _
        e.RowIndex.ToString() & ". " & employeeName
 & _
        " (Employee Number " & keyValue.ToString()
 & _
        ") is protected."
    
    End If

  End Sub
   
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormViewDeleteEventHandler Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        onitemdeleting="EmployeeFormView_ItemDeleting"
  
        runat="server">
        
        <itemtemplate>
        
          <table>
            <tr>
              <td>
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>'
 
                  runat="server"/>
              </td>
              <td>
                <asp:label id="FirstNameLabel"
                  text='<%#Bind("FirstName")%>'
                  font-bold="true"
                  runat="server"/>
                <asp:label id="LastNameLabel"
                  text='<%#Bind("LastName")%>'
                  font-bold="true"
                  runat="server"/>
                <br/>     
                <asp:label id="TitleLabel"
                  text='<%#Bind("Title")%>'
                  runat="server"/>        
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:button id="DeleteButton"
                  text="Delete Record"
                  commandname="Delete"
                  runat="server" />
              </td>
            </tr>
          </table>
        
        </itemtemplate>         
                  
      </asp:formview>
      
      <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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName],
 [Title], [PhotoPath] From [Employees]"
        deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>
            
    </form>
  </body>
</html>

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

<script runat="server">

  void EmployeeFormView_ItemDeleting(Object sender, FormViewDeleteEventArgs
 e)
  {
    // Get the employee ID, name, and job title from the Keys and Values
    // properties.
    String keyValue = e.Keys["EmployeeID"].ToString();
    String employeeName = e.Values["FirstName"].ToString() +
      " " + e.Values["LastName"].ToString();
    String title = e.Values["Title"].ToString();

    // Cancel the delete operation if the user attempts to 
    // delete a protected record. In this example, records for
    // employees with a "Sales Manager" job title are protected.
    if (title.Equals("Sales Manager"))
    {
      e.Cancel = true;
      MessageLabel.Text = "You cannot delete record " +
        e.RowIndex.ToString() + ". " + employeeName +
        " (Employee Number " + keyValue.ToString() +
        ") is protected.";
    }

  }
   
</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormViewDeleteEventHandler Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        onitemdeleting="EmployeeFormView_ItemDeleting"  
        runat="server">
        
        <itemtemplate>
        
          <table>
            <tr>
              <td>
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td>
                <asp:label id="FirstNameLabel"
                  text='<%#Bind("FirstName")%>'
                  font-bold="true"
                  runat="server"/>
                <asp:label id="LastNameLabel"
                  text='<%#Bind("LastName")%>'
                  font-bold="true"
                  runat="server"/>
                <br/>     
                <asp:label id="TitleLabel"
                  text='<%#Bind("Title")%>'
                  runat="server"/>        
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:button id="DeleteButton"
                  text="Delete Record"
                  commandname="Delete"
                  runat="server" />
              </td>
            </tr>
          </table>
        
        </itemtemplate>         
                  
      </asp:formview>
      
      <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="EmployeeSource"
        selectcommand="Select [EmployeeID], [LastName], [FirstName], [Title],
 [PhotoPath] From [Employees]"
        deletecommand="Delete [Employees] Where [EmployeeID]=@EmployeeID"
        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
FormView クラス
FormView.ItemDeleting イベント
OnItemDeleting
FormView.ItemDeleted イベント
その他の技術情報
イベントとデリゲート

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

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