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

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FormViewPageEventHandler 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 PageIndexChanging 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 FormViewPageEventHandler
 ( _
    sender As Object, _
    e As FormViewPageEventArgs _
)

Visual Basic (使用法)

Dim instance As New FormViewPageEventHandler(AddressOf
 HandlerMethod)

public delegate void FormViewPageEventHandler
 (
    Object sender,
    FormViewPageEventArgs e
)

C++

public delegate void FormViewPageEventHandler
 (
    Object^ sender, 
    FormViewPageEventArgs^ e
)

/** @delegate */
public delegate void FormViewPageEventHandler
 (
    Object sender, 
    FormViewPageEventArgs 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 FormViewPageEventArgs。

解説

FormView コントロールは、コントロール内のページャボタン (CommandName プロパティが "Page" に設定されたボタン) がクリックされたときに、FormView コントロールでページング操作を処理する前に PageIndexChanging 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 (ページング操作のキャンセルなど) を実行するイベント処理メソッドを提供できます。

メモ
通常、ページャボタンは、FormView コントロールのページ行に配置されます。

FormViewPageEventHandler 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

FormViewPageEventHandler デリゲートを、プログラムによって FormView コントロールの PageIndexChanging 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
 EmployeeItemTemplate
    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 and LastName 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 nameLineBreak As New
 LiteralControl("<br/>")
      Dim buttonLineBreak As New
 LiteralControl("<br/>")

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

      Dim editButton As New
 Button()
      editButton.ID = "EditButton"
      editButton.CommandName = "Edit"
      editButton.Text = "Edit"

      ' Add the controls to the Controls collection of the 
      ' container control.
      container.Controls.Add(firstNameLabel)
      container.Controls.Add(nameLineBreak)
      container.Controls.Add(lastNameLabel)
      container.Controls.Add(buttonLineBreak)
      container.Controls.Add(editButton)

    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


  End Class
  
  ' This template class represents the edit item
  ' template for a FormView control.
  Private NotInheritable Class
 EmployeeEditItemTemplate
    Implements ITemplate

    Sub InstantiateIn(ByVal container As
 Control) Implements ITemplate.InstantiateIn
      ' Create the child controls contained in the template.
      ' The edit item template should contain the input 
      ' controls for the user to edit a record.
      Dim firstNameTextBox As New
 TextBox()
      firstNameTextBox.ID = "FirstNameTextBox"

      Dim nameLineBreak As New
 LiteralControl("<br/>")
      Dim buttonLineBreak As New
 LiteralControl("<br/>")

      Dim lastNameTextBox As New
 TextBox()
      lastNameTextBox.ID = "LastNameTextBox"

      Dim updateButton As New
 Button()
      updateButton.ID = "UpdateButton"
      updateButton.CommandName = "Update"
      updateButton.Text = "Update"

      Dim cancelButton As New
 Button()
      cancelButton.ID = "CancelButton"
      cancelButton.CommandName = "Cancel"
      cancelButton.Text = "Cancel"

      ' Add the controls to the Controls collection of the 
      ' container control.
      container.Controls.Add(firstNameTextBox)
      container.Controls.Add(nameLineBreak)
      container.Controls.Add(lastNameTextBox)
      container.Controls.Add(buttonLineBreak)
      container.Controls.Add(updateButton)
      container.Controls.Add(cancelButton)

    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 handlers for 
    ' the FormView control.
    AddHandler employeesFormView.PageIndexChanging, AddressOf
 EmployeeFormView_PageIndexChanging
    AddHandler employeesFormView.ModeChanged, AddressOf
 EmployeeFormView_ModeChanged
    AddHandler employeesFormView.ItemUpdating, AddressOf
 EmployeeFormView_ItemUpdating

    ' Create the dynamic templates using the custom template classes.
    employeesFormView.ItemTemplate = New EmployeeItemTemplate()
    employeesFormView.EditItemTemplate = New EmployeeEditItemTemplate()
    ' Add the FormView object to the Controls collection
    ' of the PlaceHolder control.
    FormViewPlaceHolder.Controls.Add(employeesFormView)

  End Sub

  Sub EmployeeFormView_ItemUpdating(ByVal sender
 As Object, ByVal e As
 FormViewUpdateEventArgs)
    
    ' Because the FormView control is dynamically generated, 
    ' the NewValues collection must be programmatically populated
    ' with the values for the record to update.

    ' Use the sender argument to retrieve the FormView
    ' control that raised the event.
    Dim employeeFormView As FormView = CType(sender,
 FormView)
    
    ' Retrieve the data row from the FormView control.
    Dim row As FormViewRow = employeeFormView.Row

    ' Retrieve the TextBox controls that contain the updated values
 
    ' entered by the user. 
    Dim firstNameTextBox As TextBox = CType(row.FindControl("FirstNameTextBox"),
 TextBox)
    Dim lastNameTextBox As TextBox = CType(row.FindControl("LastNameTextBox"),
 TextBox)

    If firstNameTextBox IsNot Nothing And
 lastNameTextBox IsNot Nothing Then
    
      ' Add the new values to the NewValues collections.
      e.NewValues.Add("FirstName", firstNameTextBox.Text)
      e.NewValues.Add("LastName", lastNameTextBox.Text)
      
    End If

  End Sub

  Sub EmployeeFormView_PageIndexChanging(ByVal
 sender As Object, ByVal
 e As FormViewPageEventArgs)
  
    ' Use the sender argument to retrieve the FormView
    ' control that raised the event.
    Dim employeeFormView As FormView = CType(sender,
 FormView)
    
    ' Cancel the paging operation if the FormView control 
    ' is in edit mode.
    If employeeFormView.CurrentMode = FormViewMode.Edit Then
    
      e.Cancel = True
      
      ' Display an error message.
      Dim newPage As Integer
 = e.NewPageIndex + 1
      MessageLabel.Text = "Please update the current record before
 moving to page " & _
        newPage.ToString() & "."
    
    End If
    
  End Sub

  Sub EmployeeFormView_ModeChanged(ByVal sender
 As Object, ByVal e As
 EventArgs)
  
    ' Clear the message label.
    MessageLabel.Text = ""
  
  End Sub

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormView 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]
 From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName,
 [FirstName]=@FirstName 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 EmployeeItemTemplate
 : 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 and LastName 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);

      LiteralControl nameLineBreak = new LiteralControl("<br/>");
      LiteralControl buttonLineBreak = new LiteralControl("<br/>");

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

      Button editButton = new Button();
      editButton.ID = "EditButton";
      editButton.CommandName = "Edit";
      editButton.Text = "Edit";

      // Add the controls to the Controls collection of the 
      // container control.
      container.Controls.Add(firstNameLabel);
      container.Controls.Add(nameLineBreak);
      container.Controls.Add(lastNameLabel);
      container.Controls.Add(buttonLineBreak);
      container.Controls.Add(editButton);

    }

    // 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 template class represents the edit item
  // template for a FormView control.
  private sealed class EmployeeEditItemTemplate
 : ITemplate
  {

    void ITemplate.InstantiateIn(Control container)
    {
      // Create the child controls contained in the template.
      // The edit item template should contain the input 
      // controls for the user to edit a record.
      TextBox firstNameTextBox = new TextBox();
      firstNameTextBox.ID = "FirstNameTextBox";

      LiteralControl nameLineBreak = new LiteralControl("<br/>");
      LiteralControl buttonLineBreak = new LiteralControl("<br/>");

      TextBox lastNameTextBox = new TextBox();
      lastNameTextBox.ID = "LastNameTextBox";

      Button updateButton = new Button();
      updateButton.ID = "UpdateButton";
      updateButton.CommandName = "Update";
      updateButton.Text = "Update";

      Button cancelButton = new Button();
      cancelButton.ID = "CancelButton";
      cancelButton.CommandName = "Cancel";
      cancelButton.Text = "Cancel";

      // Add the controls to the Controls collection of the 
      // container control.
      container.Controls.Add(firstNameTextBox);
      container.Controls.Add(nameLineBreak);
      container.Controls.Add(lastNameTextBox);
      container.Controls.Add(buttonLineBreak);
      container.Controls.Add(updateButton);
      container.Controls.Add(cancelButton);

    }
  }

  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 handlers for 
    // the FormView control.
    employeesFormView.PageIndexChanging += new FormViewPageEventHandler(EmployeeFormView_PageIndexChanging);
    employeesFormView.ModeChanged += new EventHandler(EmployeeFormView_ModeChanged);
    employeesFormView.ItemUpdating += new FormViewUpdateEventHandler(EmployeeFormView_ItemUpdating);

    // Create the dynamic templates using the custom template classes.
    employeesFormView.ItemTemplate = new EmployeeItemTemplate();
    employeesFormView.EditItemTemplate = new EmployeeEditItemTemplate();
    
    // Add the FormView object to the Controls collection
    // of the PlaceHolder control.
    FormViewPlaceHolder.Controls.Add(employeesFormView);

  }

  void EmployeeFormView_ItemUpdating(Object sender, FormViewUpdateEventArgs
 e)
  {
    
    // Because the FormView control is dynamically generated, 
    // the NewValues collection must be programmatically populated
    // with the values for the record to update.

    // Use the sender argument to retrieve the FormView
    // control that raised the event.
    FormView employeeFormView = (FormView)sender;
    
    // Retrieve the data row from the FormView control.
    FormViewRow row = employeeFormView.Row;

    // Retrieve the TextBox controls that contain the updated values
 
    // entered by the user. 
    TextBox firstNameTextBox = (TextBox)row.FindControl("FirstNameTextBox");
    TextBox lastNameTextBox = (TextBox)row.FindControl("LastNameTextBox");

    if (firstNameTextBox != null &&
 lastNameTextBox != null)
    {
      // Add the new values to the NewValues collections.
      e.NewValues.Add("FirstName", firstNameTextBox.Text);
      e.NewValues.Add("LastName", lastNameTextBox.Text);
    }

  }

  void EmployeeFormView_PageIndexChanging(Object sender, FormViewPageEventArgs
 e)
  {
    // Use the sender argument to retrieve the FormView
    // control that raised the event.
    FormView employeeFormView = (FormView)sender;

    // Cancel the paging operation if the FormView control 
    // is in edit mode.
    if (employeeFormView.CurrentMode == FormViewMode.Edit)
    {
      e.Cancel = true;

      // Display an error message.
      int newPage = e.NewPageIndex + 1;
      MessageLabel.Text = "Please update the current record before moving to
 page " +
        newPage.ToString() + ".";
    }
  }

  void EmployeeFormView_ModeChanged(Object sender, EventArgs e)
  {
    // Clear the message label.
    MessageLabel.Text = "";
  }

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormView 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] From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName, [FirstName]=@FirstName
 Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>
            
    </form>
  </body>
</html>

FormViewPageEventHandler デリゲートを、宣言によって FormView コントロールの PageIndexChanging 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_PageIndexChanging(ByVal
 sender As Object, ByVal
 e As FormViewPageEventArgs) Handles EmployeeFormView.PageIndexChanging
  
    ' Cancel the paging operation if the FormView control 
    ' is in edit mode.
    If EmployeeFormView.CurrentMode = FormViewMode.Edit Then
    
      e.Cancel = True
      
      ' Display an error message.
      Dim newPage As Integer
 = e.NewPageIndex + 1
      MessageLabel.Text = "Please update the current record before
 moving to page " & _
        newPage.ToString() & "."
    
    End If
    
  End Sub

  Sub EmployeeFormView_ModeChanged(ByVal sender
 As Object, ByVal e As
 EventArgs) Handles EmployeeFormView.ModeChanged
  
    ' Clear the message label.
    MessageLabel.Text = ""
  
  End Sub

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormViewPageEventArgs Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        emptydatatext="No employees found."
        runat="server">
        
        <itemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>'
 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b>Name:</b>
              </td>
              <td>
                <%# Eval("FirstName") %> <%#
 Eval("LastName") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Title:</b>
              </td>
              <td>
                <%# Eval("Title") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Hire Date:</b>                
 
              </td>
              <td>
                <%# Eval("HireDate","{0:d}")
 %>
              </td>
            </tr>
            <tr height="150" valign="top">
              <td>
                <b>Address:</b>
              </td>
              <td>
                <%# Eval("Address") %><br/>
                <%# Eval("City") %> <%# Eval("Region")
 %>
                <%# Eval("PostalCode") %><br/>
                <%# Eval("Country") %>   
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="Edit"
                  text="Edit"
                  commandname="Edit"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </itemtemplate>
        <edititemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeEditImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>'
 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b>Name:</b>
              </td>
              <td>
                <asp:textbox id="FirstNameUpdateTextBox"
                  text='<%# Bind("FirstName") %>'
                  runat="server"/>
                <asp:textbox id="LastNameUpdateTextBox"
                  text='<%# Bind("LastName") %>'
                  runat="server"/>
              </td>
            </tr>
            <tr>
              <td>
                <b>Title:</b>
              </td>
              <td>
                <asp:textbox id="TitleUpdateTextBox"
                  text='<%# Bind("Title") %>'
                  runat="server"/> 
              </td>
            </tr>
            <tr>
              <td>
                <b>Hire Date:</b>                
 
              </td>
              <td>
                <asp:textbox id="HireDateUpdateTextBox"
                  text='<%# Bind("HireDate", "{0:d}")
 %>'
                  runat="server"/>
              </td>
            </tr>
            <tr height="150" valign="top">
              <td>
                <b>Address:</b>
              </td>
              <td>
                <asp:textbox id="AddressUpdateTextBox"
                  text='<%# Bind("Address") %>'
                  runat="server"/>
                <br/>
                <asp:textbox id="CityUpdateTextBox"
                  text='<%# Bind("City") %>'
                  runat="server"/> 
                <asp:textbox id="RegionUpdateTextBox"
                  text='<%# Bind("Region") %>'
                  width="40"
                  runat="server"/>
                <asp:textbox id="PostalCodeUpdateTextBox"
                  text='<%# Bind("PostalCode") %>'
                  width="60"
                  runat="server"/>
                <br/>
                <asp:textbox id="CountryUpdateTextBox"
                  text='<%# Bind("Country") %>'
                  runat="server"/> 
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="UpdateButton"
                  text="Update"
                  commandname="Update"
                  runat="server"/>
                <asp:linkbutton id="CancelButton"
                  text="Cancel"
                  commandname="Cancel"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </edititemtemplate>
                  
      </asp:formview>
      
      <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], [Address], [City], [Region], [PostalCode], [Country], [HireDate], [PhotoPath]
 From [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName,
 [FirstName]=@FirstName, [Title]=@Title, [Address]=@Address, [City]=@City, [Region]=@Region,
 [PostalCode]=@PostalCode, [Country]=@Country Where [EmployeeID]=@EmployeeID"
        connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
 
        runat="server"/>
            
    </form>
  </body>
</html>

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

<script runat="server">

  void EmployeeFormView_PageIndexChanging(Object sender, FormViewPageEventArgs
 e)
  {
    // Cancel the paging operation if the FormView control 
    // is in edit mode.
    if (EmployeeFormView.CurrentMode == FormViewMode.Edit)
    {
      e.Cancel = true;
      
      // Display an error message.
      int newPage = e.NewPageIndex + 1;
      MessageLabel.Text = "Please update the current record before moving to
 page " + 
        newPage.ToString() + ".";
    }
  }

  void EmployeeFormView_ModeChanged(Object sender, EventArgs e)
  {
    // Clear the message label.
    MessageLabel.Text = "";
  }

</script>

<html>
  <body>
    <form runat="server">
        
      <h3>FormViewPageEventArgs Example</h3>
                       
      <asp:formview id="EmployeeFormView"
        datasourceid="EmployeeSource"
        allowpaging="true"
        datakeynames="EmployeeID"
        emptydatatext="No employees found."
        onpageindexchanging="EmployeeFormView_PageIndexChanging" 
        onmodechanged="EmployeeFormView_ModeChanged"  
        runat="server">
        
        <itemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b>Name:</b>
              </td>
              <td>
                <%# Eval("FirstName") %> <%# Eval("LastName")
 %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Title:</b>
              </td>
              <td>
                <%# Eval("Title") %>
              </td>
            </tr>
            <tr>
              <td>
                <b>Hire Date:</b>                 
              </td>
              <td>
                <%# Eval("HireDate","{0:d}") %>
              </td>
            </tr>
            <tr height="150" valign="top">
              <td>
                <b>Address:</b>
              </td>
              <td>
                <%# Eval("Address") %><br/>
                <%# Eval("City") %> <%# Eval("Region")
 %>
                <%# Eval("PostalCode") %><br/>
                <%# Eval("Country") %>   
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="Edit"
                  text="Edit"
                  commandname="Edit"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </itemtemplate>
        <edititemtemplate>
          <table>
            <tr>
              <td rowspan="6">
                <asp:image id="EmployeeEditImage"
                  imageurl='<%# Eval("PhotoPath") %>'
                  alternatetext='<%# Eval("LastName") %>' 
                  runat="server"/>
              </td>
              <td colspan="2">
                  &nbsp; 
              </td>
            </tr>
            <tr>
              <td>
                <b>Name:</b>
              </td>
              <td>
                <asp:textbox id="FirstNameUpdateTextBox"
                  text='<%# Bind("FirstName") %>'
                  runat="server"/>
                <asp:textbox id="LastNameUpdateTextBox"
                  text='<%# Bind("LastName") %>'
                  runat="server"/>
              </td>
            </tr>
            <tr>
              <td>
                <b>Title:</b>
              </td>
              <td>
                <asp:textbox id="TitleUpdateTextBox"
                  text='<%# Bind("Title") %>'
                  runat="server"/> 
              </td>
            </tr>
            <tr>
              <td>
                <b>Hire Date:</b>                 
              </td>
              <td>
                <asp:textbox id="HireDateUpdateTextBox"
                  text='<%# Bind("HireDate", "{0:d}") %>'
                  runat="server"/>
              </td>
            </tr>
            <tr height="150" valign="top">
              <td>
                <b>Address:</b>
              </td>
              <td>
                <asp:textbox id="AddressUpdateTextBox"
                  text='<%# Bind("Address") %>'
                  runat="server"/>
                <br/>
                <asp:textbox id="CityUpdateTextBox"
                  text='<%# Bind("City") %>'
                  runat="server"/> 
                <asp:textbox id="RegionUpdateTextBox"
                  text='<%# Bind("Region") %>'
                  width="40"
                  runat="server"/>
                <asp:textbox id="PostalCodeUpdateTextBox"
                  text='<%# Bind("PostalCode") %>'
                  width="60"
                  runat="server"/>
                <br/>
                <asp:textbox id="CountryUpdateTextBox"
                  text='<%# Bind("Country") %>'
                  runat="server"/> 
              </td>
            </tr>
            <tr>
              <td colspan="2">
                <asp:linkbutton id="UpdateButton"
                  text="Update"
                  commandname="Update"
                  runat="server"/>
                <asp:linkbutton id="CancelButton"
                  text="Cancel"
                  commandname="Cancel"
                  runat="server"/> 
              </td>
            </tr>
          </table>       
        </edititemtemplate>
                  
      </asp:formview>
      
      <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],
 [Address], [City], [Region], [PostalCode], [Country], [HireDate], [PhotoPath] From
 [Employees]"
        updatecommand="Update [Employees] Set [LastName]=@LastName, [FirstName]=@FirstName,
 [Title]=@Title, [Address]=@Address, [City]=@City, [Region]=@Region, [PostalCode]=@PostalCode,
 [Country]=@Country 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
FormViewPageEventArgs クラス
FormView.PageIndexChanging イベント
OnPageIndexChanging
その他の技術情報
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