DetailsView.PageIndexChanging DetailsView.PageIndexChanging DetailsView.PageIndexChanging DetailsView.PageIndexChanging Event

Определение

Происходит, если значение свойства PageIndex изменяется перед выполнением операции разбиения по страницам.Occurs when the value of the PageIndex property changes before a paging operation.

public:
 event System::Web::UI::WebControls::DetailsViewPageEventHandler ^ PageIndexChanging;
public event System.Web.UI.WebControls.DetailsViewPageEventHandler PageIndexChanging;
member this.PageIndexChanging : System.Web.UI.WebControls.DetailsViewPageEventHandler 
Public Custom Event PageIndexChanging As DetailsViewPageEventHandler 

Примеры

В следующем примере кода показано, как использовать PageIndexChanging событие для отмены операции разбиения на страницы.The following code example demonstrates how to use the PageIndexChanging event to cancel a paging operation.


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

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">


    void CustomerDetailView_ItemCommand(Object sender, 
      DetailsViewCommandEventArgs e)
    {
        // Clear the error message if the user cancels the edit 
        // operation.
        if (e.CommandName == "Cancel")
        {
            ErrorMessageLabel.Text = "";
        }
    }

    protected void CustomerDetailView_PageIndexChanging(
      object sender, DetailsViewPageEventArgs e)
    {
        // Cancel the paging operation if the user tries to 
        // navigate to another record while in edit mode.
        if (CustomerDetailView.CurrentMode == DetailsViewMode.Edit)
        {
            e.Cancel = true;
            // Display an error message.
            ErrorMessageLabel.Text = 
              "You cannot navigate to another record while in edit mode.";
        }

    }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView CurrentMode Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView CurrentMode Example</h3>
        <asp:DetailsView ID="CustomerDetailView" 
          DataSourceID="DetailsViewSource" 
          AutoGenerateRows="true"
          AutoGenerateEditButton="true" 
          DataKeyNames="CustomerID" 
          GridLines="Both" 
          AllowPaging="true"
          OnItemCommand="CustomerDetailView_ItemCommand" 
          runat="server" 
          OnPageIndexChanging="CustomerDetailView_PageIndexChanging">
          
          <HeaderStyle BackColor="Navy" ForeColor="White" />
        </asp:DetailsView>
        
        <br />
        
        <asp:Label ID="ErrorMessageLabel" 
          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="DetailsViewSource" runat="server" 
          ConnectionString=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
          InsertCommand="INSERT INTO [Customers]([CustomerID],
            [CompanyName], [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"
          SelectCommand="Select [CustomerID], [CompanyName], 
            [Address], [City], [PostalCode], [Country] From 
            [Customers]">
        </asp:SqlDataSource>
    </form>
</body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">


    Sub CustomerDetailView_ItemCommand(ByVal sender As Object, _
      ByVal e As DetailsViewCommandEventArgs)
        ' Clear the error message if the user cancels the edit 
        ' operation.
        If e.CommandName = "Cancel" Then
            ErrorMessageLabel.Text = ""
        End If
    End Sub

    Protected Sub CustomerDetailView_PageIndexChanging( _
    ByVal sender As Object, ByVal e As DetailsViewPageEventArgs)
        ' Cancel the paging operation if the user tries to navigate 
        ' to another record while in edit mode.
        If CustomerDetailView.CurrentMode = DetailsViewMode.Edit Then
            e.Cancel = True
            ' Display an error message.
            ErrorMessageLabel.Text = _
                "You cannot navigate to another record while in edit mode."
        End If
    End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>
            DetailsView CurrentMode Example</title>
</head>
<body>
    <form id="Form1" runat="server">
        <h3>
            DetailsView CurrentMode Example</h3>
        <asp:DetailsView ID="CustomerDetailView" 
          DataSourceID="DetailsViewSource" 
          AutoGenerateRows="true"
          AutoGenerateEditButton="true" 
          DataKeyNames="CustomerID" 
          GridLines="Both" 
          AllowPaging="true"
          OnItemCommand="CustomerDetailView_ItemCommand" 
          runat="server" 
          OnPageIndexChanging="CustomerDetailView_PageIndexChanging">
          
          <HeaderStyle BackColor="Navy" ForeColor="White" />
        </asp:DetailsView>
        
        <br />
        
        <asp:Label ID="ErrorMessageLabel" 
          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="DetailsViewSource" runat="server" 
          ConnectionString=
            "<%$ ConnectionStrings:NorthWindConnectionString%>"
          InsertCommand="INSERT INTO [Customers]([CustomerID],
            [CompanyName], [Address], [City], [PostalCode], [Country]) 
            VALUES (@CustomerID, @CompanyName, @Address, @City, 
            @PostalCode, @Country)"

          SelectCommand="Select [CustomerID], [CompanyName], 
            [Address], [City], [PostalCode], [Country] From 
            [Customers]">
        </asp:SqlDataSource>
    </form>
</body>
</html>

Комментарии

Элемент управления CommandName вызывает событие при нажатии кнопки страничного навигатора (кнопки со свойством, равным "страница") в DetailsView элементе управления, но до того, как элемент управления обрабатывает операцию разбиения по страницам. PageIndexChanging DetailsViewThe DetailsView control raises the PageIndexChanging event when a pager button (a button with its CommandName property set to "Page") within the control is clicked, but before the DetailsView control handles the paging operation. Это позволяет предоставить обработчик событий, выполняющий пользовательскую подпрограммы, например отмену операции разбиения по страницам, при возникновении этого события.This allows you to provide an event handler that performs a custom routine, such as canceling the paging operation, whenever this event occurs.

Примечание

Это событие не возникает при программном задании PageIndex свойства.This event is not raised when you programmatically set the PageIndex property.

Кнопки страничного навигатора обычно находятся в строке DetailsView страницы элемента управления.Pager buttons are usually located in the pager row of a DetailsView control.

DetailsViewPageEventArgs Объект передается обработчику событий, который позволяет определить индекс страницы, выбранной пользователем, и указать, что операция разбиения по страницам должна быть отменена.A DetailsViewPageEventArgs object is passed to the event handler, which allows you to determine the index of the page selected by the user and to indicate that the paging operation should be canceled. Чтобы определить индекс страницы, выбранной пользователем, используйте NewPageIndex свойство.To determine the index of the page selected by the user, use the NewPageIndex property. Чтобы отменить операцию разбиения по страницам Cancel , присвойте DetailsViewPageEventArgs свойству trueобъекта значение.To cancel the paging operation, set the Cancel property of the DetailsViewPageEventArgs object to true.

Дополнительные сведения об обработке событий см. в разделе обработка и вызов событий.For more information about how to handle events, see Handling and Raising Events.

Применяется к

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