DetailsView.PageIndexChanging Kejadian
Definisi
Penting
Beberapa informasi terkait produk prarilis yang dapat diubah secara signifikan sebelum dirilis. Microsoft tidak memberikan jaminan, tersirat maupun tersurat, sehubungan dengan informasi yang diberikan di sini.
Terjadi ketika nilai PageIndex properti berubah sebelum operasi paging.
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 Jenis Acara
Contoh
Contoh kode berikut menunjukkan cara menggunakan PageIndexChanging peristiwa untuk membatalkan operasi paging.
<%@ 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>
Keterangan
DetailsView Kontrol menaikkan PageIndexChanging peristiwa ketika tombol pager (tombol dengan propertinya CommandName diatur ke "Halaman") dalam kontrol diklik, tetapi sebelum DetailsView kontrol menangani operasi penomor. Hal ini memungkinkan Anda untuk menyediakan penanganan aktivitas yang melakukan rutinitas kustom, seperti membatalkan operasi paging, setiap kali peristiwa ini terjadi.
Catatan
Kejadian ini tidak dinaikkan ketika Anda mengatur PageIndex properti secara terprogram.
Tombol pager biasanya terletak di baris DetailsView pager kontrol.
Objek DetailsViewPageEventArgs diteruskan ke penanganan aktivitas, yang memungkinkan Anda menentukan indeks halaman yang dipilih oleh pengguna dan untuk menunjukkan bahwa operasi paging harus dibatalkan. Untuk menentukan indeks halaman yang dipilih oleh pengguna, gunakan NewPageIndex properti . Untuk membatalkan operasi paging, atur Cancel properti objek ke DetailsViewPageEventArgstrue.
Untuk informasi selengkapnya tentang cara menangani peristiwa, lihat Menangani dan Menaikkan Peristiwa.
