GridViewRowCollection.GetEnumerator Metode
Definisi
Penting
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Mengembalikan enumerator yang berisi semua GridViewRow objek dalam GridViewRowCollection.
public:
virtual System::Collections::IEnumerator ^ GetEnumerator();public System.Collections.IEnumerator GetEnumerator();abstract member GetEnumerator : unit -> System.Collections.IEnumerator
override this.GetEnumerator : unit -> System.Collections.IEnumeratorPublic Function GetEnumerator () As IEnumeratorMengembalikan
Objek IEnumerator yang diimplementasikan yang berisi semua GridViewRow objek di GridViewRowCollection.
Penerapan
Contoh
Contoh berikut menunjukkan cara menggunakan GetEnumerator metode untuk mengambil enumerator yang berisi nilai dari koleksi. Enumerator diulang dan nilai sel pertama ditampilkan di halaman.
<%@ 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 AuthorsGridView_RowCreated(Object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.Footer)
{
Message.Text = "The authors are:<br />";
// Get the enumerator that contains the data rows in the
// GridView control.
IEnumerator rowEnumerator = AuthorsGridView.Rows.GetEnumerator();
// Iterate though the enumerator and display the value in the
// first cell of the row.
while(rowEnumerator.MoveNext())
{
GridViewRow row = (GridViewRow)rowEnumerator.Current;
Message.Text += row.Cells[0].Text + "<br />";
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewRowCollection GetEnumerator Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewRowCollection GetEnumerator Example</h3>
<table>
<tr>
<td>
<asp:gridview id="AuthorsGridView"
datasourceid="AuthorsSqlDataSource"
autogeneratecolumns="false"
onrowcreated="AuthorsGridView_RowCreated"
runat="server">
<columns>
<asp:boundfield datafield="au_lname"
headertext="Last Name"/>
<asp:boundfield datafield="au_fname"
headertext="First Name"/>
</columns>
</asp:gridview>
</td>
<td>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
</td>
</tr>
</table>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_lname], [au_fname] FROM [authors] WHERE [state]='CA'"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</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 AuthorsGridView_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
If e.Row.RowType = DataControlRowType.Footer Then
Message.Text = "The authors are:<br />"
' Get the enumerator that contains the data rows in the
' GridView control.
Dim rowEnumerator As IEnumerator = AuthorsGridView.Rows.GetEnumerator()
' Iterate though the enumerator and display the value in the
' first cell of the row.
While rowEnumerator.MoveNext()
Dim row As GridViewRow = CType(rowEnumerator.Current, GridViewRow)
Message.Text &= row.Cells(0).Text & "<br />"
End While
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewRowCollection GetEnumerator Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewRowCollection GetEnumerator Example</h3>
<table>
<tr>
<td>
<asp:gridview id="AuthorsGridView"
datasourceid="AuthorsSqlDataSource"
autogeneratecolumns="false"
onrowcreated="AuthorsGridView_RowCreated"
runat="server">
<columns>
<asp:boundfield datafield="au_lname"
headertext="Last Name"/>
<asp:boundfield datafield="au_fname"
headertext="First Name"/>
</columns>
</asp:gridview>
</td>
<td>
<asp:label id="Message"
forecolor="Red"
runat="server"/>
</td>
</tr>
</table>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Pubs sample database. -->
<asp:sqldatasource id="AuthorsSqlDataSource"
selectcommand="SELECT [au_lname], [au_fname] FROM [authors] WHERE [state]='CA'"
connectionstring="server=localhost;database=pubs;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Keterangan
Gunakan metode ini untuk mendapatkan enumerator yang dapat diulang melalui linier untuk mengakses setiap item di GridViewRowCollection. Untuk mengakses item pada posisi saat ini di enumerator, gunakan IEnumerator.Current properti . IEnumerator.MoveNext Gunakan metode untuk berpindah ke item berikutnya dalam koleksi. Untuk memindahkan enumerator ke posisi awalnya, gunakan IEnumerator.Reset metode .
Nota
Ketika Anda awalnya mendapatkan enumerator atau menggunakan IEnumerator.Reset metode untuk memindahkan enumerator ke item pertama dalam koleksi, Anda harus memanggil IEnumerator.MoveNext metode . Jika tidak, item yang diwakili oleh IEnumerator.Current properti tidak terdefinisi.
