DetailsViewRowCollection.GetEnumerator Metode
Definisi
Penting
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Mengembalikan enumerator yang berisi semua DetailsViewRow objek dalam DetailsViewRowCollection objek.
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 IEnumeratoryang diimplementasikan yang berisi semua DetailsViewRow objek dalam DetailsViewRowCollection.
Penerapan
Contoh
Contoh kode berikut menunjukkan cara menggunakan GetEnumerator metode untuk mengambil enumerator yang berisi item dari koleksi. Enumerator kemudian diulang dan nilai setiap baris 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 SubmitButton_Click(Object sender, EventArgs e)
{
// Use the Count property to determine whether the
// Rows collection contains any item.
if (ItemDetailsView.Rows.Count > 0)
{
MessageLabel.Text = "The row values are: <br/><br/>";
// Get the enumerator that contains the data rows in the
// DetailsView control.
IEnumerator rowEnumerator = ItemDetailsView.Rows.GetEnumerator();
// Iterate though the enumerator and display the field values.
while (rowEnumerator.MoveNext())
{
DetailsViewRow row = (DetailsViewRow)rowEnumerator.Current;
// Use the Text property to access the value of
// each cell. In this example, the cells in the
// first column (index 0) contains the field names,
// while the cells in the second column (index 1)
// contains the field value.
MessageLabel.Text += row.Cells[0].Text + " = " +
row.Cells[1].Text + "<br/>";
}
}
else
{
MessageLabel.Text = "No items.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewRowCollection GetEnumerator Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewRowCollection GetEnumerator Example</h3>
<asp:detailsview id="ItemDetailsView"
datasourceid="DetailsViewSource"
allowpaging="true"
autogeneraterows="false"
runat="server">
<fields>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"/>
<asp:boundfield datafield="CompanyName"
headertext="Company Name"/>
<asp:boundfield datafield="Address"
headertext="Address"/>
<asp:boundfield datafield="City"
headertext="City"/>
<asp:boundfield datafield="PostalCode"
headertext="ZIP Code"/>
<asp:boundfield datafield="Country"
headertext="Country"/>
</fields>
</asp:detailsview>
<br/>
<asp:button id="SubmitButton"
text="Display Row Values"
onclick="SubmitButton_Click"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</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 SubmitButton_Click(ByVal sender As Object, ByVal e As EventArgs)
' Use the Count property to determine whether the
' Rows collection contains any item.
If ItemDetailsView.Rows.Count > 0 Then
MessageLabel.Text = "The row values are: <br/><br/>"
' Get the enumerator that contains the data rows in the
' DetailsView control.
Dim rowEnumerator As IEnumerator = ItemDetailsView.Rows.GetEnumerator()
' Iterate though the enumerator and display the field values.
While rowEnumerator.MoveNext()
Dim row As DetailsViewRow = CType(rowEnumerator.Current, DetailsViewRow)
' Use the Text property to access the value of
' each cell. In this example, the cells in the
' first column (index 0) contains the field names,
' while the cells in the second column (index 1)
' contains the field value.
MessageLabel.Text &= row.Cells(0).Text & " = " & _
row.Cells(1).Text & "<br/>"
End While
Else
MessageLabel.Text = "No items."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DetailsViewRowCollection GetEnumerator Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DetailsViewRowCollection GetEnumerator Example</h3>
<asp:detailsview id="ItemDetailsView"
datasourceid="DetailsViewSource"
allowpaging="true"
autogeneraterows="false"
runat="server">
<fields>
<asp:boundfield datafield="CustomerID"
headertext="Customer ID"/>
<asp:boundfield datafield="CompanyName"
headertext="Company Name"/>
<asp:boundfield datafield="Address"
headertext="Address"/>
<asp:boundfield datafield="City"
headertext="City"/>
<asp:boundfield datafield="PostalCode"
headertext="ZIP Code"/>
<asp:boundfield datafield="Country"
headertext="Country"/>
</fields>
</asp:detailsview>
<br/>
<asp:button id="SubmitButton"
text="Display Row Values"
onclick="SubmitButton_Click"
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="DetailsViewSource"
selectcommand="Select [CustomerID], [CompanyName], [Address],
[City], [PostalCode], [Country] From [Customers]"
connectionstring=
"<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Keterangan
Gunakan metode ini untuk mendapatkan enumerator yang dapat diulang melalui linier untuk mengakses setiap item dalam DetailsViewRowCollection objek. Untuk mengakses item pada posisi saat ini di enumerator, gunakan Current properti . MoveNext Gunakan metode untuk berpindah ke item berikutnya dalam koleksi. Untuk memindahkan enumerator ke posisi awalnya, gunakan Reset metode .
Nota
Ketika Anda awalnya mendapatkan enumerator atau menggunakan Reset metode untuk memindahkan enumerator ke item pertama dalam koleksi, Anda harus memanggil MoveNext metode . Jika tidak, item yang diwakili oleh Current properti tidak terdefinisi.
