DataKeyArray.Count Properti
Definisi
Penting
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Mendapatkan jumlah item dalam koleksi.
public:
property int Count { int get(); };public int Count { get; }member this.Count : intPublic ReadOnly Property Count As IntegerNilai Properti
Jumlah item dalam koleksi.
Penerapan
Contoh
Contoh kode berikut menunjukkan cara menggunakan Count properti untuk menentukan apakah DataKeyArray koleksi kosong.
<%@ 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 CustomerGridView_DataBound(Object sender, EventArgs e)
{
// Use the Count property to determine whether the
// DataKeys collection contains any items.
if (CustomerGridView.DataKeys.Count > 0)
{
MessageLabel.Text = "The primary key of each record displayed are: <br/><br/>";
// Use the GetEnumerator method to create an enumerator that
// contains the DataKey objects for the GridView control.
IEnumerator keyEnumerator = CustomerGridView.DataKeys.GetEnumerator();
// Iterate though the enumerator and display the primary key
// value of each record displayed.
while (keyEnumerator.MoveNext())
{
DataKey key = (DataKey)keyEnumerator.Current;
MessageLabel.Text += key.Value.ToString() + "<br/>";
}
}
else
{
MessageLabel.Text = "No DataKey objects.";
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataKeyArray Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataKeyArray Example</h3>
<asp:gridview id="CustomerGridView"
datasourceid="CustomerDataSource"
autogeneratecolumns="true"
datakeynames="CustomerID"
allowpaging="true"
ondatabound="CustomerGridView_DataBound"
runat="server">
</asp:gridview>
<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="CustomerDataSource"
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 CustomerGridView_DataBound(ByVal sender As Object, ByVal e As EventArgs) Handles CustomerGridView.DataBound
' Use the Count property to determine whether the
' DataKeys collection contains any items.
If CustomerGridView.DataKeys.Count > 0 Then
MessageLabel.Text = "The primary key of each record displayed are: <br/><br/>"
' Use the GetEnumerator method to create an enumerator that
' contains the DataKey objects for the GridView control.
Dim keyEnumerator As IEnumerator = CustomerGridView.DataKeys.GetEnumerator()
' Iterate though the enumerator and display the primary key
' value of each record displayed.
While keyEnumerator.MoveNext()
Dim key As DataKey = CType(keyEnumerator.Current, DataKey)
MessageLabel.Text &= key.Value.ToString() & "<br/>"
End While
Else
MessageLabel.Text = "No DataKey objects."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>DataKeyArray Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>DataKeyArray Example</h3>
<asp:gridview id="CustomerGridView"
datasourceid="CustomerDataSource"
autogeneratecolumns="true"
datakeynames="CustomerID"
allowpaging="true"
runat="server">
</asp:gridview>
<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="CustomerDataSource"
selectcommand="Select [CustomerID], [CompanyName], [Address], [City], [PostalCode], [Country] From [Customers]"
connectionstring="<%$ ConnectionStrings:NorthWindConnectionString%>"
runat="server"/>
</form>
</body>
</html>
Keterangan
Count Gunakan properti untuk menentukan jumlah item dalam koleksi. Properti Count ini umumnya digunakan saat melakukan iterasi melalui koleksi untuk menentukan batas atasnya. Properti Count ini juga umumnya digunakan untuk menentukan apakah koleksi kosong.
