GridViewRowCollection.Count Egenskap
Definition
Viktigt
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Hämtar antalet objekt i objektet GridViewRowCollection .
public:
property int Count { int get(); };public int Count { get; }member this.Count : intPublic ReadOnly Property Count As IntegerEgenskapsvärde
Antalet objekt i GridViewRowCollection objektet.
Implementeringar
Exempel
I följande exempel visas hur du använder Count egenskapen för att avgöra om GridView kontrollen innehåller några poster. Ett värde som är större än noll anger att GridView kontrollen innehåller minst en post.
<%@ 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)
{
// Get the number of items in the Rows collection.
int count = AuthorsGridView.Rows.Count;
// If the GridView control contains any records, display
// the last name of each author in the GridView control.
if (count > 0)
{
Message.Text = "The authors are:<br />";
foreach (GridViewRow row in AuthorsGridView.Rows)
{
Message.Text += row.Cells[0].Text + "<br />";
}
}
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewRowCollection Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewRowCollection 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
' Get the number of items in the Rows collection.
Dim count As Integer = AuthorsGridView.Rows.Count
' If the GridView control contains any records, display
' the last name of each author in the GridView control.
If count > 0 Then
Message.Text = "The authors are:<br />"
Dim row As GridViewRow
For Each row In AuthorsGridView.Rows
Message.Text &= row.Cells(0).Text & "<br />"
Next
End If
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>GridViewRowCollection Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>GridViewRowCollection 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>
Kommentarer
Använd egenskapen Count för att fastställa antalet objekt i samlingen. Egenskapen Count används ofta när du itererar genom samlingen för att fastställa samlingens övre gräns. Egenskapen Count används också ofta för att avgöra om en samling är tom.
