GridViewRowCollection.Count 属性
定义
重要
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获取 GridViewRowCollection 对象中的项数。
public:
property int Count { int get(); };public int Count { get; }member this.Count : intPublic ReadOnly Property Count As Integer属性值
GridViewRowCollection 对象中的项数。
实现
示例
下面的示例演示如何使用 Count 属性来确定控件是否 GridView 包含任何记录。 大于零的值指示 GridView 控件至少包含一条记录。
<%@ 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>
注解
使用 Count 属性确定集合中的项数。 在 Count 循环访问集合以确定集合的上限时，通常使用该属性。 该 Count 属性还通常用于确定集合是否为空。