HyperLinkField Konstruktor
Definition
Viktigt
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Initierar en ny instans av HyperLinkField klassen.
public:
HyperLinkField();public HyperLinkField();Public Sub New ()Exempel
Följande kodexempel visar hur du använder konstruktorn för att dynamiskt lägga till ett HyperLinkField objekt i en GridView kontroll.
<%@ 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 Page_Load(Object sender, EventArgs e)
{
// Dynamically create field columns to display the desired
// fields from the data source. This only needs to be done
// the first time the page is loaded because the GridView
// control persists its column fields.
if (!IsPostBack)
{
// Create a HyperLinkField object to display the company's
// name. Bind the CompanyName and HomePage fields from the
// Northwind database to the caption and URL of the hyperlinks
// in the HyperLinkField field column. Note that the URLs
// specified in the Northwind database might not be valid URLs.
HyperLinkField companyNameBoundField = new HyperLinkField ();
string[] dataNavigateUrlFields = { "HomePage" };
companyNameBoundField.DataTextField = "CompanyName";
companyNameBoundField.DataNavigateUrlFields = dataNavigateUrlFields;
companyNameBoundField.HeaderText = "Company Name";
companyNameBoundField.Target = "_blank";
// Create a BoundField object to display the company's city.
BoundField cityBoundField = new BoundField ();
cityBoundField.DataField = "city";
cityBoundField.HeaderText = "City";
// Add the field columns to the Columns collection of the
// GridView control.
SuppliersGridView.Columns.Add (companyNameBoundField);
SuppliersGridView.Columns.Add (cityBoundField);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>HyperLinkField Constructor Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>HyperLinkField Constructor Example</h3>
<asp:gridview id="SuppliersGridView"
datasourceid="SuppliersSqlDataSource"
autogeneratecolumns="False"
runat="server">
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. -->
<asp:sqldatasource id="SuppliersSqlDataSource"
selectcommand="SELECT [SupplierID], [CompanyName], [City], [HomePage] FROM [Suppliers]"
connectionstring="server=localhost;database=northwind;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 Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' Dynamically create field columns to display the desired
' fields from the data source. This only needs to be done
' the first time the page is loaded because the GridView
' control persists its column fields.
If Not IsPostBack Then
' Create a HyperLinkField object to display the company's
' name. Bind the CompanyName and HomePage fields from the
' Northwind database to the caption and URL of the hyperlinks
' in the HyperLinkField field column. Note that the URLs
' specified in the Northwind database might not be valid URLs.
Dim companyNameBoundField As New HyperLinkField
Dim dataNavigateUrlFields() As String = {"HomePage"}
companyNameBoundField.DataTextField = "CompanyName"
companyNameBoundField.DataNavigateUrlFields = dataNavigateUrlFields
companyNameBoundField.HeaderText = "Company Name"
companyNameBoundField.Target = "_blank"
' Create a BoundField object to display the company's city.
Dim cityBoundField As New BoundField
cityBoundField.DataField = "city"
cityBoundField.HeaderText = "City"
' Add the field columns to the Columns collection of the
' GridView control.
SuppliersGridView.Columns.Add(companyNameBoundField)
SuppliersGridView.Columns.Add(cityBoundField)
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>HyperLinkField Constructor Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>HyperLinkField Constructor Example</h3>
<asp:gridview id="SuppliersGridView"
datasourceid="SuppliersSqlDataSource"
autogeneratecolumns="False"
runat="server">
</asp:gridview>
<!-- This example uses Microsoft SQL Server and connects -->
<!-- to the Northwind sample database. -->
<asp:sqldatasource id="SuppliersSqlDataSource"
selectcommand="SELECT [SupplierID], [CompanyName], [City], [HomePage] FROM [Suppliers]"
connectionstring="server=localhost;database=northwind;integrated security=SSPI"
runat="server">
</asp:sqldatasource>
</form>
</body>
</html>
Kommentarer
Använd den här konstruktorn för att initiera en ny instans av HyperLinkField klassen. Den här konstruktorn används ofta när du lägger till fält i en dynamiskt skapad databunden kontroll.
Om du vill lägga till ett HyperLinkField objekt dynamiskt i en databunden kontroll skapar du ett nytt HyperLinkField objekt, anger dess egenskaper och lägger sedan till det i den databundna kontrollens fältsamling. Om du till exempel använder GridView kontrollen lägger du till objektet HyperLinkField i Columns samlingen.
Note
Även om du dynamiskt kan lägga till fält i en databunden kontroll rekommenderar vi starkt att fälten deklareras statiskt och sedan visas eller döljs efter behov. Om du statiskt deklarerar alla fält minskar storleken på visningstillståndet för den överordnade databundna kontrollen.
