HyperLinkField Costruttore
Definizione
Importante
Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.
Inizializza una nuova istanza della classe HyperLinkField.
public:
HyperLinkField();public HyperLinkField ();Public Sub New ()Esempio
Nell'esempio di codice seguente viene illustrato come usare il costruttore per aggiungere dinamicamente un oggetto a un HyperLinkFieldGridView controllo.
<%@ 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>
Commenti
Usare questo costruttore per inizializzare una nuova istanza della HyperLinkField classe. Questo costruttore viene comunemente usato quando si aggiungono campi a un controllo associato a dati creato dinamicamente.
Per aggiungere dinamicamente un oggetto a un HyperLinkField controllo associato a dati, creare un nuovo HyperLinkField oggetto, impostarne le proprietà e quindi aggiungerlo all'insieme di campi associato ai dati. Ad esempio, se si usa il controllo, aggiungere l'oggetto GridViewHyperLinkField all'insieme Columns .
Nota
Anche se è possibile aggiungere dinamicamente campi a un controllo associato a dati, è consigliabile dichiarare staticamente i campi e quindi visualizzati o nascosti, come appropriato. Dichiarando staticamente tutti i campi riduce le dimensioni dello stato di visualizzazione per il controllo associato ai dati padre.
