HyperLinkField Construtor
Definição
Importante
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Inicializa uma nova instância da classe HyperLinkField.
public:
HyperLinkField();public HyperLinkField ();Public Sub New ()Exemplos
O exemplo de código a seguir demonstra como usar o construtor para adicionar dinamicamente um HyperLinkField objeto a um GridView controle.
<%@ 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>
Comentários
Use este construtor para inicializar uma nova instância da HyperLinkField classe. Esse construtor é comumente usado ao adicionar campos a um controle associado a dados criado dinamicamente.
Para adicionar dinamicamente um HyperLinkField objeto a um controle associado a dados, crie um novo HyperLinkField objeto, defina suas propriedades e adicione-o à coleção de campos do controle associado a dados. Por exemplo, se você estiver usando o GridView controle, adicione o HyperLinkField objeto à Columns coleção.
Observação
Embora você possa adicionar dinamicamente campos a um controle associado a dados, é altamente recomendável que os campos sejam declarados estaticamente e, em seguida, mostrados ou ocultos, conforme apropriado. Declarar estaticamente todos os campos reduz o tamanho do estado de exibição para o controle associado a dados pai.