ObjectDataSourceView.UpdateParameters Propriedade
Definição
Importante
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Obtém a coleção de parâmetros que contém os parâmetros usados pelo método UpdateMethod.
public:
property System::Web::UI::WebControls::ParameterCollection ^ UpdateParameters { System::Web::UI::WebControls::ParameterCollection ^ get(); };public System.Web.UI.WebControls.ParameterCollection UpdateParameters { get; }member this.UpdateParameters : System.Web.UI.WebControls.ParameterCollectionPublic ReadOnly Property UpdateParameters As ParameterCollectionValor da propriedade
Um ParameterCollection que contém os parâmetros usados pela propriedade UpdateMethod.
Exemplos
O exemplo de código a seguir demonstra como usar um DropDownList controle, TextBox controles e vários controles ObjectDataSource para atualizar dados. O DropDownList exibe o nome de um NorthwindEmployee, enquanto os TextBox controles são usados para inserir e atualizar informações de endereço. Como a UpdateParameters coleção contém um ControlParameter objeto que está associado ao valor selecionado do DropDownList, o botão que dispara a Update operação só é habilitado depois que um funcionário é selecionado.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS" Assembly="Samples.AspNet.CS" %>
<%@ Page language="c#" %>
<%@ Import namespace="Samples.AspNet.CS" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
// Add parameters and initialize the user interface
// only if an employee is selected.
private void Page_Load(object sender, EventArgs e)
{
// Be sure the text boxes are initialized with
// data from the currently selected employee.
NorthwindEmployee selectedEmployee = EmployeeLogic.GetEmployee(DropDownList1.SelectedValue);
if (selectedEmployee != null) {
AddressBox.Text = selectedEmployee.Address;
CityBox.Text = selectedEmployee.City;
PostalCodeBox.Text = selectedEmployee.PostalCode;
Button1.Enabled = true;
}
else {
Button1.Enabled = false;
}
}
// Press the button to update.
private void Btn_UpdateEmployee (object sender, CommandEventArgs e) {
ObjectDataSource2.Update();
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>ObjectDataSource - C# Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<!-- The DropDownList is bound to the first ObjectDataSource. -->
<asp:objectdatasource
id="ObjectDataSource1"
runat="server"
selectmethod="GetAllEmployees"
typename="Samples.AspNet.CS.EmployeeLogic" />
<p><asp:dropdownlist
id="DropDownList1"
runat="server"
datasourceid="ObjectDataSource1"
datatextfield="FullName"
datavaluefield="EmpID"
autopostback="True" /></p>
<!-- The second ObjectDataSource performs the Update. This
preserves the state of the DropDownList, which otherwise
would rebind when the DataSourceChanged event is
raised as a result of an Update operation. -->
<!-- Security Note: The ObjectDataSource uses a FormParameter,
Security Note: which does not perform validation of input from the client.
Security Note: To validate the value of the FormParameter,
Security Note: handle the Updating event. -->
<asp:objectdatasource
id="ObjectDataSource2"
runat="server"
updatemethod="UpdateEmployeeWrapper"
typename="Samples.AspNet.CS.EmployeeLogic">
<updateparameters>
<asp:controlparameter name="anID" controlid="DropDownList1" propertyname="SelectedValue" />
<asp:formparameter name="anAddress" formfield="AddressBox" />
<asp:formparameter name="aCity" formfield="CityBox" />
<asp:formparameter name="aPostalCode" formfield="PostalCodeBox" />
</updateparameters>
</asp:objectdatasource>
<p><asp:textbox
id="AddressBox"
runat="server" /></p>
<p><asp:textbox
id="CityBox"
runat="server" /></p>
<p><asp:textbox
id="PostalCodeBox"
runat="server" /></p>
<asp:button
id="Button1"
runat="server"
text="Update Employee"
oncommand="Btn_UpdateEmployee" />
</form>
</body>
</html>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB" Assembly="Samples.AspNet.VB" %>
<%@ Page language="vb" %>
<%@ Import namespace="Samples.AspNet.VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
' Add parameters and initialize the user interface
' only if an employee is selected.
Private Sub Page_Load(sender As Object, e As EventArgs)
' Be sure the text boxes are initialized with
' data from the currently selected employee.
Dim selectedEmployee As NorthwindEmployee
selectedEmployee = EmployeeLogic.GetEmployee(DropDownList1.SelectedValue)
If Not selectedEmployee Is Nothing Then
AddressBox.Text = selectedEmployee.Address
CityBox.Text = selectedEmployee.City
PostalCodeBox.Text = selectedEmployee.PostalCode
Button1.Enabled = True
Else
Button1.Enabled = False
End If
End Sub ' Page_Load
' Press the button to update.
Private Sub Btn_UpdateEmployee (sender As Object, e As CommandEventArgs )
ObjectDataSource2.Update()
End Sub ' Btn_UpdateEmployee
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>ObjectDataSource - VB Example</title>
</head>
<body>
<form id="Form1" method="post" runat="server">
<!-- The DropDownList is bound to the first ObjectDataSource. -->
<asp:objectdatasource
id="ObjectDataSource1"
runat="server"
selectmethod="GetAllEmployees"
typename="Samples.AspNet.VB.EmployeeLogic" />
<p><asp:dropdownlist
id="DropDownList1"
runat="server"
datasourceid="ObjectDataSource1"
datatextfield="FullName"
datavaluefield="EmpID"
autopostback="True" /></p>
<!-- The second ObjectDataSource performs the Update. This
preserves the state of the DropDownList, which otherwise
would rebind when the DataSourceChanged event is
raised as a result of an Update operation. -->
<!-- Security Note: The ObjectDataSource uses a FormParameter,
Security Note: which does not perform validation of input from the client.
Security Note: To validate the value of the FormParameter,
Security Note: handle the Updating event. -->
<asp:objectdatasource
id="ObjectDataSource2"
runat="server"
updatemethod="UpdateEmployeeWrapper"
typename="Samples.AspNet.VB.EmployeeLogic">
<updateparameters>
<asp:controlparameter name="anID" controlid="DropDownList1" propertyname="SelectedValue" />
<asp:formparameter name="anAddress" formfield="AddressBox" />
<asp:formparameter name="aCity" formfield="CityBox" />
<asp:formparameter name="aPostalCode" formfield="PostalCodeBox" />
</updateparameters>
</asp:objectdatasource>
<p><asp:textbox
id="AddressBox"
runat="server" /></p>
<p><asp:textbox
id="CityBox"
runat="server" /></p>
<p><asp:textbox
id="PostalCodeBox"
runat="server" /></p>
<asp:button
id="Button1"
runat="server"
text="Update Employee"
oncommand="Btn_UpdateEmployee" />
</form>
</body>
</html>
Comentários
Os nomes e tipos dos parâmetros contidos na UpdateParameters coleção devem corresponder aos nomes e tipos dos parâmetros que estão no método especificado pela assinatura da UpdateMethod propriedade. Os nomes dos parâmetros são afetados pela OldValuesParameterFormatString propriedade e diferenciam maiúsculas de minúsculas. Ao trabalhar com controles associados a dados que fornecem parâmetros, como GridView e DetailsView, o ObjectDataSource controle mescla automaticamente todos os parâmetros que são explicitamente especificados na coleção com os parâmetros fornecidos pelo controle associado a dados. Para obter mais informações, consulte ObjectDataSource.UpdateMethod.