ObjectDataSourceMethodEventArgs.InputParameters Properti
Definisi
Penting
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Mendapatkan koleksi yang berisi parameter metode objek bisnis dan nilainya.
public:
property System::Collections::Specialized::IOrderedDictionary ^ InputParameters { System::Collections::Specialized::IOrderedDictionary ^ get(); };
public System.Collections.Specialized.IOrderedDictionary InputParameters { get; }
member this.InputParameters : System.Collections.Specialized.IOrderedDictionary
Public ReadOnly Property InputParameters As IOrderedDictionary
Nilai Properti
Pasangan IDictionary nama/nilai yang mewakili parameter metode objek bisnis dan nilai yang sesuai.
Contoh
Contoh kode berikut menunjukkan cara menggunakan DropDownList kontrol, TextBox kontrol, dan beberapa ObjectDataSource kontrol untuk memperbarui data. DropDownList menampilkan nama Karyawan Northwind, sementara TextBox kontrol digunakan untuk memasukkan dan memperbarui informasi alamat. UpdateParameters Karena properti berisi ControlParameter objek yang terikat ke nilai DropDownList kontrol yang dipilih, tombol yang memicu Update metode hanya diaktifkan setelah karyawan dipilih.
Dalam contoh ini, NorthwindEmployeeUpdating
metode dipanggil sebelum Update metode untuk menambahkan parameter dan nilai yang benar ke InputParameters koleksi. Anda dapat menambahkan parameter dan nilai secara dinamis, seperti yang ditunjukkan, atau secara deklaratif.
<%@ 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();
}
// Dynamically add parameters to the InputParameters collection.
private void NorthwindEmployeeUpdating(object source, ObjectDataSourceMethodEventArgs e) {
// The names of the parameters are the same as
// the variable names for the method that is invoked to
// perform the Update. The InputParameters collection is
// an IDictionary collection of name/value pairs,
// not a ParameterCollection.
e.InputParameters.Add("anID", DropDownList1.SelectedValue);
e.InputParameters.Add("anAddress" ,AddressBox.Text);
e.InputParameters.Add("aCity" ,CityBox.Text);
e.InputParameters.Add("aPostalCode",PostalCodeBox.Text);
}
</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. -->
<asp:objectdatasource
id="ObjectDataSource2"
runat="server"
updatemethod="UpdateEmployeeWrapper"
onupdating="NorthwindEmployeeUpdating"
typename="Samples.AspNet.CS.EmployeeLogic" />
<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
' Dynamically add parameters to the InputParameters collection.
Private Sub NorthwindEmployeeUpdating(source As Object, e As ObjectDataSourceMethodEventArgs)
' The names of the parameters are the same as
' the variable names for the method that is invoked to
' perform the Update. The InputParameters collection is
' an IDictionary collection of name/value pairs,
' not a ParameterCollection.
e.InputParameters.Add("anID", DropDownList1.SelectedValue)
e.InputParameters.Add("anAddress" ,AddressBox.Text)
e.InputParameters.Add("aCity" ,CityBox.Text)
e.InputParameters.Add("aPostalCode",PostalCodeBox.Text)
End Sub ' NorthwindEmployeeUpdating
</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. -->
<asp:objectdatasource
id="ObjectDataSource2"
runat="server"
updatemethod="UpdateEmployeeWrapper"
onupdating="NorthwindEmployeeUpdating"
typename="Samples.AspNet.VB.EmployeeLogic" />
<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>
Keterangan
Parameter dapat diteruskan ke metode objek bisnis dengan referensi atau berdasarkan nilai. Jika Anda menggunakan ObjectDataSourceMethodEventHandler objek untuk menangani Selectingperistiwa , , UpdatingInserting, atau Deleting , Anda dapat mengakses dan memanipulasi parameter ini menggunakan InputParameters properti . Setiap perubahan pada parameter dalam kamus ini akan memengaruhi metode mana yang kelebihan beban dipanggil untuk operasi. DataObjectTypeName Ketika properti ObjectDataSource kontrol diatur, Anda hanya dapat mengubah properti objek data untuk item dalam kamus ini; Anda tidak dapat menambahkan atau menghapus parameter. Untuk informasi selengkapnya, lihat Delete.
Parameter yang diteruskan oleh referensi dikembalikan dalam OutputParameters properti ObjectDataSourceStatusEventArgs objek .