ObjectDataSourceMethodEventArgs.InputParameters Właściwość

Definicja

Pobiera kolekcję zawierającą parametry metody obiektu biznesowego i ich wartości.Gets a collection that contains business object method parameters and their values.

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

Wartość właściwości

IOrderedDictionary

IDictionaryPary nazwa/wartość, które reprezentują parametry metody obiektu biznesowego i odpowiadające im wartości.An IDictionary of name/value pairs that represent the business object method parameters and their corresponding values.

Przykłady

Poniższy przykład kodu ilustruje sposób używania DropDownList kontrolki, TextBox kontrolek i kilku ObjectDataSource kontrolek do aktualizowania danych.The following code example demonstrates how to use a DropDownList control, TextBox controls, and several ObjectDataSource controls to update data. DropDownListWyświetla nazwę pracownika Northwind, podczas gdy kontrolki służą TextBox do wprowadzania i aktualizowania informacji o adresie.The DropDownList displays the name of a Northwind Employee, while the TextBox controls are used to enter and update address information. Ponieważ UpdateParameters Właściwość zawiera ControlParameter obiekt, który jest powiązany z wybraną wartością DropDownList formantu, przycisk wyzwalający Update metodę jest włączony tylko po wybraniu pracownika.Because the UpdateParameters property contains a ControlParameter object that is bound to the selected value of the DropDownList control, the button that triggers the Update method is only enabled after an employee is selected.

W tym przykładzie NorthwindEmployeeUpdating Metoda jest wywoływana przed Update metodą, aby dodać do kolekcji poprawne parametry i wartości InputParameters .In this example, the NorthwindEmployeeUpdating method is called before the Update method to add the correct parameters and values to the InputParameters collection. Można dynamicznie dodawać parametry i wartości, jak pokazano lub deklaratywnie.You can add the parameters and values dynamically, as demonstrated, or declaratively.

<%@ 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>

Uwagi

Parametry można przesłać do metody obiektu biznesowego przez odwołanie lub przez wartość.Parameters can be passed to the business object method by reference or by value. Jeśli używasz ObjectDataSourceMethodEventHandler obiektu do obsługi Selecting Updating zdarzeń,, Inserting lub Deleting , możesz uzyskać dostęp do tych parametrów i manipulować nimi przy użyciu InputParameters właściwości.If you use an ObjectDataSourceMethodEventHandler object to handle the Selecting, Updating, Inserting, or Deleting events, you can access and manipulate these parameters using the InputParameters property. Wszelkie zmiany parametrów w tym słowniku wpłyną na to, które Przeciążenie metody jest wywoływana dla operacji.Any changes to the parameters in this dictionary will affect which method overload is called for the operation. Po DataObjectTypeName ObjectDataSource ustawieniu właściwości kontrolki można modyfikować tylko właściwości obiektu danych dla elementów w tym słowniku. nie można dodawać ani usuwać parametrów.When the DataObjectTypeName property of the ObjectDataSource control is set, you can modify only the data object properties for the items in this dictionary; you cannot add or remove parameters. Aby uzyskać więcej informacji, zobacz Delete.For more information, see Delete.

Parametry, które są przesyłane przez odwołanie są zwracane we OutputParameters właściwości ObjectDataSourceStatusEventArgs obiektu.Parameters that are passed by reference are returned in the OutputParameters property of the ObjectDataSourceStatusEventArgs object.

Dotyczy