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ObjectDataSourceView.Updating الحدث

Visual Studio 2010

You can also مؤشر the Update حدث that هو مرفوع بعد the أسلوب هو called.

مساحة الاسم:  System.Web.UI.WebControls
التجميع:  System.Web (في System.Web.dll)

public event ObjectDataSourceMethodEventHandler Updating

Handle the Updating event to perform additional initialization operations that are specific to your application, to validate the values of parameters, or to change the parameter values before the ObjectDataSource control performs the Update operation. Raises the IDictionary حدث قبل the InputParameters كائن attempts an تحديث تشغيل. ObjectDataSourceMethodEventArgs

للحصول على مزيد من المعلومات حول معالجة الأحداث، راجع استهلاك الأحداث.

DropDownList هو سلسلة التنسيق المطبق المفاتيح الأساسية فقط، مثل تلك التي يتم تحديدها مع TextBoxخاصية ربط بيانات عنصر تحكم أو حذفها وتحديث وحدات السيناريو، الموقع ObjectDataSourceتعيين خاصية إلى قيمة والمجموعة من قيم الأصلية التي تم تمريرها إلى المقابلة بيانات الأسلوب. The DropDownList displays the name of a NorthwindEmployee, while the TextBox controls are used to enter and update address information. Because the UpdateParameters collection contains a ControlParameter object that is bound to the selected value of the DropDownList, the button that triggers the Update operation is enabled only after an employee is selected.


<%@ 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>


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.NET Framework

مدعوم في: 4, 3.5, 3.0, 2.0
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