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Selector.SelectedValue الخاصية

Visual Studio 2010

Gets or sets the value of the SelectedItem, obtained by using SelectedValuePath.

مساحة الاسم:  System.Windows.Controls.Primitives
التجميع:  PresentationFramework (في PresentationFramework.dll)
XMLNS لـ XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation

[BindableAttribute(true)]
[LocalizabilityAttribute(LocalizationCategory.NeverLocalize)]
public Object SelectedValue { get; set; }
<object>
  <object.SelectedValue>
    <Object .../>
  </object.SelectedValue>
</object>

قيمة الخاصية

النوع: System.Object
قيمة للعنصر المختار.

معرّف الحقل

SelectedValueProperty

تعيين خصائص بيانات التعريف إلى true

BindsTwoWayByDefault , Journal

خاصية SelectedValuePath تعيين مسار الخاصية التي تستخدم في تحديد قيمة لخاصية SelectedValue. Setting SelectedValue to a value X attempts to select an item whose value evaluates to X; if no such item can be found, the selection is cleared.

The following example binds a ListBox to a collection of Employee objects. The example sets SelectedValuePath to @EmployeeNumber and SelectedValue to 12345. This selects the Employee that has 12345 as the value of EmployeeNumber. This example also binds a TextBlock to the SelectedValue of the ListBox. When the user changes the selection in the ListBox, the TextBlock is updated to show the employee number of the currently selected employee.


<XmlDataProvider x:Key="Employees" XPath="/Employees/*">
  <x:XData>
    <Employees xmlns="">
      <Employee Name="Terry Adams" Type="FTE" EmployeeNumber="1" />
      <Employee Name="Claire O&apos;Donnell" Type="FTE" EmployeeNumber="12345" />
      <Employee Name="Palle Peterson" Type="FTE" EmployeeNumber="5678" />
      <Employee Name="Amy E. Alberts" Type="CSG" EmployeeNumber="99222" />
      <Employee Name="Stefan Hesse" Type="Vendor" EmployeeNumber="-" />
    </Employees>
  </x:XData>
</XmlDataProvider>

<DataTemplate x:Key="EmployeeItemTemplate">
  <TextBlock Text="{Binding XPath=@Name}" />
</DataTemplate>


...


    <ListBox Name="employeeListBox"
             ItemsSource="{Binding Source={StaticResource Employees}}"
             ItemTemplate="{StaticResource EmployeeItemTemplate}"
             SelectedValue="12345"
             SelectedValuePath="@EmployeeNumber"/>

    <TextBlock Text="{Binding ElementName=employeeListBox, 
                      Path=SelectedValue}"/>



نظام التشغيل Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008, نظام التشغيل Windows Server 2003

لا يدعم .NET Framework و .NET Compact Framework كافة الإصدارات الخاصة بكل نظام أساسي. للحصول على قائمة بالإصدارات المدعمة، راجع متطلبات النظام إطار عمل .NET.

.NET Framework

مدعوم في: 4, 3.5, 3.0

NET Framework. Client Profile

مدعوم في: 4
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