Home Library Learn Downloads Support Community
Sign in | United States - English | |
0 out of 1 rated this helpful - Rate this topic

Parameter Class

WCF RIA Services

[WCF RIA Services Version 1 Service Pack 2 is compatible with either .NET framework 4 or .NET Framework 4.5, and with either Silverlight 4 or Silverlight 5.]

Defines parameters for domain service queries used by DomainDataSource.

System.Object
  System.Windows.DependencyObject
    System.Windows.Controls.Parameter

Namespace:  System.Windows.Controls
Assembly:  System.Windows.Controls.DomainServices (in System.Windows.Controls.DomainServices.dll)
C#
C++
F#
JScript
VB
Copy 
public class Parameter : DependencyObject

The Parameter type exposes the following members.

  Name Description
Public method Parameter Initializes a new instance of the Parameter class.
Top
  Name Description
Public property Dispatcher (Inherited from DependencyObject.)
Public property ParameterName Gets or sets the name of the parameter.
Public property Value Gets or sets the value of the parameter.
Top
  Name Description
Public method CheckAccess (Inherited from DependencyObject.)
Public method ClearValue (Inherited from DependencyObject.)
Public method Equals (Inherited from Object.)
Protected method Finalize (Inherited from Object.)
Public method GetAnimationBaseValue (Inherited from DependencyObject.)
Public method GetHashCode (Inherited from Object.)
Public method GetType (Inherited from Object.)
Public method GetValue (Inherited from DependencyObject.)
Protected method MemberwiseClone (Inherited from Object.)
Public method ReadLocalValue (Inherited from DependencyObject.)
Public method SetValue (Inherited from DependencyObject.)
Public method ToString (Inherited from Object.)
Top
  Name Description
Public field Static member ParameterNameProperty Identifies the ParameterName dependency property.
Public field Static member ValueProperty Identifies the Value dependency property.
Top

In some cases, a query method requires parameter values. Typically, a query method requires a parameter value to filter the data that is returned. The DomainDataSource class provides the QueryParameters collection to facilitate adding parameters. To add a parameter that uses a value from the user for the query, you bind a Parameter object to the user-input control that contains the value to use in the query and include that parameter in the QueryParameters collection.

The following example shows how to specify a value from a combo box as the parameter value.

XAML
Copy 
<Grid x:Name="LayoutRoot" Background="White">
    <Grid.RowDefinitions>
        <RowDefinition Height="25" />
        <RowDefinition Height="Auto" />
    </Grid.RowDefinitions>    
    <riaControls:DomainDataSource x:Name="source" QueryName="GetProductsByColor" AutoLoad="true">
        <riaControls:DomainDataSource.DomainContext>
            <domain:ProductDomainContext />
        </riaControls:DomainDataSource.DomainContext>
        <riaControls:DomainDataSource.QueryParameters>
            <riaControls:ControlParameter 
                ParameterName="color" 
                ControlName="colorCombo" 
                PropertyName="SelectedItem.Content" 
                RefreshEventName="SelectionChanged" />
        </riaControls:DomainDataSource.QueryParameters>
    </riaControls:DomainDataSource>
    <ComboBox Width="60"  Grid.Row="0" x:Name="colorCombo">
        <ComboBoxItem Content="Black" />
        <ComboBoxItem Content="Blue" />
    </ComboBox>
    <data:DataGrid Grid.Row="1" ItemsSource="{Binding Data, ElementName=source}" />
</Grid>
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.
Did you find this helpful?
(1500 characters remaining)