AsUpdatable<T> Method (LiveViewExtensions)

Specifies a view as updatable.

Syntax

Visual Basic
C#

'Declaration
 
Public Shared Function AsUpdatable(Of T)( _
   ByVal view As View(Of T) _
) As View(Of T)

public static View<T> AsUpdatable<T>( 
   View<T> view
)

Parameters

view: The view to specify as updatable.

Type Parameters

T: The type of the elements in the view.

Return Value

The same view.

Remarks

This method is used with Join operation to specify which of the two parts of the join you want to be updatable.

Properties exposed by a view can be updatable or read-only. Updatable properties of a view can be modified directly in the view. Read-only properties of a view cannot be modified directly in the view, but they still reflect up-to-date values of the source, so the difference is often not critical, you can always modify corresponding property in the source, that will automatically change the property in the view.

Only one of the two arguments of a Join can be updatable, the one you qualified with AsUpdatable(). In absence of this qualification, both parts of the join are read-only. For example, in from c in customers.AsLive() join o in orders.AsLive().AsUpdatable() on o.CustomerID equals c.CustomerID select new { c.CustomerName, o.OrderDate, o.OrderAmount } CustomerName is read-only, and OrderDate and OrderAmount are updatable.

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

LiveViewExtensions Class
LiveViewExtensions Members
IsReadOnly Property
ViewRow Class
ViewRowState Enumeration