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DataServiceContext.SetLink Method

Notifies the DataServiceContext that a new link exists between the objects specified and that the link is represented by the property specified by the sourceProperty parameter.

Namespace:  System.Data.Services.Client
Assembly:  System.Data.Services.Client (in System.Data.Services.Client.dll)

'Declaration
Public Sub SetLink ( _
	source As Object, _
	sourceProperty As String, _
	target As Object _
)

Parameters

source
Type: System.Object
The source object for the new link.
sourceProperty
Type: System.String
The property on the source object that identifies the target object of the new link.
target
Type: System.Object
The child object involved in the new link that is to be initialized by calling this method. The target object must be a subtype of the type identified by the sourceProperty parameter. If target is set to null, the call represents a delete link operation.

ExceptionCondition
ArgumentNullException

When source, sourceProperty, or target are Nothing.

InvalidOperationException

When the link already exists.

-or-

When the source or target objects are in a Detached or Deleted state.

-or-

When sourceProperty is not a property that returns a reference.

A new link is created in the Added state. The DataServiceContext adds this new link to the set of newly created links to be sent to the data service on the next call to BeginSaveChanges.

If the target argument is null, the link represented by sourceProperty should be removed or deleted (The link is moved to the Deleted state).

Links are one-way relationships. If a back pointer exists that indicates a two-way association, this method should be called again to notify the DataServiceContext of the second link

This method only supports adding links to relationships with multiplicity = 1 (The source property is an object reference). For example, if a class Person is related to another Person by a Friend property, this call could be used to relate Person to Person. This method will throw an exception if the sourceProperty represented has a relationship of cardinality greater than one.

Silverlight

Supported in: 5, 4, 3

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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