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SetLink Method

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)

public void SetLink(
	Object source,
	string sourceProperty,
	Object target
)

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 null.

InvalidOperationException

When the specified link already exists.

-or-

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

-or-

When sourceProperty is not a navigation property that defines a reference to a single related object.

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 SaveChanges.

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 indicating 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 more than one.

The following example shows how to use the AddLink and SetLink methods to create links that define relationships. In this example, the navigation properties on the Order_Details object are also explicitly set.

int productId = 25;
string customerId = "ALFKI";

Order_Details newItem = null;

// Create the DataServiceContext using the service URI.
NorthwindEntities context = new NorthwindEntities(svcUri);

try
{
    // Get the specific product.
    var selectedProduct = (from product in context.Products
                           where product.ProductID == productId
                           select product).Single();

    // Get the specific customer.
    var cust = (from customer in context.Customers.Expand("Orders")
                where customer.CustomerID == customerId
                select customer).Single();

    // Get the first order. 
    Orders order = cust.Orders.FirstOrDefault();

    // Create the a new order detail for the specific product.
    newItem = Order_Details.CreateOrder_Details(
        order.OrderID, selectedProduct.ProductID, 10, 5, 0);

    // Add the new order detail to the context.
    context.AddToOrder_Details(newItem);

    // Add links for the one-to-many relationships.
    context.AddLink(order, "Order_Details", newItem);
    context.AddLink(selectedProduct, "Order_Details", newItem);

    // Set reference links for the many-to-one relationships.
    context.SetLink(newItem, "Orders", order);
    context.SetLink(newItem, "Products", selectedProduct);

    // Add the new order detail to the collection, and 
    // set the reference to the product.
    order.Order_Details.Add(newItem);
    newItem.Products = selectedProduct;

    // Send the inserts to the data service.
    context.SaveChanges();
}
catch (DataServiceQueryException ex)
{
    throw new ApplicationException(
        "An error occurred when saving changes.", ex);
}

// Handle any errors that may occur during insert, such as  
// a constraint violation. 
catch (DataServiceRequestException ex)
{
    throw new ApplicationException(
        "An error occurred when saving changes.", ex);
}

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5 SP1

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