DataLoadOptions.LoadWith Method (LambdaExpression)

 

Retrieves specified data related to the main target by using a lambda expression.

Namespace:   System.Data.Linq
Assembly:  System.Data.Linq (in System.Data.Linq.dll)

Public Sub LoadWith (
	expression As LambdaExpression
)

Parameters

expression
Type: System.Linq.Expressions.LambdaExpression

A lambda expression that identifies the related material.

In the following example, all the Orders for all the Customers who are located in London are retrieved when the query is executed. As a result, successive access to the Orders property on a Customer object does not trigger a new database query.

Dim db As New Northwnd("c:\northwnd.mdf")

Dim dlo As DataLoadOptions = New DataLoadOptions()
dlo.LoadWith(Of Customer)(Function(c As Customer) c.Orders)
db.LoadOptions = dlo

Dim londonCustomers = _
    From cust In db.Customers _
    Where cust.City = "London" _
    Select cust

For Each custObj In londonCustomers
    Console.WriteLine(custObj.CustomerID)
Next

.NET Framework
Available since 3.5
Windows Phone Silverlight
Available since 7.1
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