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 void LoadWith(
	LambdaExpression expression
)

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.

Northwnd db = new Northwnd(@"c:\northwnd.mdf");
DataLoadOptions dlo = new DataLoadOptions();
dlo.LoadWith<Customer>(c => c.Orders);
db.LoadOptions = dlo;

var londonCustomers =
    from cust in db.Customers
    where cust.City == "London"
    select cust;

foreach (var custObj in londonCustomers)
{
    Console.WriteLine(custObj.CustomerID);
}

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