DataLoadOptions.AssociateWith<T> Method (Expression<Func<T, Object>>)
Filters objects retrieved for a particular relationship.
Assembly: System.Data.Linq (in System.Data.Linq.dll)
Type Parameters
- T
The type that is queried against.
If the type is unmapped, an exception is thrown.
Parameters
- expression
- Type: System.Linq.Expressions.Expression<Func<T, Object>>
Identifies the query to be used on a particular one-to-many field or property. Note the following:
If the expression does not start with a field or property that represents a one-to-many relationship, an exception is thrown.
If an operator other than a valid operator appears in the expression, an exception is thrown. Valid operators are as follows:
Where
OrderBy
ThenBy
OrderByDescending
ThenByDescending
Take
For information about how to avoid cycles, see DataLoadOptions.
In the following example, the inner loop iterates only over those Orders that have not been shipped today.
Northwnd db = new Northwnd(@"c:\northwnd.mdf"); DataLoadOptions dlo = new DataLoadOptions(); dlo.AssociateWith<Customer>(c => c.Orders.Where(p => p.ShippedDate != DateTime.Today)); db.LoadOptions = dlo; var custOrderQuery = from cust in db.Customers where cust.City == "London" select cust; foreach (Customer custObj in custOrderQuery) { Console.WriteLine(custObj.CustomerID); foreach (Order ord in custObj.Orders) { Console.WriteLine("\t {0}",ord.OrderDate); } }
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
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
