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Constant Expressions

A constant expression consists of a constant value. Constant values are directly converted to constant command tree expressions, without any translation on the client. This includes expressions that result in a constant value. Therefore, data source behavior should be expected for all expressions involving constants. This can result in behavior that differs from CLR behavior.

The following example shows a constant expression that is evaluated on the server.

Decimal totalDue = 200 + 3;
using (AdventureWorksEntities context = new AdventureWorksEntities())
IQueryable<string> salesInfo =
from s in context.SalesOrderHeaders
where s.TotalDue >= totalDue
select s.SalesOrderNumber;

Console.WriteLine("Sales order numbers:");
foreach (string orderNum in salesInfo)

LINQ to Entities does not support using a user class as a constant. However, a property reference on a user class is considered a constant, and will be converted to a command tree constant expression and executed on the data source.

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© 2014 Microsoft