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CompiledQuery.Compile<TArg0, TArg1, TResult> Method (Expression<Func<TArg0, TArg1, TResult>>)

Creates a new delegate that represents the compiled LINQ to Entities query.

Namespace:  System.Data.Objects
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

public static Func<TArg0, TArg1, TResult> Compile<TArg0, TArg1, TResult>(
	Expression<Func<TArg0, TArg1, TResult>> query
)
where TArg0 : ObjectContext

Type Parameters

TArg0

A type derived from ObjectContext.

TArg1

Represents the type of the parameter that has to be passed in when executing the delegate returned by this method. TArg1must be a primitive type.

TResult

The type T of the query results returned by executing the delegate returned by the Compile method.

Parameters

query
Type: System.Linq.Expressions.Expression<Func<TArg0, TArg1, TResult>>
The lambda expression to compile.

Return Value

Type: System.Func<TArg0, TArg1, TResult>
Func<T1, T2, TResult>, a generic delegate that represents the compiled LINQ to Entities query.

For more information and examples, see Compiled Queries.

The following example compiles and then invokes a query that accepts a Decimal input parameter and returns a sequence of orders where the total due is greater than or equal to $200.00:


static readonly Func<AdventureWorksEntities, Decimal, IQueryable<SalesOrderHeader>> s_compiledQuery2 = 
    CompiledQuery.Compile<AdventureWorksEntities, Decimal, IQueryable<SalesOrderHeader>>(
            (ctx, total) => from order in ctx.SalesOrderHeaders
                            where order.TotalDue >= total
                            select order);

static void CompiledQuery2()
{            
    using (AdventureWorksEntities context = new AdventureWorksEntities())
    {
        Decimal totalDue = 200.00M;

        IQueryable<SalesOrderHeader> orders = s_compiledQuery2.Invoke(context, totalDue);

        foreach (SalesOrderHeader order in orders)
        {
            Console.WriteLine("ID: {0}  Order date: {1} Total due: {2}",
                order.SalesOrderID,
                order.OrderDate,
                order.TotalDue);
        }
    }            
}


.NET Framework

Supported in: 4, 3.5 SP1

.NET Framework Client Profile

Supported in: 4

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.

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