Expression<TDelegate>.Compile Expression<TDelegate>.Compile Expression<TDelegate>.Compile Expression<TDelegate>.Compile Method

Definition

Overloads

Compile() Compile() Compile() Compile()

Compiles the lambda expression described by the expression tree into executable code and produces a delegate that represents the lambda expression.

Compile(Boolean) Compile(Boolean) Compile(Boolean) Compile(Boolean)

Compiles the lambda expression described by the expression tree into interpreted or compiled code and produces a delegate that represents the lambda expression.

Compile(DebugInfoGenerator) Compile(DebugInfoGenerator) Compile(DebugInfoGenerator)

Produces a delegate that represents the lambda expression.

Compile() Compile() Compile() Compile()

Compiles the lambda expression described by the expression tree into executable code and produces a delegate that represents the lambda expression.

public:
 TDelegate Compile();
public TDelegate Compile ();
override this.Compile : unit -> 'Delegate
Public Function Compile () As TDelegate
Returns

A delegate of type TDelegate that represents the compiled lambda expression described by the Expression<TDelegate>.

Examples

The following code example demonstrates how Compile is used to execute an expression tree.


// Lambda expression as data in the form of an expression tree.
System.Linq.Expressions.Expression<Func<int, bool>> expr = i => i < 5;
// Compile the expression tree into executable code.
Func<int, bool> deleg = expr.Compile();
// Invoke the method and print the output.
Console.WriteLine("deleg(4) = {0}", deleg(4));

/*  This code produces the following output:

    deleg(4) = True
*/


' Lambda expression as data in the form of an expression tree.
Dim expression As System.Linq.Expressions.Expression(Of Func(Of Integer, Boolean)) = Function(ByVal i) i < 5
' Compile the expression tree into executable code.
Dim deleg As Func(Of Integer, Boolean) = expression.Compile()
' Invoke the method and print the output.
MsgBox(String.Format("deleg(4) = {0}", deleg(4)))

' This code produces the following output:
'
' deleg(4) = True

Remarks

The Compile method produces a delegate of type TDelegate at runtime. When that delegate is executed, it has the behavior described by the semantics of the Expression<TDelegate>.

The Compile method can be used to obtain the value of any expression tree. First, create a lambda expression that has the expression as its body by using the Lambda method. Then call Compile to obtain a delegate, and execute the delegate to obtain the value of the expression.

Compile(Boolean) Compile(Boolean) Compile(Boolean) Compile(Boolean)

Compiles the lambda expression described by the expression tree into interpreted or compiled code and produces a delegate that represents the lambda expression.

public:
 TDelegate Compile(bool preferInterpretation);
public TDelegate Compile (bool preferInterpretation);
override this.Compile : bool -> 'Delegate
Public Function Compile (preferInterpretation As Boolean) As TDelegate
Parameters
preferInterpretation
Boolean Boolean Boolean Boolean

true to indicate that the expression should be compiled to an interpreted form, if it is available; false otherwise.

Returns

A delegate that represents the compiled lambda expression described by the Expression<TDelegate>.

Compile(DebugInfoGenerator) Compile(DebugInfoGenerator) Compile(DebugInfoGenerator)

Produces a delegate that represents the lambda expression.

public:
 TDelegate Compile(System::Runtime::CompilerServices::DebugInfoGenerator ^ debugInfoGenerator);
public TDelegate Compile (System.Runtime.CompilerServices.DebugInfoGenerator debugInfoGenerator);
override this.Compile : System.Runtime.CompilerServices.DebugInfoGenerator -> 'Delegate
Parameters
debugInfoGenerator
DebugInfoGenerator DebugInfoGenerator DebugInfoGenerator DebugInfoGenerator

Debugging information generator used by the compiler to mark sequence points and annotate local variables.

Returns

A delegate containing the compiled version of the lambda.

Applies to