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DynamicILInfo Class

Updated: January 2010

Provides support for alternative ways to generate the Microsoft intermediate language (MSIL) and metadata for a dynamic method, including methods for creating tokens and for inserting the code, exception handling, and local variable signature blobs.

Namespace:  System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

public class DynamicILInfo

The DynamicILInfo class allows developers to write their own MSIL generators instead of using ILGenerator.

To create instances of other types, call methods, and so on, the MSIL you generate must include tokens for those entities. The DynamicILInfo class provides several overloads of the GetTokenFor method, which return tokens valid in the scope of the current DynamicILInfo. For example, if you need to call an overload of the Console.WriteLine method, you can obtain a RuntimeMethodHandle for that overload and pass it to the GetTokenFor method to obtain a token to embed in your MSIL.

Once you have created Byte arrays for your local variable signature, exceptions, and code body, you can use the SetCode, SetExceptions, and SetLocalSignature methods to insert them into the DynamicMethod associated with your DynamicILInfo object.

Generating your own metadata and MSIL requires familiarity with the Common Language Infrastructure (CLI) documentation, especially "Partition II: Metadata Definition and Semantics" and "Partition III: CIL Instruction Set". The documentation is available online; see ECMA C# and Common Language Infrastructure Standards on MSDN and Standard ECMA-335 - Common Language Infrastructure (CLI) on the Ecma International Web site.


Do not use DynamicILInfo to generate code that creates a delegate to another dynamic method by calling the delegate constructor directly. Instead, use the CreateDelegate method to create the delegate. A delegate that is created with the delegate constructor does not have a reference to the target dynamic method. The dynamic method might be reclaimed by garbage collection while the delegate is still in use.


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0




January 2010

Added advice to use the CreateDelegate method to create delegates to dynamic methods.

Customer feedback.