The System.Reflection.Emit namespace contains classes that allow a compiler or tool to emit metadata and Microsoft intermediate language (MSIL) and optionally generate a PE file on disk. The primary clients of these classes are script engines and compilers.

	Class	Description
	AssemblyBuilder	Defines and represents a dynamic assembly.
	ConstructorBuilder	Defines and represents a constructor of a dynamic class.
	CustomAttributeBuilder	Helps build custom attributes.
	DynamicILInfo	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.
	DynamicMethod	Defines and represents a dynamic method. This class cannot be inherited.
	EnumBuilder	Describes and represents an enumeration type.
	EventBuilder	Defines events for a class.
	FieldBuilder	Defines and represents a field. This class cannot be inherited.
	GenericTypeParameterBuilder	Defines and creates generic type parameters for dynamically defined generic types and methods. This class cannot be inherited.
	ILGenerator	Generates Microsoft intermediate language (MSIL) instructions.
	LocalBuilder	Represents a local variable within a method or constructor.
	MethodBuilder	Defines and represents a method (or constructor) on a dynamic class.
	MethodRental	Provides a fast way to swap method body implementation given a method of a class.
	ModuleBuilder	Defines and represents a module. Get an instance of ModuleBuilder by calling DefineDynamicModule.
	OpCodes	Provides field representations of the Microsoft Intermediate Language (MSIL) instructions for emission by the ILGenerator class members (such as Emit).
	ParameterBuilder	Creates or associates parameter information.
	PropertyBuilder	Defines the properties for a type.
	SignatureHelper	Provides methods for building signatures.
	TypeBuilder	Defines and creates new instances of classes during runtime.
	UnmanagedMarshal	Represents the class that describes how to marshal a field from managed to unmanaged code. This class cannot be inherited.

Structures

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	Structure	Description
	EventToken	Represents the Token returned by the metadata to represent an event.
	FieldToken	The FieldToken struct is an object representation of a token that represents a field.
	Label	Represents a label in the instruction stream. Label is used in conjunction with the ILGenerator class.
	MethodToken	The MethodToken struct is an object representation of a token that represents a method.
	OpCode	Describes a Microsoft intermediate language (MSIL) instruction.
	ParameterToken	The ParameterToken struct is an opaque representation of the token returned by the metadata to represent a parameter.
	PropertyToken	The PropertyToken struct is an opaque representation of the Token returned by the metadata to represent a property.
	SignatureToken	Represents the Token returned by the metadata to represent a signature.
	StringToken	Represents a token that represents a string.
	TypeToken	Represents the Token returned by the metadata to represent a type.

Enumerations

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	Enumeration	Description
	AssemblyBuilderAccess	Defines the access modes for a dynamic assembly.
	FlowControl	Describes how an instruction alters the flow of control.
	OpCodeType	Describes the types of the Microsoft intermediate language (MSIL) instructions.
	OperandType	Describes the operand type of Microsoft intermediate language (MSIL) instruction.
	PackingSize	Specifies one of two factors that determine the memory alignment of fields when a type is marshaled.
	PEFileKinds	Specifies the type of the portable executable (PE) file.
	StackBehaviour	Describes how values are pushed onto a stack or popped off a stack.