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The CSharp metamodel is the reflection of the C# language, as defined in version 2.0 of "C# Language Specification" from Microsoft Corporation.

The CSharp metamodel contains 81 metaclasses. To better understand it, this page will introduce the main features (metaclasses and links).

You could also browse the model definition csharp.ecore available in sources (see the install section).

Main meta classes


Every metaclass (except metaclass Fragment) inherits from ASTNode. As its name indicates, ASTNode represents a graph node. ASTNode has a reference to metaclass Comment because almost every csharp element could be associated to a comment (block or line comment).

ASTNode meta class

Assembly, Namespace, Type

The root element of each CSharp model is an instance of the Assembly metaclass. It is a translation of the concept of csharp application, so it contains namespace declarations (instances of the Namespace metaclass). And namespace declarations contain type declarations (instances compatible with metaclass Type), and so on ...

Assembly Namespace and Type

NamedElement & notion of Proxy

A lot of csharp elements are "named", and this name can be considered as an identifier : methods, packages, types, variables, fields, ... So all the corresponding metaclasses inherit from the NamedElement metaclass. It will be useful to resolve references in binding, see the NamedElementRef metaclass.

Another goal of this metaclass is to indicate for each element whether it is part of the current csharp application or not (element from an external .NET library). So external elements are tagged as proxy through a dedicated attribute and can be easily filtered. For example, instruction "Trace.WriteLine" has been decomposed into two named elements (one class and one method) the definitions of which are not part of the current csharp application. So attribute proxy of these elements has been initialized to true.

NamedElement and its hierarchy


To represent links between csharp elements, as the C# AST defines only string references, metaclass NamedElementRef initially contained only this information. But an important addition was to resolve bindings between elements, so it is actually possible to navigate directly through the elements graph. It has been represented as a relationship from a NamedElementRef to a NamedElement (proxy or not).

NamedElementRef meta class


A type declaration has different kinds of contents : fields, methods, static block, initialization block or other type declarations. All of these elements are of type InternalDeclaration metaclass.

InternalDeclaration and its hierarchy


Like in many languages, the concept of expression exists in C# : it is a portion of code, without declarations, and its evaluation returns a value, numerical or boolean or other ...

For example,
is an expression and will be translated into the concept of InfixExpression metaclass.

All types of expressions shall inherit from metaclass Expression.

Expression and its hierarchy


An "instruction" in C# is represented by the Statement metaclass. A block of code (Block metaclass) contains a collection of statements, and a block of code may be contained by a method.

Some examples of statements in C# :
if, while, for, do, ...

All of their definitions use the concept of expression to separate the value from the instruction keyword.

Statement and its hierarchy


To use the plug-in you need:

  • JDK 1.5 or above
  • a version of Eclipse 3.3 or above with the following set of plug-ins installed
  • EMF 2.3.0 or higher


Gabriel Barbier (Mia-Software)

Fabien Giquel (Mia-Software)

Frédéric Madiot (Mia-Software)


You will find a version of this plug-in attached in the following bug.

As IP review of this plug-in is not finished, here are installation instructions :

  • Extract archive file in your Eclipse workspace, then use "import" menu to import this project.
  • Use "export" menu to export this project as a plug-in (Deployable plug-ins and fragments) in your Eclipse installation. Don't forget to choose the "Package plug-ins as individual jar archives" option.
  • re-start your Eclipse to take this plug-in into account

Associated Discoverers

A first version of the C# discoverer : CSharpDiscoverer

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