How to retrieve the parameters of a Q# operation? Is it possible to do such a thing at all?

  • $\begingroup$ This question seems similar to stackoverflow.com/questions/59022076/… - does the answer to that one help you? (I haven't tried doing that kind of thing myself so can't be sure) $\endgroup$ Commented Feb 17, 2020 at 19:20
  • $\begingroup$ @MariiaMykhailova That answer needs more explanation, what is IQ# been mentioned there? Does it help? $\endgroup$
    – Coder
    Commented Feb 17, 2020 at 19:31
  • 1
    $\begingroup$ IQ# is the Jupyter kernel for Q#. You can look at the source at github.com/microsoft/iqsharp. The file src\Core\OperationInfo.cs builds a list of the parameter types using reflection on the Run method of the generated class. $\endgroup$ Commented Feb 19, 2020 at 18:37

1 Answer 1


You are assuming a 1-1 mapping from a Q# operation with a C# operation but it doesn't work like that. A Q# operation can have a lot more functionality than a C# class, for example, Q# offers the ability to automatically create the adjoint and controlled versions of a the operation.

As Mariia pointed out, https://stackoverflow.com/questions/59022076/how-to-get-the-type-of-a-q-operation-parameter is a very similar question and the same answer applies:

Each Q# operations generations a C# class that extends the generic class Operation<I,O>, so to figure out what the input/output parameters you can take a look at the BaseType of the operation's Type, and look at the value of the GenericTypeArguments[0] to figure out the input type.


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