Returning value that was passed into a method

Question

I have a method on an interface   string DoSomething string whatever     I want to mock this with MOQ  so that it returns whatever was passed in - something like    mock Setup  theObject   gt  theObject DoSomething  It IsAny lt string gt             Returns   the parameter that was passed        Any ideas

User · Answer

The generic Returns lt T gt  method can handle this situation nicely    mock Setup x   gt  x DoSomething It IsAny lt string gt      Returns lt string gt  x   gt  x     Or if the method requires multiple inputs  specify them like so    mock Setup x   gt  x DoSomething It IsAny lt string gt     It IsAny lt int gt      Returns  string x  int y    gt  x

User · Answer

Even more useful  if you have multiple parameters you can access any all of them with    mock Setup x   gt  x DoSomething It IsAny lt string gt    It IsAny lt string gt    It IsAny lt string gt           Returns  string a  string b  string c    gt  string Concat a b c      You always need to reference all the arguments  to match the method s signature  even if you re only going to use one of them

User · Answer

You can use a lambda with an input parameter  like so    Returns  string myval    gt    return myval        Or slightly more readable    Returns lt string gt  x   gt  x

[c#] Returning value that was passed into a method

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