CODEWITHSUNDEEP
c#resharper-2019
MakePeaceGreatAgain
MakePeaceGreatAgain

Reputation: 37050

Migrate code with R# Structural Search and Replace

I have legacy systems that I want to migrate to a new data model. It boils down to many type name changing. In order to not break existing code, I plan to use compiler switches:

#if NEW
    var variable = new MyNewType();
#else
    MyOldType variable = new MyOldType();
#endif

I created a Resharper replace pattern:

#if NEW
    var $variable$ = new $type$();
#else
    $type$ $variable$ = new $type$();
#endif

type is defined as a type placeholder and variable is an identifier placeholder. However, I get a syntax error while parsing that expression:

unexpected placeholder "variable"

Is introducing compiler switches with Resharper not possible, or where did I go wrong?

Upvotes: 0

Views: 38

Answers (1)

HarinezumiSama
HarinezumiSama

Reputation: 16

As far as I know, R# doesn't support this case. I believe it's because R# relies on the Abstract Syntax Tree (AST) of the current code. And in your case AST depends on which statements would actually be compiled based on whether NEW is defined or not.

Upvotes: 0

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