CODEWITHSUNDEEP
c#visual-studiovisual-studio-2010optional-parameters
dlsou
dlsou

Reputation: 665

C# VS 2010 reports error while editing but it compiles and runs successfully

I have optional parameters generated by CodeDom. For example:

class Square
{
    public Square([Optional()] int side) { }
}

I have a call statement:

Square sq = new Square();

While I'm editing, my Error List window shows: 'Square' does not contain a constructor that takes 0 arguments'

But it compiles and runs successfully. How can I get rid of the error in 'Error List' window? Thanks!

Upvotes: 3

Views: 678

Answers (1)

JaredPar
JaredPar

Reputation: 755041

What you're seeing is the difference between IDE live semantic error checking and the actual compiler running. The live semantic checking uses the C# compiler but doesn't have 100% parity with it and it can produce false positives in corner cases of the language.

To get rid of this disable live semantic checking

  • Tools -> Options
  • Text Editor -> C# -> Advanced
  • Uncheck "Show live semantic errors"

Another way to fix this is to use the actual C# supported syntax for optional values

public Square(int side = 0) { }

Upvotes: 5

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