错误CS1056：意外字符'$'Xamarin Studio

Question

I had a Xamarin Project on Visual Studio 2015, for some reason I moved it over to latest version of Xamarin Studio (based on MonoDevelop), and I'm getting this error:

Error CS1056: Unexpected character '$' (CS1056)

Here's where it's happening:

...
        public override string ToString()
        {
            return $"{Title}";
        }

I'm using the new feature of C# 6.0 called "String Interpolation". My code worked fine on Visual Studio 2015 , why am I getting this error??

Answer 1

Looks like there is a setting inside the project properties that are controlling the ability to use C# 6 features.

Double-click every project involved to open the Project Options, go to Build > General [> C# (for PCL projects]. From there, choose Version 6 under C# Language Version.

Example for platform projects

Example for PCL projects (note the tab switch needed)

Answer 2

The problem can lie in a bug in some editors that mixes Unicode with ascii. This makes everything look correct in visual studio but when opened in another editor it can be seen that the file is corrupted.

Answer 3

The current version of Xamarin Studio does not support C#6.0 features, including String Interpolation.

There is a preview release of Xamarin Studio that uses the Microsoft Roslyn compiler and does support string interpolation (do note however that as of January 11th 2016 the current release will not actually BUILD code that uses C#6 features).

You can get the preview release here .