Visual studio 2015 compile error: CS0570 is not supported by the language

Question

Migrating to VS2015, I encountered a compilation problem. No change on projects' target framework, they remain .net 4.5

The compiler seems not recognize the types of parameters

void BootstrapOIS(List<long>^ %resultDates, List<double>^ %resultRates,
    const long tradingDate, /*const*/ List<int>^ periodNumbers,
    /*const*/ List<String^>^ periods, /*const*/ List<double>^ swapsRates,
    /*const*/ List<long>^ hol);

Error CS0570 'BootstrapWrapper.BootstrapOIS(ref ?, ?, ?, ?, ?, ?, ?)' is not supported by the language

The referenced assembly:

• Bootstrap, Version=1.0.4918.15400, Culture=neutral, PublicKeyToken=b007f9158e880332
• Global type:
• Architecture: x64
• This assembly contains unmanaged code.
• Runtime: .NET 4.0

The compilation went well with VS2013.

Answer 1

It looks like you are mixing standard and CLR types in your declaration. The generated code (from ILSpy) is the same but it chokes when using it from C#.

Using only CLR types in the signature seems to work:

void BootstrapOIS(List<Int64>^ %resultDates, List<System::Double>^ %resultRates,
    const Int64 tradingDate, List<Int32>^ periodNumbers, List<String^>^ periods,
    List<Double>^ swapsRates, List<Int64>^ hol);

Answer 2

I have run into a similar problem--supposedly Microsoft has an open bug on this.

Try removing the "const" declaration, and change tradingDate to an Int64 variable. If that resolves it then, congratulations, you have a successful workaround.