Method not found: 'System.String System.String.Format(System.IFormatProvider, System.String, System.Object)

Question

I have a Web API 2 project with help pages that runs fine locally but throws this error when I push it to Azure:

Method not found: \'System.String Sys

Answer 1

Azure Data Lake Analytics runs on .NET 4.5 today. So we don't support .NET 4.6 assembly scenarios and this kind of errors are possible. To avoid it, you should rebuild your assembly in .NET 4.5.

The following "non-recommended" workaround might work with a .NET 4.6 assembly: Rewriting string.Format(provider, format, arg0, arg1) into string.Format(provider, format, new object[] { arg0, arg1 })