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

We are using custom build server. Even if project TargetFrameworkVersion is v4.5.1, when .net 4.6.1 installed to build server and single argument passed as format argument, the compiler prefers to use this overload

public static string Format(IFormatProvider provider, string format, object arg0)

instead of

public static string Format(IFormatProvider provider, string format, params object[] args)

Only solution is creating and passing array argument

Example:

string.Format(CultureInfo.CurrentCulture, "Hello {0}", new[] { name });