I have generated this simplified version of my problem:
public class Variable { public Variable(string s, int i) { } public Variable(string str) : base(str, 0) // error here { } } Clearly I have a constructor that take 2 arguments. But the error is saying that I don't.
I am confused.
I am using .NET Standard 2.0
Please ask for any additional clarification.
base class (object in your case) doesn't have such a constructor
object(string s, int i) But your current class this does have the required constructor:
public class Variable { public Variable(string s, int i) { } public Variable(string str) : this(str, 0) // current class constructor call { } } 
base() to overload contructors in c#.. Is it (use of this) only in .net-standard or everywhere in c# ?
this as a current class constructor can be used everywhere in c#: base(str, 0) is calling the Object constructor which doesn't have one for 2 parameters.
use this instead
: this(str, 0) 
: this(str, 0)instead of: base(str, 0)