c# - Call one constructor from another

I have two constructors which feed values to readonly fields.

public class Sample
{

    public Sample(string theIntAsString)
    {
        int i = int.Parse(theIntAsString);
        _intField = i;
    }

    public Sample(int theInt) => _intField = theInt;
    public int IntProperty    => _intField;

    private readonly int _intField;

}

One constructor receives the values directly, and the other does some calculation and obtains the values, then sets the fields.

Now here's the catch:

1. I don't want to duplicate the
   setting code. In this case, just one
   
   field is set but of course there may
   well be more than one.


2. To make the fields readonly, I need
   to set them from the constructor, so
   I can't "extract" the shared code to
   a utility function.


3. I don't know how to call one
   constructor from another.

Any ideas?

Answer

Like this:

public Sample(string str) : this(int.Parse(str)) { }