Readonly field that could be assigned a value outside constructor

Question

Is there a way to have a private readonly field in a class that could be assigned a value anywhere in the class, but only once??

That is, I am looking for a private read

Answer 1

This looks like a good candidate for declaration assignment or singleton.

public class SomeClass {
    private readonly Type t = typeof(SomeClass);
}

Or otherwise, like the others said, make an internal or so property with only a setter, then assign a value to it.

public class SomeClass {
    private Type t;

    internal Type Type {
        set {
            if (t == null) t = value;
        }
    }
}