How to get the value of an input variable from a function using OneOf C#

Question

I want to get the input value from a function. I call the function:

Name=GetName(Paul)

Where Paul is a member of ClassA, ClassB or Class C. I want to use the following function to call other functions with Paul as an input depending on the class Paul is really in.

public static string GetName(OneOf<ClassA,ClassB,ClassC> input)
{
    var Variable = input.Match(
    ClassA => doSomethingWithA(input),
    ClassB => doSomethingWithB(input),
    ClassC => doSomethingWithC(input),
    );
}

When I try to input.Value or something like that, I just get the name of the class, but not Paul, which is unfortunate, because then I don't have the input I need for my functions doSomethingWith.

Has someone an idea how to solve this? It doesn't have to use the OneOf-Package.

Answer 1

You can use a lambda function based on the type of input and get the appropriate name accordingly.

Refer the code below:

using System;
using OneOf;

public class ClassA
{
    public string Name { get; set; }

    public ClassA(string name)
    {
        Name = name;
    }
}

public class ClassB
{
    public string Name { get; set; }

    public ClassB(string name)
    {
        Name = name;
    }
}

public class ClassC
{
    public string Name { get; set; }

    public ClassC(string name)
    {
        Name = name;
    }
}

public class Program
{
    public static void Main(string[] args)
    {
        var A = new ClassA("Paul");
        var B = new ClassB("John");
        var C = new ClassC("Sam");

        OneOf<ClassA, ClassB, ClassC> inputA = A;
        OneOf<ClassA, ClassB, ClassC> inputB = B;
        OneOf<ClassA, ClassB, ClassC> inputC = C;

        Console.WriteLine("Class A Name : "+GetName(inputA)); // Class A Name : Paul
        Console.WriteLine("Class B Name : "+GetName(inputB)); // Class B Name : John
        Console.WriteLine("Class C Name : "+GetName(inputC)); // Class C Name : Sam
    }


    /*
    * Method get Name given a OneOf from Class A , B , C
    */

    public static string GetName(OneOf<ClassA, ClassB, ClassC> input)
    {
        var variable = input.Match(
            classA => classA.Name,
            classB => classB.Name,
            classC => classC.Name
        );

        return variable;
    }
}

Refer to the working .netfiddle here