C# Either Monad

Either.cs

using System;

public class Either<TLeft, TRight>
{
    private readonly TLeft left;
    private readonly TRight right;
    private readonly bool isLeft;

    public Either(TLeft left)
    {
        this.left = left;
        this.isLeft = true;
    }

    public Either(TRight right)
    {
        this.right = right;
        this.isLeft = false;
    }

    public T Match<T>(Func<TLeft, T> leftFunc, Func<TRight, T> rightFunc)
        => this.isLeft ? leftFunc(this.left) : rightFunc(this.right);

    public static implicit operator Either<TLeft, TRight>(TLeft left) 
        => new Either<TLeft, TRight>(left);

    public static implicit operator Either<TLeft, TRight>(TRight right) 
        => new Either<TLeft, TRight>(right);

    public static explicit operator TLeft(Either<TLeft, TRight> either)
        => either.left;

    public static explicit operator TRight(Either<TLeft, TRight> either)
        => either.right;
}

public static class Either
{
    public static Either<TLeft, TRight> Left<TLeft, TRight>(TLeft value)
        => new Either<TLeft, TRight>(value);

    public static Either<TLeft, TRight> Right<TLeft, TRight>(TRight value)
        => new Either<TLeft, TRight>(value);
}