ResultOrException.cs

[DebuggerDisplay("{ToString(),nq}")]
public struct ResultOrException<T>
{
    [DebuggerBrowsable(DebuggerBrowsableState.Never)]
    private readonly T result;

    public ResultOrException(T result)
    {
        this.result = result;
        Exception = null;
    }

    public ResultOrException(Exception exception)
    {
        result = default(T);
        Exception = exception;
    }

    /// <summary>
    /// Compare this property to null to determine whether this represents a result or an exception.
    /// </summary>
    public Exception Exception { get; }

    /// <summary>
    /// If Exception is not null, reading this property throws it to provide a convenient shorthand. If you do not want to throw, compare Exception to null to determine whether this represents a result or an exception.
    /// </summary>
    public T Result
    {
        [DebuggerNonUserCode]
        get
        {
            if (Exception != null) throw Exception;
            return result;
        }
    }

    public static implicit operator ResultOrException<T>(Exception exception) => new ResultOrException<T>(exception);

    public static implicit operator ResultOrException<T>(T result) => new ResultOrException<T>(result);

    public override string ToString() => Exception != null ? $"Exception: \"{Exception.Message}\"" : "Result: " + (Result?.ToString() ?? "(null)");
}