ValueOrExeption

ValueOrException.cs

// see https://gist.github.com/mausch/2ef2e9b26a89d7594e3d

public struct ValueOrException<TValue>
{
	public ValueOrException(TValue value, Exception exception)
	{
		_value = value;
		_exception = exception;
	}

	readonly TValue _value;
	readonly Exception _exception;

	public static ValueOrException<TValue> Value(TValue v)
	{
		return new ValueOrException<TValue>(v, null);
	}

	public static ValueOrException<TValue> Exception(Exception e)
	{
		return new ValueOrException<TValue>(default(TValue), e);
	}

	public T Match<T>(Func<TValue, T> ifValue, Func<Exception, T> ifException)
	{
		if (_exception != null)
			return ifException(_exception);
		else
			return ifValue(_value);
	}

	public override string ToString()
	{
		if (_exception != null)
			return string.Format("Exception: {0}", _exception);
		else
			return string.Format("Value: {0}", _value);
	}
}

public static class ValueOrException
{
	public static ValueOrException<T> Value<T>(T value)
	{
		return ValueOrException<T>.Value(value);
	}

	public static ValueOrException<T> Exception<T>(Exception e)
	{
		return ValueOrException<T>.Exception(e);
	}

	public static IEnumerable<ValueOrException<TValue>> Catch<TValue>(this IEnumerable<TValue> source)
	{
		if (source == null)
			throw new ArgumentNullException("source");
		using (var e = source.GetEnumerator())
		{
			while (true)
			{
				ValueOrException<TValue> value;
				try
				{
					if (!e.MoveNext())
						yield break;
					value = Value(e.Current);
				}
				catch (Exception ex)
				{
					value = Exception<TValue>(ex);
				}
				yield return value;
			}
		}
	}
}