Question

I’ve implemented a TryParse function for a class MinMax like this:

    public static bool TryParse(string s, out MinMax result)
    {
        var parts = s.Split(' ');
        if (parts.Length != 2)
        {
            return false;
        }
        float min;
        float max;
        if (!float.TryParse(parts[0].Trim(), out min) || !float.TryParse(parts[1].Trim(), out max))
        {
            return false;
        }
        result = new MinMax(min, max);
        return true;
    }

However this doesn’t compile since apparently the out parameter needs to be written. What’s the correct way to fix this? I would like to be able to use the function so that if the parsing fails, the parameter passed into it remains unchanged. I guess one way would be to add something like:

result = result;

but this line issues a warning.

Answer 1

Assuming MinMax is a reference type, just assign null to it. Just like any other TryParse method would work.

Check out this code:

    string s = "12dfsq3";
    int i = 444;
    int.TryParse(s, out i);
    Console.WriteLine(i);

i will be set to 0 instead of remaining at 444.