C#•8mo ago

How can my out parameter be nullable?

Not sure what's going on, if anyone can give me a hand on this one

11 Replies

cheeze2000OP•8mo ago

so i have a dictionary called _names and the type is Dictionary<string, Ty> Ty is a class, name is a string

Angius•8mo ago

The Try pattern requires the out parameter to be nullable If the method returns false, the out has to be something, and the only option is a null

cheeze2000OP•8mo ago

ohhh

Angius•8mo ago

There's an attribute on it, [NotNullWhen] probably, that makes it so that it's not null when the return is true, yes But the type is still nullable That's why, most often, you see people use out var foo instead of out TheType foo

cheeze2000OP•8mo ago

Dictionary<string, int> test = [];

if (test.TryGetValue("", out int num))
{
  // what is num here? zero?
}

Dictionary<string, int> test = [];

if (test.TryGetValue("", out int num))
{
  // what is num here? zero?
}

Angius•8mo ago

$tias

MODiX•8mo ago

https://images-ext-1.discordapp.net/external/CO2vsU2aXbRqYy1RdewOYnkBq1nGFBjdbjlNgjvG67A/https/media.discordapp.net/attachments/364492811489509376/964064233035816990/unknown.png?width=543&height=257

cheeze2000OP•8mo ago

hehe wait it doesn't even work because there's no such entry in the dictionary oh it's 0, nice so it's just the default

Angius•8mo ago

Yep

cheeze2000OP•8mo ago

thanks

Unknown User•8mo ago

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How can my out parameter be nullable?