C#•3y ago

How to combine null coascence and ternary operator?

Hello, I have a string variable A. And I want to fill thid string A with value Yes if a bool is true, No if bool is false and empty string if bool is null, how do I do this in 1 line

10 Replies

Akseli•3y ago

guessing your bool is a bool? (nullable bool) since a normal bool cant be null, only false or true

fatsuperman.OP•3y ago

Yeah So i want to check if true false or null on 1 line

Pobiega•3y ago

double ternary.

Akseli•3y ago

you could do nested ternary, or if you allow a weird switch statement

Pobiega•3y ago

var x = tfn == null ? string.Empty : tfn ? "Yes" : "No";

var x = tfn == null ? string.Empty : tfn ? "Yes" : "No";

but yeah, please use a switch expression

fatsuperman.OP•3y ago

right now I have: variable == null ? " " : (bool)variable ? "YES" : "NO"

Akseli•3y ago

a switch expression

fatsuperman.OP•3y ago

It says I have to cast tfn @Pobiega

Pobiega•3y ago

bool? tfn = true;

string output = tfn switch
{
    true => "Yes",
    false => "No",
    null => string.Empty
};

bool? tfn = true;

string output = tfn switch
{
    true => "Yes",
    false => "No",
    null => string.Empty
};

this is the cleanest way for sure

var x = !tfn.HasValue ? string.Empty : tfn.Value ? "Yes" : "No";

var x = !tfn.HasValue ? string.Empty : tfn.Value ? "Yes" : "No";

I just yolo-coded it here in discord, sorry 😛 this is the nested ternary version but the above is nicer the switch expression one is so much nicer, it shows clearly whats going on and isnt confusing to read

fatsuperman.OP•3y ago

Thank you, you have given great answers.

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How to combine null coascence and ternary operator?

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