Handling a conditional statement in a single line [duplicate]

Question

Is it possible to write following C# code in a line without if and else?

string res = ""; if (!string.IsNullOrEmpty(var1)) res = string.Format("{0}/{1}", var1, var2); else res = var2;

You can quickly find that by googling terms like those in the title of your question, (along with 'C#', even if the same operator exists in many languages anyway) idownvotedbecau.se/noresearch — Pac0
– Pac0, Commented Mar 5, 2020 at 13:09
string res = string.IsNullOrEmpty(var1) ? var2 : string.Format("{0}/{1}", var1, var2) ; — Zeeshan
– Zeeshan, Commented Mar 5, 2020 at 13:11

Berkay Yaylacı · Accepted Answer · 2020-03-05 13:15:16Z

3

Try this,

string res = !string.IsNullOrEmpty(var1) ? string.Format("{0}/{1}", var1, var2) : var2;

Basically, (if this statement is true (like if block's condition part)) ? (this section works) : ((else) this section works);

Hope this helps,

edited Mar 5, 2020 at 13:15

answered Mar 5, 2020 at 13:07

Berkay Yaylacı

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2 Comments

Martin Over a year ago

As OP does not know what the ternary operator is, perhaps it would be prudent to include an explanation in this answer?

Berkay Yaylacı Over a year ago

You are right, tried to explain basically. @Martin

elvira.genkel · Accepted Answer · 2020-03-05 13:32:21Z

The conditional operator ?:, also known as the ternary conditional operator, evaluates a Boolean expression and returns the result of one of the two expressions, depending on whether the Boolean expression evaluates to true or false. The syntax for the conditional operator is as follows:

condition ? consequent : alternative

So the code line you are requested is

string res = !string.IsNullOrEmpty(var1) ? string.Format("{0}/{1}", var1, var2) : var2;

As OP clearly does not know what the ternary operator is, perhaps it would be prudent to include an explanation in this answer?

Dmitrii Bychenko · Accepted Answer · 2020-03-05 13:11:12Z

Tecnically, you can hide if within ternary operator ?:

 string res = $"{(!string.IsNullOrEmpty(var1) ? $"{var1}/" : "")}{var2}";

but what for?

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