How to Convert Array to string [duplicate]

Question

I want to convert Array into string as

string[] parts={"1","2","3","4"};

and output as

string str="%1%2%3%4%";

Answer 1

Use string.Join:

var str = string.Join("%", parts);

And add in the surrounding % marks:

str = string.format("%{0}%", str);

Answer 2

Using C#-6 string interpolation:

var str = $"%{string.Join("%", parts)}%";