Checking Console.ReadLine()!=null

Question

I am making a CMD for my application, and figure I have a trouble when I check `Console.ReadLine != null``

string input = Console.ReadLine();
 if(input != nu         


        

Answer 1

Instead of just checking for null, try checking if it is empty or null using String.IsNullOrEmpty because, when you do not input anything and press Enter, you get an empty string which results in an

An unhandled exception of type 'System.IndexOutOfRangeException'

Your updated full code should be as follows

string input = Console.ReadLine();
if (!string.IsNullOrEmpty(input) )
{
    SomeFunction(input);
}

Answer 2

if(!string.IsNullOrWhiteSpace(input))
    DoYourWork(input);

Answer 3

Thanks Every one!

i figured that i can just check if length of string is 0.

if(input.Length==0) //(Actually, will check if input.Length !=0 before calling function based on original source)

pretty simple. but

!string.IsNullOrEmpty(input)

works as well. every day learning something new. thanks for your help!

Answer 4

When you hit ENTER, Console.ReadLine returns empty string. It doesn't return null. Use string.IsNullOrEmpty to check instead.

if(!string.IsNullOrEmpty(input))

According to documentation it will return null only if you press CTRL + Z.