C# need some explanation about one line of code

Question

1.33/5 (3 votes)

See more:

Hello, im doing one code in C# using VisualStudio Windows Froms, and my question is:
I have this line of code

C#

buttonConnect.BackColor = Check.IsConnected ? Color.Red : Color.Green;

And my question is what is

x ? x : x ;

What I have tried:

I mean it's the same of this of have one if and else? what is the diference? or like one bool if true color.red if false color.green?

Posted 22-Jun-16 2:43am

MarioPT

Updated 22-Jun-16 21:33pm

v3

Add a Solution

Comments

johannesnestler 22-Jun-16 9:32am

open your C# book again (or open an old C++ one where this operator is also used)? No offending, but I just think for basic language syntax questions like this one, it's better to open a book or tutorial or the great MSDN reference where it all is explained in deepth with examples... Shure there are some more esorteric language features where it could make sense to ask the community for advice, but in this case I think you will learn a lot more by the official language reference on MSDN (maybe also read about the other Operators you may never have seen?) - just my 2c

3 solutions

Solution 3

Its simply a ternary operator which is there in almost all languages.

You can google more on that.

From a layman's point of view, the portion

before "?" is the condition

after "?"
1st part: if that condition returns TRUE
2nd part(after ":"): if it returns FLASE or DEFAUlt value

Posted 22-Jun-16 21:33pm

Prateek Dalbehera

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Karthik_Mahalingam · Accepted Answer · 2016-06-22T02:54:00

Solution 1

it is called as Ternary Operator[^]

equavalent syntax of [buttonConnect.BackColor = Check.IsConnected ? Color.Red : Color.Green;]
is

C#

if (Check.IsConnected)
      buttonConnect.BackColor = Color.Red;
  else
      buttonConnect.BackColor = Color.Green;

C#

var result = x ? y : z;
// x is the condition which should return a boolean value
// y will be assigned to result, if x is true
// z will be assigned to result, if x is false

refer this ?: Operator (C# Reference)[^]

Posted 22-Jun-16 2:54am

Karthik_Mahalingam

Updated 22-Jun-16 2:58am

v2

Comments

[no name] 22-Jun-16 11:57am

I like this Explanation, a 5. Bruno

Karthik_Mahalingam 23-Jun-16 0:00am

Thanks 0x01AA

Prateek Dalbehera 23-Jun-16 3:34am

Straight & simple...

OriginalGriff · Accepted Answer · 2016-06-22T02:56:00

Solution 2

It's a short form of if:

C#

if (Check.Isconnected)
   {
   buttonConnect.BackColor = Color.Red;
   }
else
   {
   buttonConnect.BackColor = Color.Green;
   }

See here: ?: Operator (C# Reference)[^]

Posted 22-Jun-16 2:56am

OriginalGriff

Comments

Prateek Dalbehera 23-Jun-16 3:30am

to get the concept clearly, just merge solution1 & solution2 ... you will be clear with ur doubts.