Difference between Const and Static

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1.00/5 (2 votes)

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Hi Friends,
What is difference between use of const and static

EQ.

public static string CSS_SELECTOR_TEMPLATE = "{0} > a";

I can even write the same as

public const string CSS_SELECTOR_TEMPLATE = "{0} > a";

Only difference I found is
static variable can be replaced with new value, but const cannot.

Both can be accessed without creation of object of the class, like

GridCellCssSelectorEvaluator.CSS_SELECTOR_TEMPLATE

Can anyone tell me more usefulness of both?

Thanks in advance

Posted 3-Jul-14 18:54pm

dhage.prashant01

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PrakashCs.net 4-Jul-14 1:02am

static variable value can be change if it is static readonly variable in the constructor .

Sergey Alexandrovich Kryukov 4-Jul-14 1:10am

"Only"?!!! Don't you think this is dramatic difference?
—SA

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PrakashCs.net · Answer 1 · 2014-07-03T19:00:00

Solution 1

refer answers 3 in this link[^]

Posted 3-Jul-14 19:00pm

PrakashCs.net

Comments

Sergey Alexandrovich Kryukov 4-Jul-14 1:13am

Which one do you call "answer 3"? Two of those answers would earn my vote of 2. They are really bad.
—SA

PrakashCs.net 4-Jul-14 1:23am

answer 3 in link i.e.
When you use a const string, the compiler embeds the string's value at compile-time.
Therefore, if you use a const value in a different assembly, then update the original assembly and change the value, the other assembly won't see the change until you re-compile it.

A static readonly string is a normal field that gets looked up at runtime. Therefore, if the field's value is changed in a different assembly, the changes will be seen as soon as the assembly is loaded, without recompiling.

This also means that a static readonly string can use non-constant members, such as Environment.UserName or DateTime.Now.ToString(). A const string can only be initialized using other constants or literals.
Also, a static readonly string can be set in a static constructor; a const string can only be initialized inline.

Note that a static string can be modified; you should use static readonly instead.

Sergey Alexandrovich Kryukov 4-Jul-14 1:36am

Thank you. I'll up-vote your answer. But not by 5, for being so unclear. This answer is not 3, is marked as 41. I thought it was 3rd answer from top, which is bad.
—SA

Maciej Los 4-Jul-14 1:53am

It is not 3 and not 41;
3 means there are 3 answers, 41 is the count of upvotes ;)

Sergey Alexandrovich Kryukov 4-Jul-14 2:06am

Damn, they don't show answer IDs, probably to let people make mess.
Finally, we have one who can read; thank you, Maciej.
How are you?
—SA

Maciej Los 4-Jul-14 4:33am

Thank you, i'm fine. I've been busy last month...