Get the size of a string

Question

I wish to know how to calculate the size of string data type. says what is the size of s under the following scenario?

string s="";
string s="1";
string s="12";

If possible, can point to a website mentioned this?

Define "size"? Number of characters? Number of unicode points? (this is not necessarily the same) Number of bytes under a yet-to-be-specified encoding? Number of pixels? Number of millimetres? Number of bytes comprising the `string` instance? — Marc Gravell, Apr 23 '14 at 12:48
If you're asking about the number of characters, then I think you should get yourself a c# book and read it before posting anything on the internet, because those are the absolute basics. — Tarec, Apr 23 '14 at 13:08

score 6 · Accepted Answer · edited May 23 '17 at 12:09

6

Refer to this link: How to know the size of the string in bytes?

System.Text.Encoding.Unicode.GetByteCount(s);
System.Text.Encoding.ASCII.GetByteCount(s);

or from msdn: http://msdn.microsoft.com/en-us/library/system.string.aspx

edited May 23 '17 at 12:09

Community

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answered Apr 23 '14 at 12:48

Snake Eyes

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Right. Just want to point out, that he will have to use the encoding according to the string he has :) – Boas Enkler Apr 23 '14 at 12:51
@BoasEnkler: What do you mean by that? A string in .NET doesn't *have* any idea of an encoding; or rather, the "native" representation is always UTF-16. It's not like there's such a thing as a "UTF-8 string". – Jon Skeet Apr 23 '14 at 12:53
Yes your right. I mixed up the fact that in files he could have diffenrent encodnings, but reading them in .net. would again end in UTF-16. My mistake :) – Boas Enkler Apr 23 '14 at 12:55

dav_i · Answer 2 · 2014-04-23T13:13:19.303

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It is not clear from your question what you meant.

If by size you mean how many characters, then Length is the property you are looking for

"".Length   // 0
"1".Length  // 1
"12".Length // 2

If by size you mean how many bytes then this is dependant on encoding and you can use the answer Snake Eyes has given

Encoding.Unicode.GetByteCount("")   // 0
Encoding.UTF8.GetByteCount("")      // 0

Encoding.Unicode.GetByteCount("1")  // 2
Encoding.UTF8.GetByteCount("1")     // 1

Encoding.Unicode.GetByteCount("12") // 4
Encoding.UTF8.GetByteCount("12")    // 2

If by size you mean value of the number then you will need to parse the text

Int32.Parse("")   // FormatException: Input string was not in a correct format
Int32.Parse("1")  // 1
Int32.Parse("12") // 12

edited Apr 23 '14 at 13:13

answered Apr 23 '14 at 12:52

dav_i

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OP asks for size of string, not length, is a difference. – Snake Eyes Apr 23 '14 at 12:53
@SnakeEyes The OP may not have used the correct word. Your answer deals with one possibility, mine another. And I did clarify this point in the first part of my answer "If by size you mean how many characters". – dav_i Apr 23 '14 at 12:54
I think for `size` means `how many kilobytes` use, for `length` how many characters contain. – Snake Eyes Apr 23 '14 at 12:58
And he mentioned: `size of string data type`, not a string as value. – Snake Eyes Apr 23 '14 at 13:01
Until the OP clarifies his/her answer, all we can do is guess their intentions! – dav_i Apr 23 '14 at 13:07
I voted up because you provided complete answer – Snake Eyes Apr 23 '14 at 13:24

score 0 · Answer 3 · answered Apr 23 '14 at 12:48

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please use the code below

long size=sizeof(char) *s.length;

answered Apr 23 '14 at 12:48

nevillebowers

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score 0 · Answer 4 · answered Apr 23 '14 at 13:20

LMGTFY

Anything and everything string http://msdn.microsoft.com/en-us/library/system.string.aspx

String Length http://msdn.microsoft.com/en-us/library/system.string.length.aspx

String number of bytes (and string to byte array is covered in examples) http://msdn.microsoft.com/en-us/library/w3739zdy(v=vs.110).aspx

Get the size of a string

4 Answers4