String or string

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In C# what is the difference between String and string

what's the difference between the String and string. In C#, which is preferred?

@Jason: That's the boilerplate text that turns up when I choose "close as exact duplicate." Can I change that? — Ani, Nov 16 '10 at 05:57
@Ani: I was not aware that there is such a feature. Is that new? — jason, Nov 16 '10 at 06:02
@Jason: No idea. Maybe it works differently for users with different rep? — Ani, Nov 16 '10 at 06:05

score 5 · Answer 1 · edited May 23 '17 at 12:32

Actually string is an alias for System.String but erash is basically right...

Here is a list of other alias' shamelessly lifted from Jon Skeet in this post:

* object: System.Object
* string: System.String
* bool: System.Boolean
* byte: System.Byte
* sbyte: System.SByte
* short: System.Int16
* ushort: System.UInt16
* int: System.Int32
* uint: System.UInt32
* long: System.Int64
* ulong: System.UInt64
* float: System.Single
* double: System.Double
* decimal: System.Decimal
* char: System.Char

score 2 · Answer 2 · answered Nov 16 '10 at 05:50

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They are the same this, string is an alias for String.

I tend to use String when calling static methods (i.e., String.Format(...) or String.IsNullOrEmpty(...). I don't know why, I just do.

answered Nov 16 '10 at 05:50

Ed S.

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I do the same, probably because it feels wrong calling a static method on something that doesn't look like a class. – Phil Nov 16 '10 at 05:53
Haha, yeah, maybe that's it. I prefer teal to blue. – Ed S. Nov 16 '10 at 05:55
It makes sense... when you're using it like a class, you want it to look like a class. – mpen Nov 16 '10 at 05:56

score 1 · Answer 3 · answered Nov 16 '10 at 05:49

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string is just an alias for String -- they are the same

edit: type fixed

answered Nov 16 '10 at 05:49

cordialgerm

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I think you actually have that backwards. – Joel Coehoorn Nov 16 '10 at 05:49
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I think it's the other way around. Like `int` is an alias for `Int32` – Phil Nov 16 '10 at 05:50

score 1 · Answer 4 · answered Nov 16 '10 at 05:50

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string is a C#-specific keyword that means the same thing as the System.String type. Prefer the language keywords where possible, so use e.g. string, int, float, instead of System.String, System.Int32, System.Single.

answered Nov 16 '10 at 05:50

cdhowie

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Aside from the fact that it looks a *lot* cleaner, this is the guideline in most open source projects and is the style MS uses in their documentation. – cdhowie Nov 16 '10 at 05:54
float == Single? Didn't know that... I guess it's half a double though so that makes sense... still a funny name though. – mpen Nov 16 '10 at 05:55
For the rest I would agree about the 'it looks cleaner' statement, but the question is about the String class, and I don't think string looks any cleaner than String. In general though, yeah. – Ed S. Nov 16 '10 at 05:56
If he was not asking about the class, what else would he be asking about? When you reference the class from code when e.g. declaring a variable, do you not use `string`? – cdhowie Nov 16 '10 at 05:58

String or string

4 Answers4