string versus String !

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string versus String!

I have a question (a little embarrassing because I see it so late). What is the difference between String and string? Not in the way that String is a Class and string is a reference type. But rather how to think about them in the term of uses.

I searched and find this piece of gold, but I don't know how to use it very well:

Use "String" to refer specifically to the String class.
Use "string" when referring to an object of the String class.

How to use them, accordingly?

Thanks again.

Posted 14-Aug-09 5:01am

_Q12_

Updated 25-Aug-09 10:36am

Sean Ewington

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0x3c0 · Accepted Answer · 2009-08-14T05:07:00

Solution 1

String == string. They're aliases of the same class, just like ulong is an alias of UInt64

Posted 14-Aug-09 5:07am

0x3c0

Scott Dorman · Accepted Answer · 2009-08-14T05:10:00

There is no difference. string is the C# alias to String (which is really System.String). When the code compiles, all of your string types are converted to System.String in the IL.

Personally, I prefer using string when I am typing a variable and String when I am acessing static members of the class. This is only personal preference as I think it makes the code easier to follow. There is nothing wrong with code like:

bool empty = string.IsNullOrEmpty("");

instead of

bool empty = String.IsNullOrEmpty("");