Case-insensitive List<string>

[Mark Rae]

Hi,

Is it possible to create a case-insensitive List<stringcoll ection?

E.g.

List<stringMyLi st = new List<string>;
MyList.Add("MyS tring");

So that:

MyList.Contains ("mystring")
MyList.Contains ("MyString")
MyList.Contains ("MYSTRING")

all return true.

Google shows plenty of examples of how to do this with Dictionary<stri ng,
stringcollectio ns e.g.

Dictionary<stri ng, stringMyDiction ary = new Dictionary<stri ng,
string>(StringC omparer.Current CultureIgnoreCa se);

but I can't find an equivalent for List<string>...

Any assistance gratefully received.

Mark

[Nicholas Paldino [.NET/C# MVP]]

Mark,

No, the List does not support any other comparison for Contains. You
will have to use the dictionary method to determine if you have a
case-insensitive string in your set.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Mark Rae" <ma**@markNOSPA Mrae.comwrote in message
news:Og******** ********@TK2MSF TNGP05.phx.gbl. ..

Hi,

Is it possible to create a case-insensitive List<stringcoll ection?

E.g.

List<stringMyLi st = new List<string>;
MyList.Add("MyS tring");

So that:

MyList.Contains ("mystring")
MyList.Contains ("MyString")
MyList.Contains ("MYSTRING")

all return true.

Google shows plenty of examples of how to do this with Dictionary<stri ng,
stringcollectio ns e.g.

Dictionary<stri ng, stringMyDiction ary = new Dictionary<stri ng,
string>(StringC omparer.Current CultureIgnoreCa se);

but I can't find an equivalent for List<string>...

Any assistance gratefully received.

Mark

[Andreas Mueller]

Mark Rae wrote:

Hi,

Is it possible to create a case-insensitive List<stringcoll ection?

E.g.

List<stringMyLi st = new List<string>;
MyList.Add("MyS tring");

So that:

MyList.Contains ("mystring")
MyList.Contains ("MyString")
MyList.Contains ("MYSTRING")

all return true.

Google shows plenty of examples of how to do this with Dictionary<stri ng,
stringcollectio ns e.g.

Dictionary<stri ng, stringMyDiction ary = new Dictionary<stri ng,
string>(StringC omparer.Current CultureIgnoreCa se);

but I can't find an equivalent for List<string>...

Any assistance gratefully received.

Mark

No, but you can get the information you need from a regular List<string>:

List<strings = new List<string>();
bool contains = null != s.Find(delegate (string str)
{
return str.ToLower().E quals("MyString ".ToLower() );
});
HTH,
Andy
--
You can email me directly by removing the NOSPAm below
xm**********@gm xNOSPAm.netNOSPAm

[Chris Taylor]

Hi,

Performing case-insensitive comparisons using ToLower/ToUpper are very
expensive, a much more efficient means is to use String.Compare. For some
non-English languages the ToLower solution is also not accurate/correct. See
my post on case-insensitive string comparisons:
http://dotnetjunkies.com/WebLog/chri.../07/21393.aspx

--
Chris Taylor
http://dotnetjunkies.com/weblog/chris.taylor
"Andreas Mueller" <[e-mail] wrote in message
news:4n******** ****@individual .net...

Mark Rae wrote:

>Hi,

Is it possible to create a case-insensitive List<stringcoll ection?

E.g.

List<stringMyL ist = new List<string>;
MyList.Add("My String");

So that:

MyList.Contain s("mystring")
MyList.Contain s("MyString")
MyList.Contain s("MYSTRING")

all return true.

Google shows plenty of examples of how to do this with Dictionary<stri ng,
stringcollecti ons e.g.

Dictionary<str ing, stringMyDiction ary = new Dictionary<stri ng,
string>(String Comparer.Curren tCultureIgnoreC ase);

but I can't find an equivalent for List<string>...

Any assistance gratefully received.

Mark

No, but you can get the information you need from a regular List<string>:

List<strings = new List<string>();
bool contains = null != s.Find(delegate (string str)
{
return str.ToLower().E quals("MyString ".ToLower() );
});
HTH,
Andy
--
You can email me directly by removing the NOSPAm below
xm**********@gm xNOSPAm.netNOSPAm

[Mark Rae]

"Chris Taylor" <ch************ *@hotmail.comwr ote in message
news:%2******** ********@TK2MSF TNGP02.phx.gbl. ..

Performing case-insensitive comparisons using ToLower/ToUpper are very
expensive, a much more efficient means is to use String.Compare. For some
non-English languages the ToLower solution is also not accurate/correct.
See my post on case-insensitive string comparisons:
http://dotnetjunkies.com/WebLog/chri.../07/21393.aspx

Thanks everyone.