c# - OrderBy ignoring accented letters -

i want method orderby() orders ignoring accented letters , @ them non-accented. tried override orderby() seems can't because static method.

so want create custom lambda expression orderby(), this:

public static iorderedenumerable<tsource> toorderby<tsource, tkey>(     ienumerable<tsource> source, func<tsource, tkey> keyselector) {     if(source == null)         return null;      var seenkeys = new hashset<tkey>();      var culture = new cultureinfo("pt-pt");     return source.orderby(element => seenkeys.add(keyselector(element)),                            stringcomparer.create(culture, false)); }  

however, i'm getting error:

error 2 type arguments method 'system.linq.enumerable.orderby<tsource,tkey>(system.collections.generic.ienumerable<tsource>, system.func<tsource,tkey>, system.collections.generic.icomparer<tkey>)' cannot inferred usage. try specifying type arguments explicitly.

seems doesn't stringcomparer. how can solve this?

note:

i tried use removediacritics() here don't know how use method in case. tried this seems nice too.

orderby takes keyselector first argument. keyselector should func<string,t>. need method takes string , returns value enumeration should sorted.

unfortunatly i'm not sure how determine if character "accented letter". removediacritics doesn't work é.

so let's assume have method called isaccentedletter determines if character accented letter:

public bool isaccentedletter(char c) {     // i'm afraid not job     return charunicodeinfo.getunicodecategory(c) == unicodecategory.nonspacingmark; } 

so can sort list that:

string[] mystrings = getstrings(); // whereever strings come var ordered = mystrings.orderby(s => new string(s.select(c =>      isaccentedletter(c) ? ' ' : c).toarray()), stringcomparer.create(culture, false)); 

the lambda expression takes string , returns same string, replaced accented letters empty space.
orderby sorts enumeration these strings, , "ignores" accented letters.

update: if have working method removediacritics(string s) returns strings accented letters replaced want, may call orderby this:

string[] mystrings = getstrings(); var ordered = mystrings.orderby(removediacritics, stringcomparer.create(culture, false));