I have two lists
List<string> ingoreEducationKeywords= new List<string>(){"Uni", "School", "College",};
List<string> userEducation= new List<string>(){"MCS", "BCS", "School of Arts","College of Medicine"};
Now I want to get a list which has no substring from the ignore list.
require list {"MCS", "BCS"}
That's a relatively straightforward query that can be constructed with Any or All, depending on your preferences:
var res = userEducation
.Where(s => !ingoreEducationKeywords.Any(ignored => s.Contains(ignored)))
.ToList();
or
var res = userEducation
.Where(s => ingoreEducationKeywords.All(ignored => !s.Contains(ignored)))
.ToList();
If the lists are very large, you could improve performance by using regex to match all words simultaneously:
var regex = new Regex(
string.Join("|", ingoreEducationKeywords.Select(Regex.Escape))
);
var res = userEducation.Where(s => !regex.IsMatch(s)).ToList();
It's a matter of phrasing what you want in a way that leads to a natural translation into LINQ:
userEducation (that suggests you'll start with userEducation)ignoreEducationKeywords are substrings.
ContainsThat leads to:
var query = userEducation
.Where(candidate => !ignoredKeyWords.Any(ignore => candidate.Contains(ignore)));
The same thought process can help in many other queries.
Another option would be to create your own None extension method, assuming you're using LINQ to Objects:
public static class Extensions
{
public static bool None(this IEnumerable<T> source, Func<T, bool> predicate)
=> !source.Any(predicate);
}
Then you could rewrite the query without the negation:
var query = userEducation
.Where(candidate => ignoredKeyWords.None(ignore => candidate.Contains(ignore)));
You can use Where, Any and Contains:
var list = userEducation.Where(ed => !ingoreEducationKeywords.Any(ik => ed.Contains(ik)));
It searches all occurences in userEducation where the education does not have any match in ingoreEducationKeywords.
)
List<string> ingoreEducationKeywords = new List<string>() { "Uni", "School", "College", };
List<string> userEducation = new List<string>() { "MCS", "BCS", "School of Arts", "College of Medicine" };
var result = userEducation.Where(r => !ingoreEducationKeywords.Any(t => r.Contains(t))).ToList();
userEducation.Where(e => ignoreEducationKeywords.All(i => !e.Contains(i)))