I have a lambda expression and I would like to get back the matched value. Here is an example:
if (Keywords.Any(s => sourceString.Contains(" " + s.Trim())))
return s;
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1you can use FirstGrundy– Grundy2014-07-29 12:03:48 +00:00Commented Jul 29, 2014 at 12:03
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4 Answers
Assuming you only want the first matched result (given you are using Any), you can use First / FirstOrDefault with a filter. Given there is a chance that there could be no matches, I would recommend using FirstOrDefault (First would throw an exception in that case).
var matched = Keywords.FirstOrDefault(s => sourceString.Contains(" " + s.Trim()));
Comments
Keywords.First(s => sourceString.Contains(" " + s.Trim()))
Take a look to Single, SingleOrDefault, First or FirstOrDefault extension methods, depending by the behavior you want.
If you want to get the collection of matching items:
Keywords.Where(s => sourceString.Contains(" " + s.Trim())).ToList()
2 Comments
James
Well you wouldn't want
Single / SingleOrDefault here because there is a chance there could be duplicate entries.
sslazio1900
Correct! In fact i wrote my example with "First"... but not knowing the start collection i've exposed all the similar methods ;)
You can use .First or .FirstOrDefault for this.
But .First will throw an Exception if nothing is found.
var s = Keywords.FirstOrDefault(keyword => sourceString.Contains(" " + keyword .Trim()));
return s;
Comments
How about:
return Keywords.FirstOrDefault(s => sourceString.Contains(" " + s.Trim()));
This returns the match if found and null if it wasn't found.
Beware of doing this against a database though - .Contains will likely translate to an inefficient query using LIKE. Investigate full-text indexing if that's the case.
1 Comment
James
In most cases,
Contains won't even be supported by the provider.