CODEWITHSUNDEEP
c#arrayslinqdictionary
MwBakker
MwBakker

Reputation: 495

comparison goes faulty c# Dictionary<String, string[]>

Good day all,

I have a Dictionary<String, String[])>, with a key => value example like the following: 

{ "Eten/drinken", new string[] { "canteen", "mcdonald's", "mimi" } }

I need to compare a string part with one of the values of the Dictionary: 

 if (categories.Any(x => x.Value.Contains(part))) {
        category = categories.FirstOrDefault(x => x.Value.Contains(part)).Key;
 }

In one scenario part = "mcdonald's veghel veghel", which makes the comparison with the Dictionary value come back false.

Why is it false? "mcdonald's veghel veghel" does contain mcdonald's and zero-space comparisons do go the way they should.

Upvotes: 1

Views: 128

Answers (2)

sujith karivelil
sujith karivelil

Reputation: 29026

Actually the String.Contains method will check for any specified subsring present in the given string. unfortunately there is no x.Value that contains the given string, whereas the given values contains item/s of x.Value, so you have to change your query like the following:

var collectionResult = categories.FirstOrDefault(x => x.Value.Any(s=> part.Contains(s)));
if(collectionResult != null)
{
   var selectedKey =  collectionResult.Key;
}

Upvotes: 2

Sergey Kalinichenko
Sergey Kalinichenko

Reputation: 726669

Expression inside lambda x.Value.Contains(part) means that any of the elements of {"canteen", "mcdonald's", "mimi"} contains the string "mcdonald's veghel veghel", which is false. You wanted the inverse of the condition, i.e. where the long string part contains any of the keywords from your list:

categories.Any(x => x.Value.Any(s => part.Contains(s)))

Upvotes: 3

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