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Trick when using Array.Contains()

By , 13 Jun 2011
 

The Array class already contains this capability with no casting required. The IndexOf method is a static one that returns the index of the value and a -1 if it doesn't exist.

Here is an example:

exists = Array.IndexOf(arr, "item") >= 0

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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GeneralSimpler and nice one. If we do not want exact matching and i...memberMohammad A Rahman27 Jun '11 - 18:48 
Simpler and nice one. If we do not want exact matching and ignore case, then probably could use something like
string[] newArray = new string[]{ "A", "B", "C" };
bool result = newArray.Contains("a", StringComparer.OrdinalIgnoreCase); or if we consider the case then,
bool result = newArray.Contains("A");
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GeneralReason for my vote of 1 Could be problem when finding word i...groupsachin10d20 Jun '11 - 21:56 
Reason for my vote of 1
Could be problem when finding word in string
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GeneralRe: You are incorrect. Try this: string[] arr = new[] {"item4", ...memberJV999920 Jun '11 - 22:23 
You are incorrect. Try this:
string[] arr = new[] {"item4", "test", "item 3", "item", "beer"};
 
int index = Array.IndexOf(arr, "item");
bool exists = Array.IndexOf(arr, "item") >= 0;
 
The returned index will always be 3 and if you remove "item", the index will be -1.
 
Voted 5 for this solution. Very elegant, I wouldn't have thought of that method Smile | :)
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GeneralReason for my vote of 5 This alternative is even nicer. Than...memberw.a.g.i20 Jun '11 - 20:02 
Reason for my vote of 5
This alternative is even nicer. Thanks!
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GeneralReason for my vote of 5 Simpler and just as clear.memberBen Robbins20 Jun '11 - 14:52 
Reason for my vote of 5
Simpler and just as clear.
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GeneralArray.IndexOf(arr, "item") >= 0 This will return the exact m...memberKiran Sonawane13 Jun '11 - 4:00 
Array.IndexOf(arr, "item") >= 0 This will return the exact match
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About Article
The Array class already contains this capability with no casting required. The IndexOf method is a static one that returns the index of the value and a -1 if it doesn't exist.Here is an example:exists = Array.IndexOf(arr, "item") >= 0
Type Tip/Trick
Licence CPOL
First Posted 13 Jun 2011
Views 2,106
Bookmarked 5 times
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