Is string in array

Question

What would be the best way to look in a string   to see if it contains a element  This was my first shot at it  But perhaps there is something that I am overlooking  The array size will be no larger than 200 elements   bool isStringInArray string   strArray  string key        for  int i   0  i  lt   strArray Length - 1  i            if  strArray i     key              return true      return false

User · Answer

Linq  for s amp g s    var test    This is the string I m looking for   var found   strArray Any x  gt x    test     or  depending on requirements  var found   strArray Any      x  gt x Equals test  StringComparison OrdinalIgnoreCase

User · Answer

This is quicker than iterating through the array manually   static bool isStringInArray string   strArray  string key                 if  strArray Contains key               return true          return false

User · Answer

This is quicker than iterating through the array manually   static bool isStringInArray string   strArray  string key                 if  strArray Contains key               return true          return false

User · Answer

If you don t want to or simply can t use Linq you can also use the static Array Exists       function   https   msdn microsoft com en-us library yw84x8be 28v vs 110 29 aspx f 255 amp MSPPError -2147217396  var arr   new string    bird   foo   cat   dog     var catInside   Array Exists     arr     your Array    s   gt   return s     cat        the Predicate      When the Predicate do return true once catInside will be true as well

User · Answer

Just use the already built-in Contains   method   using System Linq          string   array      foo    bar     if  array Contains  foo

User · Answer

Linq  for s amp g s    var test    This is the string I m looking for   var found   strArray Any x  gt x    test     or  depending on requirements  var found   strArray Any      x  gt x Equals test  StringComparison OrdinalIgnoreCase

User · Answer

You can also use LINQ to iterate over the array  or you can use the Find method which takes a delegate to search for it  However I think the find method is a bit more expensive then just looping through

User · Answer

Just use the already built-in Contains   method   using System Linq          string   array      foo    bar     if  array Contains  foo

User · Answer

Arrays are  in general  a poor data structure to use if you want to ask if a particular object is in the collection or not   If you ll be running this search frequently  it might be worth it to use a Dictionary lt string  something gt  rather than an array  Lookups in a Dictionary are O 1   constant-time   while searching through the array is O N   takes time proportional to the length of the array    Even if the array is only 200 items at most  if you do a lot of these searches  the Dictionary will likely be faster

User · Answer

Just use the already built-in Contains   method   using System Linq          string   array      foo    bar     if  array Contains  foo

User · Answer

Arrays are  in general  a poor data structure to use if you want to ask if a particular object is in the collection or not   If you ll be running this search frequently  it might be worth it to use a Dictionary lt string  something gt  rather than an array  Lookups in a Dictionary are O 1   constant-time   while searching through the array is O N   takes time proportional to the length of the array    Even if the array is only 200 items at most  if you do a lot of these searches  the Dictionary will likely be faster

User · Answer

Arrays are  in general  a poor data structure to use if you want to ask if a particular object is in the collection or not   If you ll be running this search frequently  it might be worth it to use a Dictionary lt string  something gt  rather than an array  Lookups in a Dictionary are O 1   constant-time   while searching through the array is O N   takes time proportional to the length of the array    Even if the array is only 200 items at most  if you do a lot of these searches  the Dictionary will likely be faster

User · Answer

As mentioned many times in the thread above  it s dependent on the framework in use   Net Framework 3 and above has the  Contains   or Exists   methods for arrays  For other frameworks below  can do the following trick instead of looping through array       IList lt string gt   Your String Array Here   Contains  Your Search String Here     Not too sure on efficiency    Dave

User · Answer

Linq  for s amp g s    var test    This is the string I m looking for   var found   strArray Any x  gt x    test     or  depending on requirements  var found   strArray Any      x  gt x Equals test  StringComparison OrdinalIgnoreCase

User · Answer

You can also use LINQ to iterate over the array  or you can use the Find method which takes a delegate to search for it  However I think the find method is a bit more expensive then just looping through

User · Answer

You re simply after the Array Exists function  or the Contains extension method if you re using  NET 3 5  which is slightly more convenient

User · Answer

You re simply after the Array Exists function  or the Contains extension method if you re using  NET 3 5  which is slightly more convenient

User · Answer

This is quicker than iterating through the array manually   static bool isStringInArray string   strArray  string key                 if  strArray Contains key               return true          return false

User · Answer

I know this is old  but I wanted the new readers to know that there is a new method to do this using generics and extension methods   You can read my blog post to see more information about how to do this  but the main idea is this   By adding this extension method to your code   public static bool IsIn lt T gt  this T source  params T   values        return values Contains source       you can perform your search like this   string myStr    str3    bool found   myStr IsIn  str1    str2    str3    str4      It works on any type  as long as you create a good equals method    Any value type for sure

User · Answer

Is the array sorted   If so you could do a binary search   Here is the  NET implementation as well   If the array is sorted then a binary search will improve performance over any iterative solution

User · Answer

I know this is old  but I wanted the new readers to know that there is a new method to do this using generics and extension methods   You can read my blog post to see more information about how to do this  but the main idea is this   By adding this extension method to your code   public static bool IsIn lt T gt  this T source  params T   values        return values Contains source       you can perform your search like this   string myStr    str3    bool found   myStr IsIn  str1    str2    str3    str4      It works on any type  as long as you create a good equals method    Any value type for sure

User · Answer

You can also use LINQ to iterate over the array  or you can use the Find method which takes a delegate to search for it  However I think the find method is a bit more expensive then just looping through

User · Answer

As mentioned many times in the thread above  it s dependent on the framework in use   Net Framework 3 and above has the  Contains   or Exists   methods for arrays  For other frameworks below  can do the following trick instead of looping through array       IList lt string gt   Your String Array Here   Contains  Your Search String Here     Not too sure on efficiency    Dave

User · Answer

You re simply after the Array Exists function  or the Contains extension method if you re using  NET 3 5  which is slightly more convenient

User · Answer

Arrays are  in general  a poor data structure to use if you want to ask if a particular object is in the collection or not   If you ll be running this search frequently  it might be worth it to use a Dictionary lt string  something gt  rather than an array  Lookups in a Dictionary are O 1   constant-time   while searching through the array is O N   takes time proportional to the length of the array    Even if the array is only 200 items at most  if you do a lot of these searches  the Dictionary will likely be faster

User · Answer

Is the array sorted   If so you could do a binary search   Here is the  NET implementation as well   If the array is sorted then a binary search will improve performance over any iterative solution

User · Answer

Just use the already built-in Contains   method   using System Linq          string   array      foo    bar     if  array Contains  foo

User · Answer

Linq  for s amp g s    var test    This is the string I m looking for   var found   strArray Any x  gt x    test     or  depending on requirements  var found   strArray Any      x  gt x Equals test  StringComparison OrdinalIgnoreCase

User · Answer

This is quicker than iterating through the array manually   static bool isStringInArray string   strArray  string key                 if  strArray Contains key               return true          return false

User · Answer

Is the array sorted   If so you could do a binary search   Here is the  NET implementation as well   If the array is sorted then a binary search will improve performance over any iterative solution

User · Answer

You can also use LINQ to iterate over the array  or you can use the Find method which takes a delegate to search for it  However I think the find method is a bit more expensive then just looping through

User · Answer

If you don t want to or simply can t use Linq you can also use the static Array Exists       function   https   msdn microsoft com en-us library yw84x8be 28v vs 110 29 aspx f 255 amp MSPPError -2147217396  var arr   new string    bird   foo   cat   dog     var catInside   Array Exists     arr     your Array    s   gt   return s     cat        the Predicate      When the Predicate do return true once catInside will be true as well

User · Answer

Is the array sorted   If so you could do a binary search   Here is the  NET implementation as well   If the array is sorted then a binary search will improve performance over any iterative solution

User · Answer

You re simply after the Array Exists function  or the Contains extension method if you re using  NET 3 5  which is slightly more convenient

[c#] Is string in array?

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