Check if list contains element that contains a string and get that element

Question

While searching for an answer to this question  I ve run into similar ones utilizing LINQ but I haven t been able to fully understand them  and thus  implement them   as I m not familiarized with it  What I would like to  basically  is this    Check if any element of a list contains a specific string  If it does  get that element    I honestly don t know how I would go about doing that  What I can come up with is this  not working  of course    if  myList Contains myString       string element   myList ElementAt myList IndexOf myString      I know WHY it does not work    myList Contains   does not return true  since it will check for if a whole element of the list matches the string I specified  myList IndexOf   will not find an occurrence  since  as it is the case again  it will check for an element matching the string    Still  I have no clue how to solve this problem  but I figure I ll have to use LINQ as suggested in similar questions to mine  That being said  if that s the case here  I d like for the answerer to explain to me the use of LINQ in their example  as I said  I haven t bothered with it in my time with C    Thank you in advance guys  and gals     EDIT  I have come up with a solution  just loop through the list  check if current element contains the string and then set a string equal to the current element  I m wondering  though  is there a more efficient way than this   string myString    bla   string element        for  int i   0  i  lt  myList Count  i          if  myList i  Contains myString           element   myList i

User · Answer

string result   myList FirstOrDefault x   gt  x    myString  if result    null        found

User · Answer

If you want a list of strings containing your string   var newList   myList Where x   gt  x Contains myString   ToList      Another option is to use Linq FirstOrDefault  var element   myList Where x   gt  x Contains myString   FirstOrDefault      Keep in mind that Contains method is case sensitive

User · Answer

I have not seen bool option in other answers so I hope below code will help someone   Just use Any    string myString    test   bool exists   myList               Where w   gt  w COLUMN TO CHECK Contains myString   Any

User · Answer

You should be able to use something like this  it has worked okay for me   var valuesToMatch   yourList Where stringCheck   gt  stringCheck Contains myString      or something like this  if you need to look where it doesn t match    var valuesToMatch   yourList Where stringCheck   gt   stringCheck Contains myString

User · Answer

for  int i   0  i  lt  myList Length  i          if  myList i  Contains myString       you use the word  contains   either equals or indexof might be appropriate                return i            Old fashion loops are almost always the fastest

User · Answer

It is possible to combine Any  Where  First and FirstOrDefault  or just place the predicate in any of those methods depending on what is needed  You should probably avoid using First unless you want to have an exception thrown when no match is found  FirstOrDefault is usually the better option as long as you know it will return the type s default if no match is found  string s default is null  int is 0  bool is false  etc   using System Collections Generic  using System Linq    bool exists  string firstMatch  IEnumerable lt string gt  matchingList   var myList   new List lt string gt       quot foo quot    quot bar quot    quot foobar quot      exists   myList Any x   gt  x Contains  quot o quot        exists   gt  true  firstMatch   myList FirstOrDefault x   gt  x Contains  quot o quot     firstMatch   myList First x   gt  x Contains  quot o quot        firstMatch   gt   quot foo quot   firstMatch   myList First x   gt  x Contains  quot dark side quot        throws exception because no element contains  quot dark side quot   firstMatch   myList FirstOrDefault x   gt  x Contains  quot dark side quot        firstMatch   gt  null  matchingList   myList Where x   gt  x Contains  quot o quot         matchingList   gt     quot foo quot    quot foobar quot     Test this code   https   rextester com TXDL57489

User · Answer

you can use  var match myList Where item  gt item Contains  Required String     foreach var i in match      do something with the matched items     LINQ provides you with capabilities to  query  any collection of data  You can use syntax like a database query  select  where  etc  on a collection  here the collection  list  of strings    so you are doing like  get me items from the list Where it satisfies a given condition   inside the Where you are using a  lambda expression   to tell briefly lambda expression is something like  input parameter    return value   so for a parameter  item   it returns  item Contains  required string      So it returns true if the item contains the string and thereby it gets selected from the list since it satisfied the condition

User · Answer

The basic answer is  you need to iterate through loop and check any element contains the specified string  So  let s say the code is   foreach string item in myList        if item Contains myString          return item      The equivalent  but terse  code is   mylist Where x   gt  x Contains myString   FirstOrDefault      Here  x is a parameter that acts like  item  in the above code

User · Answer

You could use Linq s FirstOrDefault extension method   string element   myList FirstOrDefault s   gt  s Contains myString      This will return the fist element that contains the substring myString  or null if no such element is found   If all you need is the index  use the List lt T gt  class s FindIndex method   int index   myList FindIndex s   gt  s Contains myString      This will return the the index of fist element that contains the substring myString  or -1 if no such element is found

User · Answer

Many good answers here  but I use a simple one using Exists  as below   foreach  var setting in FullList        if cleanList Exists x   gt  x ProcedureName    setting ProcedureName           setting IsActive   true     do you business logic here      else        setting IsActive   false      updateList Add setting

User · Answer

To keep it simple use this   foreach string item in myList   Iterate through each item     if item Contains  Search Term    True if the item contains search pattern        return item   Return the matched item         Alternatively to do this with for loop use this       for  int iterator   0  iterator  lt  myList Count  iterator                  if  myList iterator  Contains  String Pattern                          return myList iterator

User · Answer

You should be able to use Linq here   var matchingvalues   myList      Where stringToCheck   gt  stringToCheck Contains myString      If you simply wish to return the first matching item   var match   myList      FirstOrDefault stringToCheck   gt  stringToCheck Contains myString     if match    null        Do stuff

[c#] Check if list contains element that contains a string and get that element

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