LINQ contains and a Lambda query

Question

I have a List lt BuildingStatus gt  called buildingStatus  I d like to check whether it contains a status whose char code  returned by GetCharCode    equals some variable  v Status   Is there some way of doing this  along the lines of the  non-compiling  code below   buildingStatus Contains item   gt  item GetCharValue      v Status

User · Accepted Answer

Use Any   instead of Contains     buildingStatus Any item   gt  item GetCharValue      v Status

User · Answer

var depthead    from s in db M Users                   join m in db M User Types on s F User Type equals m UserType Id                   where m UserType Name ToUpper   Trim   Contains  quot DEPARTMENT HEAD quot                     select new  s FullName s F User Type s userId s UserCode                     OrderBy d   gt  d userId  ToList     Model AvailableDeptHead Add new SelectListItem   Text    quot Select quot   Value    quot 0 quot      for  int i   0  i  lt  depthead Count  i        Model AvailableDeptHead Add new SelectListItem   Text   depthead i  UserCode    quot  -  quot    depthead i  FullName  Value   Convert ToString depthead i  userId

User · Answer

I m not sure precisely what you re looking for  but this program       public class Building               public enum StatusType                       open              closed              weird                      public string Name   get  set            public StatusType Status   get  set               public static List  lt Building gt  buildingList   new List lt Building gt                   new Building      Name    one   Status   Building StatusType open            new Building      Name    two   Status   Building StatusType closed            new Building      Name    three   Status   Building StatusType weird             new Building      Name    four   Status   Building StatusType open            new Building      Name    five   Status   Building StatusType closed            new Building      Name    six   Status   Building StatusType weird                static void Main  string    args                var statusList   new List lt Building StatusType gt       Building StatusType open  Building StatusType closed             var q   from building in buildingList                 where statusList Contains  building Status                  select building           foreach   var b in q               Console WriteLine    0    1    b Name  b Status           produces the expected output    one  open two  closed four  open five  closed     This program compares a string representation of the enum and produces the same output       public class Building               public enum StatusType                       open              closed              weird                      public string Name   get  set            public string Status   get  set               public static List  lt Building gt  buildingList   new List lt Building gt                   new Building      Name    one   Status    open             new Building      Name    two   Status    closed             new Building      Name    three   Status    weird              new Building      Name    four   Status    open             new Building      Name    five   Status    closed             new Building      Name    six   Status    weird                 static void Main  string    args                var statusList   new List lt Building StatusType gt       Building StatusType open  Building StatusType closed            var statusStringList   statusList ConvertAll  lt string gt   st   gt  st ToString               var q   from building in buildingList                 where statusStringList Contains  building Status                  select building           foreach   var b in q               Console WriteLine    0    1    b Name  b Status            Console ReadKey               I created this extension method to convert one IEnumerable  to another  but I m not sure how efficient it is  it may just create a list behind the scenes   public static IEnumerable  lt TResult gt  ConvertEach  IEnumerable  lt TSource gt  sources  Func  lt TSource TResult gt  convert        foreach   TSource source in sources           yield return convert  source       Then you can change the where clause to   where statusList ConvertEach  lt string gt   status   gt  status GetCharValue         Contains  v Status    and skip creating the List lt string gt  with ConvertAll    at the beginning

User · Answer

Here is how you can use Contains to achieve what you want   buildingStatus Select item   gt  item GetCharValue    Contains v Status  this will return a Boolean value

User · Answer

If I understand correctly  you need to convert the type  char value  that you store  in Building list to the type  enum  that you store in buildingStatus list      For each status in the Building list  character value    does the status exists in the buildingStatus list  enum value     public static IQueryable lt Building gt  WithStatus this IQueryable lt Building gt  qry    IList lt BuildingStatuses gt  buildingStatus          return from v in qry            where ContainsStatus v Status             select v       private bool ContainsStatus v Status        foreach Enum value in Enum GetValues typeof buildingStatus                  If v Status    value GetCharValue                return true             return false

User · Answer

The Linq extension method Any could work for you     buildingStatus Any item   gt  item GetCharValue      v Status

[c#] LINQ: "contains" and a Lambda query

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