Linq groupby IdCordinator only if categery type count greater than one -

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need group records idcordinator, conditions

  1. if category type not equal "s", include in group
  2. if category type "s" for particular coordinator , count greater than 1 include in group
  3. if category type "s" a particular coordinator , count equal 1 not include in group

how should frame clause. if have clause below, if there 1 element list though not of category "s" returns 0 records.

using system;

using system.collections.generic; using system.linq;

namespace linqgroupbywhere { class program { static void main( string[] args ) { studentlist studentlist = new studentlist(); studentlist.getlist(); console.readkey(); } }

public class studentlist {     public void getlist()     {          list<students> stdlst = new list<students>();         stdlst.add( new students( "stud1", 20, "m", "i001" ) );         stdlst.add( new students( "stud2", 20, "m", "i001" ) );         stdlst.add( new students( "stud3", 20, "m", "i002" ) );         stdlst.add( new students( "stud4", 20, "m", "i003" ) );         stdlst.add( new students( "stud5", 20, "s", "i001" ) );         stdlst.add( new students( "stud6", 20, "s", "i001" ) );         stdlst.add( new students( "stud7", 20, "s", "i002" ) );          var lst = stdlst.groupby( s => s.idcordinator )      .selectmany( sg =>             sg.where( s => !s.category.equals( "s" ) || sg.count( c => c.category.equals( "s" ) ) > 1 )            .select( student => student.name ) )            .orderby( o => o );          console.writeline( string.join( ",", (string[]) lst.toarray() ) );       } } public class students {      public students( string name, int age, string cat, string sicordinator )     {         this.name = name;         this.age = age;         this.category = cat;         this.idcordinator = idcordinator;     }     public string name     {         get;         set;     }     public int age     {         get;         set;     }     public string category     {         get;         set;     }     public string idcordinator     {         get;         set;     } }

}

you can write output want : 

var lst = stdlst.groupby(s => s.idcordinator)          .selectmany(sg =>                 sg.where(s => !s.category.equals("s") || sg.count(c => c.category.equals("s")) > 1)                .select(student => student.name))                .orderby(o => o);

hope solves problem.

update constructor : 

public students( string name, int age, string cat, string sicordinator ) {     this.name = name;     this.age = age;     this.category = cat;     this.idcordinator = sicordinator; // assiging same field here, making null }

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