EventHandlerDictionary and delegates c# decompiled

so i have came back recently to fivem after a year and m trying to recvoer my work or what is left
while i was fixing a script i wrote i ran into this issues wich im trying understand

     EventHandlerDictionary eventHandlers1 = this.EventHandlers;
      eventHandlers1["track"] = EventHandlerEntry.op_Addition(eventHandlers1["track"], 
     (Delegate)((id, position, item) => this.Createitem(id, position, item)); 

so long story short im looking for the equivalent of this line in cs
any help or pointer to the right direction is appreciated
thanks