Thread: Enum List problem

  1. #1
    Registered User
    Join Date
    Jun 2009

    Enum List problem


    I'm trying to use .exists on list of enums but am getting the following error when trying to pass the value of the enumaerated constant:
    "The best overloaded method match for 'System.Collections.Generic.List<TenderLib_v0._1.T enderOutcome>.Exists(System.Predicate<TenderLib_v0 ._1.TenderOutcome>)' has some invalid arguments"

    Can someone pleas give me a pointer?

    public enum TenderOutcome
            Undetermined = 0,
            Won = 1,
            Lost = 2        
    internal void setOutcome(int o)
    List<TenderOutcome> valuesList= new List<TenderOutcome>();
                valuesList = this.OutcomeList; //OutcomeList just returns the values of type TenderOutcome from a dictionary
                foreach (TenderOutcome tender in valuesList)
                if (!(valuesList.Exists(TenderOutcome.Won)) || (valuesList.Exists(TenderOutcome.Lost)))

  2. #2
    Confused Magos's Avatar
    Join Date
    Sep 2001
    Exists() expects a predicate (takes an enum, returns a bool). You pass the enum directly.
    Use this instead:
    .Exists(Value => (Value == TenderOutcome.Won))
    However it's probably better to use the Contains method:

    Give a man a fish and you feed him for a day.
    Teach a man to fish and you feed him for a lifetime.

  3. #3
    Registered User
    Join Date
    Jun 2009
    Great stuff!

    In the last hour I wrote an extra class to get .Exist to work like .Contains :/

    public bool Check(List<TenderOutcome> outcomeList, int outcome)
                if (OutcomeList.Exists(delegate(TenderOutcome x) { return x.Equals(outcome); }))
                { return true; }
                else return false;

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