Fastest way to count a collection whilst applying criteria

I have a dictionary that i have already loaded form the database which contains a customer oject key and a Status value which is an Enum. What I would like to do is to count all the items in the dictionary which have a status of a certain enum type ie "Sent". What would be the best way to go about this without going back to the database,开发者_Go百科 or do i have to go back to the database? I dont really want to loop round the whole collection. I cant use linq as im currently using .Net 2.0

public Dictionary<Customer, Status> DistributionList

Many thanks in advance.

If you need a count of elements in the dictionary with the specific value, you can't avoid looping though the list:

int count = 0;
foreach(KeyValuePair<Customer,Status> kvp in DistributionList) {
    if(kvp.Value == Status.Sent) count++;
}

Could you use a lambda function? e.g.:

using System.Linq;

int sentCount = DistributionList.Values.Count(s => s.Status == sent);