How to add TimeSpans together using LINQ when in a Dictionary collection

问题

Is it possible to group up all equal keys in a Dictionary and add their corresponding TimeSpans together using LINQ?

Something like this (but this doesnt work)

var p = myDictionaryStringTimeStamp.Sum(x => x.Value.Add(myTimeStamp);

回答1:

You can do it with the Aggregate LINQ method like this:

var totalTime = myDictionaryStringTimeStamp
    .Values
    .Aggregate(new TimeSpan(0), (p, v) => p.Add(v));

来源：https://stackoverflow.com/questions/18455756/how-to-add-timespans-together-using-linq-when-in-a-dictionary-collection