[英]How can I rewrite this code to LINQ?
我有以下非常丑陋的代碼,我想用一些不錯的LINQ重寫它,但我無法弄清楚:
var folders = new List<string>();
string folderResult = "";
foreach (var parallelMeasurement in ParallelMeasurements)
{
var folder = parallelMeasurement.Item1.Substring(0, parallelMeasurement.Item1.IndexOf("."));
if (!folders.Contains(folder))
{
folders.Add(folder);
folderResult += folder + ",";
}
}
folderResult = folderResult.TrimEnd(',');
string valueResult = "";
foreach (var folder in folders)
{
var views = ParallelMeasurements.Where(x => x.Item1.Substring(0, x.Item1.IndexOf(".")) == folder);
var value = views.Sum(x => x.Item2.TotalSeconds);
valueResult += value + ",";
}
valueResult = valueResult.TrimEnd(',');
File.WriteAllText(Paths.ParallelGroupedTrend, $"{folderResult}{Environment.NewLine}{valueResult}");
ParallelMeasurements
是List<Tuple<string, TimeSpan>>
並且tuple.Item1的內容例如:
Actor.ActorUsers
Actor.ActorInformation
User.Edit
簡而言之,我想基於字符串的第一部分,即句點之前的內容,匯總度量。
這應該怎么辦?
ParallelMeasurements.Add(new Tuple<string, TimeSpan>("Actor.ActorUsers", TimeSpan.FromMilliseconds(150)));
ParallelMeasurements.Add(new Tuple<string, TimeSpan>("Actor.ActorInformation", TimeSpan.FromMilliseconds(200)));
ParallelMeasurements.Add(new Tuple<string, TimeSpan>("User.Edit", TimeSpan.FromMilliseconds(150)));
var folders =
ParallelMeasurements
.GroupBy(g => g.Item1.Substring(0, g.Item1.IndexOf(".", StringComparison.InvariantCulture)))
.Select(s => new { Group = s.Key, Sum = s.Sum(a => a.Item2.Milliseconds) })
.ToList();
var folderResult = string.Join(",", folders.Select(f => f.Group));
var valueResult = string.Join(",", folders.Select(f => f.Sum));
Console.WriteLine("{0}{1}{2}", folderResult, Environment.NewLine, valueResult);
打印輸出
Actor,User
350,150
像這樣:
var folders = new List<string>();
foreach (var parallelMeasurement in ParallelMeasurements)
{
folders.Add(parallelMeasurement.Item1.Substring(0, parallelMeasurement.Item1.IndexOf(".")));
}
string folderResult = String.Join(',', folders.Disctint().toList());
var values = new List<int>();
foreach (var folder in folders)
{
values.Add(ParallelMeasurements.Where(x => x.Item1.Substring(0, x.Item1.IndexOf(".")) == folder).Sum(x => x.Item2.TotalSeconds));
}
string valueResult = String.Join(',', values);
LINQ可以嗎? 是。 少丑? 值得商!!
List<string> folders = new List<string>();
string folderResult = string.Join(",", ParallelMeasurements
.Select(parallelMeasurement => parallelMeasurement.Item1.Substring(0, parallelMeasurement.Item1.IndexOf(".")))
.Where(folder => folders.Contains(folder))
.Select(folder =>
{
folders.Add(folder);
return folder;
}));
string valueResult = string.Join(",", folders
.Select(folder => ParallelMeasurements
.Where(parallelMeasurement => parallelMeasurement.Item1.Substring(0, parallelMeasurement.Item1.IndexOf(".")) == folder))
.Select(views => views.Sum(view => view.Item2.TotalSeconds)));
var folders = new List<string>();
string folderResult = "";
foreach (var folder in ParallelMeasurements.Select(parallelMeasurement => parallelMeasurement.
Item1.Substring(0, parallelMeasurement.Item1.IndexOf("."))).
Where(folder => !folders.Contains(folder)))
{
folders.Add(folder);
folderResult += folder + ",";
}
folderResult = folderResult.TrimEnd(',');
string valueResult = folders.Select(folder => ParallelMeasurements.
Where(x => x.Item1.Substring(0, x.Item1.IndexOf(".")) ==
folder)).Select(views => views.Sum(x => x.Item2.TotalSeconds)).Aggregate("", (current, value) => current + (value + ","));
valueResult = valueResult.TrimEnd(',');
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