Question

我有一个包含以下字段的表：

动作=＆gt;点击/开启
DateTime =＆gt;日期和时间行动发生

示例：

行动|日期时间

点击| 3/12/2010 3:00 AM
点击| 3/12/2010 3:12 AM
打开| 3/12/2010 3:34 AM
点击| 2010年3月12日上午4:12
点击| 2010年3月13日下午1:12

等。

我需要按小时对这些进行分组，以便每小时点击一次并按小时打开。

Answer 1

var poo = new[]
                {
                    new
                        {
                            Type = "Click",
                            Time = DateTime.Parse("March 12, 2010 3:00AM")
                        },
                    new
                        {
                            Type = "Click",
                            Time = DateTime.Parse("March 12, 2010 3:12AM")
                        },
                    new
                        {
                            Type = "Open",
                            Time = DateTime.Parse("March 12, 2010 3:34AM")
                        },
                    new
                        {
                            Type = "Click",
                            Time = DateTime.Parse("March 12, 2010 4:12AM")
                        },
                    new
                        {
                            Type = "Click",
                            Time = DateTime.Parse("March 13, 2010 1:12PM")
                        }
                };

var result = from s in poo
                group s by new {s.Type, s.Time.Hour} into  p

                select new
                        {
                            p.Key.Type,
                            p.Key.Hour,
                            Count = p.Count()
                        };

foreach (var s in result)
{
    Console.WriteLine(s.Count + " - " + s.Type + " - " + s.Hour);
}

输出：

2 - Click - 3
1 - Open - 3
1 - Click - 4
1 - Click - 13

那你在寻找什么？

Answer 2

你可以使用lambda

这样做

 var data = new[]
                  {
                        new { Actn = "click", tm = "3/12/2010 3:00AM" },
                        new { Actn = "click"  , tm = "3/12/2010 3:12AM"},
                        new { Actn = "open"  , tm = "3/12/2010 3:34AM"},
                        new { Actn = "click"  , tm = "3/12/2010 4:12AM"},
                        new { Actn = "click"  , tm = "3/13/2010 1:12PM"}
                  };

            var groupby = data.GroupBy(r => new { Convert.ToDateTime(r.tm).Hour, r.Actn });

            foreach (var group in groupby)
            {
                Console.WriteLine("{0} = {1}", group.Key, group.Count());
            }

Answer 3

我这样解决了：

        List<MySummary> summary =
            entries.Select(i => new { i, dt = i.Date }).GroupBy(
                @t => new { date = @t.dt.Date, time = @t.dt.Hour }, @t => @t.i).Select(
                    g =>
                    new MySummary()
                        {
                            Date = g.Key.date.AddHours(g.Key.time),
                            Opens = g.Count(x => x.Type == "Open"),
                            Clicks = g.Count(x => x.Type == "Click")
                        }).ToList();

如果你们认为这是不正确的，请告诉我。但是从它的外观来看......它能获得正确的数据。

型号：

    public class MySummary
{
    public DateTime Date { get; set; }

    public int Opens { get; set; }

    public int Clicks { get; set; }
}

按小时和类型划分的LINQ组（点击/打开比率）

3 个答案: