LINQ从组中选择具有最大日期的列

Question

I have following table in which I can have multiple time stamps for a single name. I want to get the name (distinct) with max time stamp.

Id  Name    TimeStamp
66  Name1   19/10/2017
67  Name1   20/10/2017
68  Name1   21/10/2017
69  Name2   19/10/2017
70  Name2   20/10/2017
71  Name2   21/10/2017
72  Name2   22/10/2017
73  Name3   19/10/2017
74  Name3   20/10/2017
75  Name3   21/10/2017

I am able to do group by,now need to select the element with max value from that group.

 var tempResult = data.GroupBy(x => x.Name);

I tried doing this , nut it only selected the date time, but I need the complete item:

foreach (var item in tempResult)
            {
                var maxItem = item.Max(x=>x.StartTime);

            }

Answer 1

var result = from d in data
    group d by d.Name into g
    select new { Name = g.Key, MaxDate = g.Max(s => s.StartTime) }

Or if you do not like query syntax then:

data.GroupBy(i => i.Name).Select(g => new
{
    Name = g.Key,
    MaxDate = g.Max(row => row.StartTime)
});

Answer 2

@CodingYoshi's answer is enough if you just need Name and TimeStamp. If you want to select all other properties (full object) you can use this.

    var tempResult = data.GroupBy(x => x.Name)
        .Select(g => g.OrderByDescending(y => y.TimeStamp).FirstOrDefault());

if you like query form then this

    var tempResult2 = from x in data
                      group x by x.Name into g
                      select g.OrderByDescending(y => y.TimeStamp).FirstOrDefault();

Here in your case you can access all the properties (including ID).