List <group <string，string =“”>＆gt;中的组日期

Question

我有一个函数来执行返回我的SQL查询

List<Dictionary<string, string>>

第一个元素是字段，第二个元素是值。

在特定情况下，此列表具有以下值：

{ datetime, '01/23/2017 01:10:30' }
{ datetime, '01/23/2017 10:00:00' }
{ datetime, '01/23/2017 11:23:15' }
{ datetime, '01/20/2017 07:13:20' }
{ datetime, '01/20/2017 08:20:11' }
{ datetime, '01/21/2017 07:28:29' }

我需要将其转换为：

{ '01/23/2017', { '01/23/2017 01:10:30', ''01/23/2017 10:00:00', '01/23/2017  11:23:15' } }
{ '01/20/2017', { '01/20/2017 07:13:20', '01/20/2017 08:20:11' } }
{ '01/21/2017', { '01/21/2017 07:28:29' } }

我该如何处理？

Answer 1

根据您提供的数据，这是一种方法。请注意，此代码是在LinqPad中编写和执行的，因此.Dump()仅适用于此处：

var source = new List<KeyValuePair<string, string>> {
    new KeyValuePair<string, string>( "datetime", "01/23/2017 01:10:30") ,
    new KeyValuePair<string, string>( "datetime", "01/23/2017 10:00:00" ),
    new KeyValuePair<string, string>( "datetime", "01/23/2017 11:23:15" ),
    new KeyValuePair<string, string>( "datetime", "01/20/2017 07:13:20" ),
    new KeyValuePair<string, string>( "datetime", "01/20/2017 08:20:11" ),
    new KeyValuePair<string, string>( "datetime", "01/21/2017 07:28:29" )
};

var list = source.Select (s => s.Value)
    .GroupBy (s => DateTime.ParseExact(s, "MM/dd/yyyy hh:mm:ss", CultureInfo.InvariantCulture).Date)
    .ToList();

list.Dump();

输出：