.NET[C#]如何将LINQ查询出来的结果转换成字典(Dictionary)？

.NET[C#]如何将LINQ查询出来的结果转换成字典(Dictionary)？

问题描述

如何实现类似这样的将LINQ查询的结果转换成字典：

Dictionary<int, DateTime> existingItems = 
    (from ObjType ot in TableObj
        select (new KeyValuePair<int, DateTime>(ot.Key, ot.TimeStamp))
    )

方案一

var dict = TableObj.Select( t => new { t.Key, t.TimeStamp } )
                   .ToDictionary( t => t.Key, t => t.TimeStamp );

方案二

Dictionary<int, DateTime> existingItems = 
    (from ObjType ot in TableObj).ToDictionary(x => x.Key);

或者

var dict = TableObj.ToDictionary(t => t.Key, t=> t.TimeStamp);