一、在使用Linq时，想要比较字符串类型的日期时，参考以下：
SQL语句：
1）select * from TableName where StartTime > ‘2015-04-08‘ 2）select * from TableName where StartTime >= ‘2015-04-08‘ 3）select * from TableName where StartTime < ‘2015-04-08‘ 4）select * from TableName where StartTime <= ‘2015-04-08‘
lambda表达式写法：
1）.Where(a => a.StartTime.CompareTo(‘2015-04-08‘) > 0) 2）.Where(a => a.StartTime.CompareTo(‘2015-04-08‘) >= 0) 3）.Where(a => a.StartTime.CompareTo(‘2015-04-08‘) < 0) 4）.Where(a => a.StartTime.CompareTo(‘2015-04-08‘) <= 0)
更规范的写法：
1）.Where(a => String.Compare(a.StartTime, ‘2015-04-08‘, StringComparison.Ordinal) > 0) 2）.Where(a => String.Compare(a.StartTime, ‘2015-04-08‘, StringComparison.Ordinal) >= 0) 3）.Where(a => String.Compare(a.StartTime, ‘2015-04-08‘, StringComparison.Ordinal) < 0) 4）.Where(a => String.Compare(a.StartTime, ‘2015-04-08‘, StringComparison.Ordinal) <= 0)
二、但是，又遇到Linq延时查询的问题。
转载：http://www.itdos.com/CSharp/20150408/0127321.html
原文：http://www.cnblogs.com/sdadx/p/7095828.html