在使用EF时，想要比较字符串类型的日期时，参考以下：
SQL语句：
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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：
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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：
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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) |
原文：http://www.cnblogs.com/nele/p/5075645.html