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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2
3
4
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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'
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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)
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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)
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