System.String []斯普利特（的char []）'方法无法识别 [英] System.String[] Split(Char[])' method unrecognized

问题描述

我有以下的数据，我想筛选使用LINQ to实体的数据，但我得到异常：

I have the following data and i want to filter the data using Linq to Entities, But i am getting the exception :

LINQ到实体无​​法识别方法'System.String []
  分裂（字符[]）'方法，和这种方法不能被翻译成
  店前pression。

LINQ to Entities does not recognize the method 'System.String[] Split(Char[])' method, and this method cannot be translated into a store expression.

我在表格下面的数据

1           HPM,BKM     NULL        1,2,3
2           HPM,BKM     L1,L2       1,2
3           KK,CC,ZZ,PP             3,4

和我写了下面的code

And i am writing the following code

var criteria_1="1";

var criteria_2="HPM,"

var Col4 = DB.Letter_Logic.Where(m => m.Col1.Equals(criteria_1)
            && m.Col2.Split(',').Contains(criteria_2)).ToList();

应该给我值1,2,3作为我的结果。

It should be give me values 1,2,3 as my result.

推荐答案

这是因为没有办法斯普利特（字符[]）转换成SQL前pression。您需要做了ToList（）首先然后执行你的分割操作，但要注意，这将带回更多结果到您的计算机使用分体式前pression筛选出来之前：

This is because there is no way to translate Split(Char[]) into a SQL expression. You would need to do a ToList() first then perform your split operation, but beware that this will bring back more results to your computer before filtering them out using your split expression:

var Col4 = DB.Letter_Logic.Where(m => m.Col1.Equals(criteria_1))
                          .ToList()
                          .Where(m => m.Col2.Split(',').Contains(criteria_2))
                          .ToList();

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