Usinq Linq根据逗号分隔值获取行

Question

我的专栏中有逗号分隔的数据col1，我有一个字符串数组

IEnumerable<string> year = {"1990","1991","1992","1993","1994","1995","1996","1997","1998","1999","2000"}

我试过以下

searchfrom = searchfrom.Where(x => years.Contains(x.col1.Replace(',', ' '))).ToList();

和

searchfrom = searchfrom.Where(x => years.Contains(x.col1)).ToList();

我想要那个匹配任何＆＃34;年＆＃34;进入＆＃34; col1＆＃34;

Answer 1

要优化此类查询，您应首先将years集合转换为哈希集。

var years = new HashSet<string>(new [] { "1990", "1991", ... });

在Where子句中，您需要拆分可以使用x的每条记录x.Split(',')的内容。然后，您需要检查years集合中是否包含这些子部分。

var result = searchfrom.Where(x => 
    x.Split(',').Any(years.Contains)
).ToList();