我如何使用LINQ中where语句中的多个字符串进行查询

Question

我想知道如何以及如果我可以轻松地查询多个字符串/整数这样的事情？

var test = from a in db.PlasserLans
from b in db.Ulans
where a.registeredNick == b.Username &&
a.Nick == {"Ayuris" , "Crey" , "DjMofasa" , "esel" , "Firaxa" , 
           "Kindleguy" , "Michigo" , "moiC" ,"Shibiz"}
orderby a.Nick
select new
{
    Nick = a.Nick,
    Username = b.Username,
    Email = b.UserEMail,
    RealName = b.UserRealname,
};

Answer 1

您可以在查询之前创建列表，这样可以更容易理解。你也可以在两个表上进行连接而不是循环。

List<string> nickList=new List<string> {"Ayuris" , "Crey" , "DjMofasa" , "esel" , "Firaxa" , "Kindleguy" , "Michigo" , "moiC" ,"Shibiz"};

var test = from a in db.PlasserLans
           join b in db.Ulans
           on a.registeredNick equals b.Username
           where nickList.Contains(a.Nick)
           orderby a.Nick
           select new
                  {
                      Nick = a.Nick,
                      Username = b.Username,
                      Email = b.UserEMail,
                      RealName = b.UserRealname,
                  };

Answer 2

在Linq-2-sql中它只是相反的方式

 where .... &&
 {"Ayuris" , "Crey" , "DjMofasa"}.Contains(a.Nick)

这很明确，不确定{}的直接用法是否有效，但你需要检查linq-2-sql的.Contains（），它会起作用。