Linq to SQL:WHERE IN语句

Question

CREATE TABLE [MyNames]
(
    [ID] INT IDENTITY PRIMARY KEY,
    [Name] NVARCHAR(255) NULL
)

INSERT INTO [MyNames] VALUES ('John')
INSERT INTO [MyNames] VALUES ('Jane')
INSERT INTO [MyNames] VALUES ('Peter')
INSERT INTO [MyNames] VALUES ('Montgomery')
INSERT INTO [MyNames] VALUES ('Sarah')

基于上面(假设的)SQL模式和数据,我想使用Linq to SQL来获取名称在数组值中的所有结果.

string[] names = {"John", "Cassandra", "Sarah"};

var results = (from n in db.Names
               where n.Name **in names**
               select n).ToList();

结果应包括John和Sarah.根据该信息,我可以添加需要添加的条目,在本例中Cassandra.

我不想加载所有名称,因为列表可能会异常长.

Answer 1

你可以使用names.Contains():

string[] names = {"John", "Cassandra", "Sarah"};

var results = (from n in db.Names
               where names.Contains(n.Name)
               select n).ToList();

Answer 2

您可以使用Contains扩展方法：

var results = (from n in db.Names
               where names.Contains(n.Name)
               select n).ToList();