Question

例如，我正在搜索特定的人员ID，我想将该ID存储到本地变量或实例变量中。如何检索查询结果并将它们存储在带LINQ to SQL的int变量中？假设我们有这个查询

from user in dbo.DoctorsName
where doctorsName  = "Foo Bar"
select DOC_ID;

Answer 1

您可以像这样使用FirstOrDefault()：

var results = from user in dbo.DoctorsName
              where user.doctorsName  == "Foo Bar"
              select user;

string personName = results.FirstOrDefault().Name;

Answer 2

这应该有所帮助。

var name = dbo.DoctorsName.Where(item => item.doctorsName = "Foo Bar").Select(item => item.Name).FirstOrDefault();

如果您的病情没有记录，那么使用FirstOrDefault（）可能会抛出异常。为此，您可以尝试使用 -

var namelist = dbo.DoctorsName.Where(item => item.doctorsName = "Foo Bar").Select(item => item.Name);

If(namelist.Count() > 0)
   var name = namelist.Fisrt();

Answer 3

与此类似：

var ticketDepartment = from t in dt_tickets.AsEnumerable()
                       where t.Field<string>("MID") == mid
                       select new { department = t.Field<string>("Department") };

现在你在ticketDepartment.department中有你的变量

LINQ to SQL将查询结果存储在变量中

3 个答案: