C＃ - 如何使用lambda在Entity Framework中进行简单查询？

Question

I have an Entity Framework model semi-working right now, but I'm having trouble performing a query to return database records with a Where() clause.

I am trying to line:

db.BlackstoneUsers.Where(u => u.Email == User.Email); 

but I get the exception:

Expression cannot contain lambda expressions

I think this should be simple, but I'm just learning Entity and LINQ/Lambda.

Does anyone have any pointers?

Answer 1

try setting the email outside the call

var email = User.Email
db.BlackstoneUsers.Where(u => u.Email == email); 

Answer 2

Your code looks fine but what are you doing with the object?

Just this code will not work.

db.BlackstoneUsers.Where(u => u.Email == email); 

But what if you do like

var something = db.BlackstoneUsers.Where(u => u.Email == User.email);