如何在linq中调用UDF到sql查询？

CREATE FUNCTION GetFullName
(
    @FirstName NVARCHAR(50),
    @LastName NVARCHAR(50)
)
RETURNS NVARCHAR(100)
AS
BEGIN
    RETURN @FirstName + ' ' + @LastName
END

using (var context = new MyDbContext())
{
    var query = from user in context.Users
                select new
                {
                    FullName = SqlFunctions.UserDefinedFunction(user.FirstName, user.LastName)
                };

    var results = query.ToList();
}

using (var context = new MyDbContext())
{
    var query = from user in context.Users
                select new
                {
                    FullName = context.Database.SqlQuery<string>("SELECT dbo.GetFullName(@p0, @p1)", user.FirstName, user.LastName).FirstOrDefault()
                };

    var results = query.ToList();
}