LINQ to Entities无法识别方法'System.String ToBase64String(Byte [])'方法,并且此方法无法转换为商店表达式。
var activityList = (from item in committeeMemberList
let committee = db.Committee.FirstOrDefault(x => x.Committee_Id == item.Committee_Id)
let contact = db.Contacts.FirstOrDefault(x => x.Contact_Id == item.Contact_Id)
select new Activity
{
Id = Convert.ToBase64String(item.Committee_Member_SPE_Id),
Name = committee.Committee_Name,
...
...
}).ToList();
答案 0 :(得分:3)
更改LINQ,以便原始语句返回匿名对象列表,然后在THAT列表中选择并使用ToBase64String函数:
var activityList =
(from item in
(from member in committeeMemberList
let committee = db.Committee.FirstOrDefault(x => x.Committee_Id == item.Committee_Id)
let contact = db.Contacts.FirstOrDefault(x => x.Contact_Id == item.Contact_Id)
select new
{
Id = member.Committee_Member_SPE_Id,
Name = committee.Committee_Name,
...
...
}).ToList())
select new Activity
{
Id = Convert.ToBase64String(item.Id),
Name = committee.Committee_Name,
...
...
}).ToList();
答案 1 :(得分:0)
var activityList =
(from item in
(from member in committeeMemberList
let committee = db.Committee.FirstOrDefault(x => x.Committee_Id == item.Committee_Id)
let contact = db.Contacts.FirstOrDefault(x => x.Contact_Id == item.Contact_Id)
select new
{
Id = member.Committee_Member_SPE_Id,
Name = committee.Committee_Name,
...
...
}).ToList());
//After Collecting information just update current value to base4string using following Syntax
activityList.ForEach(s=>s.id=(s.id==null?"noimage":Convert.ToBase4String(s.id));