Union tables with LINQ query for custom Model - entity-framework

Question

I have 3 tables(in origin its 6 but shorter better here)
they all have have a key column in common I want to filter and union all these tables using linq
Here what I did so far, actually it works but you will understand me why I post this since you saw the code below
var query = (from icr in ictetkikRadyoloji
where icr.CommanId == userId
select new MyCustomModel
{
ID = icr.ID,
IstemTarihi = icr.IstemTarihi,
Laboratuvar = icr.Laboratuvar,
Sonuc = icr.Sonuc,
HastaGuid = "-",
Type_ = "1"
}).Union(from icb in ictetkikBakteriyoloji
where icb.CommanId == userId select new MyCustomModel
{
ID = icb.ID,
IstemTarihi = icb.IstemTarihi,
Laboratuvar = icb.Laboratuvar,
Sonuc = "-",
HastaGuid ="someGuid",
Type_ = "2"
}).Union(from icbk in ictetkikBiyokimya
where icbk.CommanId == userId select new MyCustomModel
{
ID = icbk.ID,
IstemTarihi = DateTime.Now,
Laboratuvar = icbk.Laboratuvar,
Sonuc = "-",
HastaGuid ="SomeGuid",
Type_ = "3"
});
You see its so ugly and its uglier than this in origin :( how can I make this little bit more beauty, since they all return entities as specific Model(MyCustomModel)
I feel like it can be..

Answer 1

You could first perform projection and then union over all cases. The only additional data that projection should have is CommanId. You can use anonymous types, so you don't have to create another class just for intermediate projection. After that you can specify your filter just once and do final projection to MyCustomModel.
For example:
var unionQuery = (from icr in ictetkikRadyoloji
select new
{
ID = icr.ID,
IstemTarihi = icr.IstemTarihi,
Laboratuvar = icr.Laboratuvar,
Sonuc = icr.Sonuc,
HastaGuid = "-",
Type_ = "1",
CommanId = icr.CommanId
}).Union(
(from icb in ictetkikBakteriyoloji
select new
{
ID = icb.ID,
IstemTarihi = icb.IstemTarihi,
Laboratuvar = icb.Laboratuvar,
Sonuc = "-",
HastaGuid = "someGuid",
Type_ = "2",
CommanId = icb.CommanId
})).Union(
(from icbk in ictetkikBiyokimya
select new
{
ID = icbk.ID,
IstemTarihi = DateTime.Now,
Laboratuvar = icbk.Laboratuvar,
Sonuc = "-",
HastaGuid = "SomeGuid",
Type_ = "3",
CommanId = icbk.CommanId
}));
var query = from i in unionQuery
where i.CommanId = userId
select new MyCustomModel
{
ID = i.ID,
IstemTarihi = i.IstemTarihi,
Laboratuvar = i.Laboratuvar,
Sonuc = "-",
HastaGuid = "SomeGuid",
Type_ = "3",
};
Alternatively you could add property CommanId to MyCustomModel and then you don't need final projection and anonymous types.

Answer 2

You have two options:
1. Get List of Lists
var query = (from icr in ictetkikRadyoloji
where icr.CommanId == userId
select new List<MyCustomModel>()
{
new MyCustomModel()
{
ID = icr.ID,
IstemTarihi = icr.IstemTarihi,
Laboratuvar = icr.Laboratuvar,
Sonuc = icr.Sonuc,
HastaGuid = "-",
Type_ = "1"
},
new MyCustomModel
{
ID = icb.ID,
IstemTarihi = icb.IstemTarihi,
Laboratuvar = icb.Laboratuvar,
Sonuc = "-",
HastaGuid = "someGuid",
Type_ = "2"
},
new MyCustomModel
{
ID = icbk.ID,
IstemTarihi = DateTime.Now,
Laboratuvar = icbk.Laboratuvar,
Sonuc = "-",
HastaGuid = "SomeGuid",
Type_ = "3"
}
});
2. Use loop through Objects
Load objects to memory and make 3 different copies of each object.
var result = new List<MyCustomModel>();
var query = (from icr in ictetkikRadyoloji
where icr.CommanId == userId
select icr)
.ToList()
.ForEach(x =>
{
result.Add(new MyCustomModel()
{
ID = icr.ID,
IstemTarihi = icr.IstemTarihi,
Laboratuvar = icr.Laboratuvar,
Sonuc = icr.Sonuc,
HastaGuid = "-",
Type_ = "1"
});
result.Add(new MyCustomModel()
{
ID = icr.ID,
IstemTarihi = icr.IstemTarihi,
Laboratuvar = icr.Laboratuvar,
Sonuc = "-",
HastaGuid = "someGuid",
Type_ = "2"
});
result.Add(new MyCustomModel()
{
ID = icr.ID,
IstemTarihi = DateTime.Now,
Laboratuvar = icr.Laboratuvar,
Sonuc = "-",
HastaGuid = "SomeGuid",
Type_ = "3"
});
});