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Grouping data in ViewModel ASP.NET MVC & C#


Grouping data in ViewModel ASP.NET MVC & C#

By : Andres Fakelok
Date : October 21 2020, 08:10 PM
Hope that helps You can get the quantities, assuming that you have 1 record for each instance of a product using a groupBy query.
Something to note is that this is not the most ideal data structure as you will have repeated records for all of your quantities. It will become very inefficient to store thousands of duplicate records to keep track of quantity.
code :
var products = productCollection //This is however you are accessing your product db set 
                   .GroupBy(c => new { c.EAN, c.ProductName})
                   .Select(c => new ProductViewModel { 
                       EAN = c.Key.EAN, 
                       ProductName = c.Key.ProductName, 
                       Quantity = c.Count()
                    });


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grouping in itemscontrol using ItemsSource from ViewModel

grouping in itemscontrol using ItemsSource from ViewModel


By : Greo
Date : March 29 2020, 07:55 AM
this will help I've used ListCollectionView in C# instead of CollectionViewSource in XAML.
LINQ grouping and ordering of top 5 rows into ViewModel List

LINQ grouping and ordering of top 5 rows into ViewModel List


By : Strawhat Chan
Date : March 29 2020, 07:55 AM
this will help What is the reason for the 'GroupBy'? It seems to me that all you need to do is select the top 5 rows from db.Stats ordering by Hits descending. Like this:
code :
var results = (
    from s in db.Stats
    join p in db.Players on s.PlayerID equals p.ID
    where s.SeasonID == lastSeasonId
    order by s.Hits descending
    select new { Player = p, Stats = s })
    .Take(5).ToList();
var hitLeaders = (from s in stats
                  join p in players on s.PlayerID equals p.ID
                  group s by new { s.PlayerID, s.SeasonID } into g
                  select new 
                  { 
                     PlayerID = g.Key.PlayerID, 
                     SeasonID = g.Key.SeasonID, 
                     Hits = g.Sum(sum => sum.Hits),
                     AtBats = g.Sum(sum => sum.AtBats),
                     Walks = g.Sum(sum => sum.Walks),
                     Singles = g.Sum(sum => sum.Singles),
                     Doubles = g.Sum(sum => sum.Doubles),
                     Triples = g.Sum(sum => sum.Triples),
                     HomeRuns = g.Sum(sum => sum.HomeRuns),
                     RBIs = g.Sum(sum => sum.RBIs),
                     Runs = g.Sum(sum => sum.Runs),
                     ReachedOnErrors = g.Sum(sum => sum.ReachedOnErrors),
                     SacrificeFlies = g.Sum(sum => sum.SacrificeFlies)
                  }).OrderByDescending(s => s.Hits).Take(5);
public class TotalStat
{
    public int TotalStatID { get; set; }
    public int SeasonID { get; set; }
    public int PlayerID { get; set; }
    public int AtBats { get; set; }
    public int Hits { get; set; }
    public int Walks { get; set; }
    public int Singles { get; set; }
    public int Doubles { get; set; }
    public int Triples { get; set; }
    public int HomeRuns { get; set; }
    public int RBIs { get; set; }
    public int Runs { get; set; }
    public int ReachedOnErrors { get; set; }
    public int SacrificeFlies { get; set; }
}
public List<TotalStat> SeasonLeadersHits { get; set; }
//...
group s by new { s.PlayerID, s.SeasonID } into g
select new TotalStat
{ 
    PlayerID = g.Key.PlayerID, 
//...
How ViewModel in MVVM (data binding) is differ from ViewModel in Android Architectural components

How ViewModel in MVVM (data binding) is differ from ViewModel in Android Architectural components


By : Prasanna Balaji
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Firstly, you need to realize MVVM is the name of an architecture. It's used to extract the logic from the View and put it into the ViewModel. One of the great benefits of doing this is making this logic more easily testable.
The ViewModel class from the Architecture Components has the same name but is in itself not the same. It's just a handy tool to keep data from being deleted when the state of your View changes (e.g.: when the screen is rotated).
How to pass data from ContentPage ViewModel to ContentView Viewmodel in Xamarin Forms with mvvmLight?

How to pass data from ContentPage ViewModel to ContentView Viewmodel in Xamarin Forms with mvvmLight?


By : Jonathon
Date : March 29 2020, 07:55 AM
should help you out For anyone stumbling over a similar issue, this is how I solved it. I'm not completely happy about the solution, but it works:
I have the control ViewModel as a Property in my page ViewModel and set it programmatically:
code :
<controls:PageNavigationControl Grid.Row="1" BindingContext="{Binding NavigationViewModel}"/>
Returning data from Room to ViewModel and later update the ViewModel with new data from webservice

Returning data from Room to ViewModel and later update the ViewModel with new data from webservice


By : Nefarious
Date : March 29 2020, 07:55 AM
this will help You can make your DAO return LiveData. It means that you can get notified about every change on that entity.
Assume that you have a User entity:
code :
@Entity
data class User(
    @PrimaryKey(autoGenerate = true) var uid: Int = 0,

    @ColumnInfo(name = "name")
    val name: String
)
@Dao
interface UserDao {

    @Query("SELECT * FROM user")
    fun all(): LiveData<List<User>>

    @Insert
    suspend fun insert(vararg users: User)
}
class UserViewModel : ViewModel() {

    val users: LiveData<List<User>> = userDao.all()
}

class UserActivity : AppCompatActivity() {
    private val viewModel by viewModels<UserViewModel>()

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        viewModel.users.observe(this, Observer { users ->
            // show data
        })
    }
}
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