I have these two classes:
public class LeadPerformanceItem
{
public string name { get; set; }
public int visitors { get; set; }
public decimal visitorspercentoftotal
{
get
{
// ?
}
}
}
public class LeadPerformanceItemCollection
{
public List<LeadPerformanceItem> items {get;set;}
public int totalvisitors
{
get
{
return items.Sum(x => x.visitors);
}
}
}
Is there anyway my visitorspercentoftotal property could be automatically calculated as items are added and removed from the collection?
public class LeadPerformanceItem
{
public string name { get; set; }
public int Visitors { get; set; }
private int _totalVisitors = 0;
public void UpdateTotalVisitors(int total)
{
this._totalVisitors = total;
}
public decimal Visitorspercentoftotal => _totalVisitors != 0
? Convert.ToDecimal(Math.Round(((double) (Visitors * 100)) / _totalVisitors))
: 0;
}
public class LeadPerformanceItemCollection
{
public List<LeadPerformanceItem> Items { get; set; }
public void AddToItems(LeadPerformanceItem item)
{
Items.Add(item);
var total = Items.Sum(x => x.Visitors);
Items.AsParallel().ForAll(i => i.UpdateTotalVisitors(total));
}
public int totalvisitors
{
get { return Items.Sum(x => x.Visitors); }
}
}
[TestFixture]
public class Class1
{
[Test]
public void Test()
{
var leadPerformanceItemCollection = new LeadPerformanceItemCollection();
leadPerformanceItemCollection.Items=new List<LeadPerformanceItem>();
leadPerformanceItemCollection.AddToItems(new LeadPerformanceItem()
{
name = "test",
Visitors = 10
});
leadPerformanceItemCollection.AddToItems(new LeadPerformanceItem()
{
name = "test2",
Visitors = 25
});
Console.WriteLine(leadPerformanceItemCollection.Items[0].Visitorspercentoftotal);
Console.WriteLine(leadPerformanceItemCollection.Items[1].Visitorspercentoftotal);
}
}
result:
29%
71%
One way would be to inherit from List and hide the Add method and create your own and do the calculation there.
public class LeadPerformanceItemCollection : List<LeadPerformanceItem>
{
public new void Add(LeadPerformanceItem item)
{
//calculate percent of total here
base.Add(item);
}
}
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