C# Arrays in Classes [duplicate]

Question

With these classes. How would I add a new widget with a few components? The Component cannot be a List< Component> as the real world models are from a web service that has that structure. I've done this using a List but when I try and add the 'Widget' class to the models further up the chain it doesn't work as expected

public class Widget { public int Id {get; set; } public string Name { get; set; } public Part[] parts { get; set; } } public class Part { public int Id { get; set; } public string Name { get; set; } } Widget widget = new Widget { Id = 1, Name = TheWidget }; foreach(var c in SomeArray) { Part part = new Part() { component.Id = c.Id, component.Name = c.Name } // Add component to widget }

"complains about"? Error details are usually very helpful to diagnose a problem. — Crowcoder
– Crowcoder, Commented May 20, 2022 at 11:41

Dmitrii Bychenko · Accepted Answer · 2022-05-20 11:50:14Z

If you want to stick to existing Widget implementation, you can create a List<Part> and then convert it into the array:

using System.Linq; ... List<Part> list = new List<Part>(); foreach(var c in SomeArray) { Part part = new Part() { Id = c.Id, Name = c.Name } // Add component to a list, not widget (we can't easily add to array) list.Add(part); } // Having all parts collected we turn them into an array and assign to the widget widget.parts = list.ToArray();

Linq will be a shorter:

widget.parts = SomeArray .Select(c => new Part() { Id = c.Id, Name = c.Name }) .ToArray();

A better approach is to change Widget: let's collect parts into a list, not array

public class Widget { public int Id {get; set; } public string Name { get; set; } public List<Part> Parts { get; } = new List<Part>(); }

then you can put

foreach(var c in SomeArray) { Part part = new Part() { Id = c.Id, Name = c.Name } // Add component to widget widget.Parts.Add(part); }

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