Binding collection of custom classes to TreeView

问题

I'm trying to determine the best way to accomplish binding a Collection of a custom class to a TreeView.

I currently have two custom classes, one held in a Collection, and one held in a Collection inside the first class:

Collection<Device> _devices = new Collection<Device>();

class Device
{
    public ulong DeviceID { get; private set; }

    private List<Capability> _capabilities = new List<Capability>();

    public string FriendlyName{ get; set; }

    public Capability AddCapability(Capability capability)
    {
        _capabilities.Add(capability);
        return capability;
    }

   public List<Capability> GetCapabilities()
   {
       // not safe yet
       return _capabilities;
   }
}

abstract class Capability
{
    public uint CapabilityIndex { get; private set; }
    public string FriendlyName{ get; set; }
}

I'm trying to get a TreeView to display the collection of devices which when expanded lists the capabilities.

Options I've considered include:

looping through and creating TreeNode objects from the data I want to display (but I'm not sure how is best to refer back to the original object when selected)
inheriting from the TreeNode class but this feels ugly as I'm storing the same data in multiple places (and most of the time I don't need them as TreeNodes so it feels like a waste of resources)

Any suggestions?

回答1:

When dealing with a TreeView, I usually end up generating a wrapper class that inherits from TreeNode and which holds the actual object that I'm displaying as the node. That way I can bind to the TreeView, get the heirarchy I need, and my business classes don't actually have to subclass a UI component. It works nicely when handling the TreeView events as well, because you can just inspect the node for its type and different typed nodes can be handled differently - display a different UI or whatever.

private class FooNode : TreeNode
{
    public FooNode(Foo foo)
    {
        this.Text = foo.ToString(); //Or FriendlyName
        this.Foo = foo;
        this.Foo.Bars.ForEach(x => this.Nodes.Add(new BarNode(x)));
    }

    public Foo Foo
    {
        get;
        private set;
    }
}

private class BarNode : TreeNode
{
    public BarNode(Bar bar)
    {
        this.Text = bar.ToString(); //Or FriendlyName
        this.Bar = bar;
    }

    public Bar Bar
    {
        get;
        private set;
    }
}

This example may be exactly what you mean by your second option. In that case, I vote for the second option!

来源：https://stackoverflow.com/questions/11416398/binding-collection-of-custom-classes-to-treeview

标签

winforms

collections

treeview