c# - Working with Trees in Rx.NET / ReactiveUI -


how observe property changes on sublevel of tree?

consider example class treenode properties name , childnodes. how observe name changes on sublevel of treenode?

the usage might this:

rootnode.flattentreetoobservable(x => x.childnodes)         .whenanyvalue(x => x.name)         .subscribe(...)

treenode example:

// nuget: install-package reactiveui // in case of splat version issue: install-package splat -version 1.6.2 using reactiveui;   public class treenode: reactiveobject  {     public string name     {         { return this._name; }         set { this.raiseandsetifchanged(ref this._name, value); }     }     private string _name = "";      public reactivelist<treenode> childnodes     {         { return this._childnodes; }         set { this.raiseandsetifchanged(ref this._childnodes, value); }     }     private reactivelist<treenode> _childnodes = new reactivelist<treenode>(); }

i couldn't code run - ended dll versioning issue wrote basic class uses same structure yours work:

public class treenode {     public string name { get; set; }      public subject<treenode> childnodes { get; }         = new subject<treenode>(); }

i added following method:

    public iobservable<treenode> flattentreetoobservable()     {         return             this.childnodes                 .selectmany(cn => cn.flattentreetoobservable())                 .startwith(this);     }

now when run test code:

var root = new treenode() { name = "r" };  root.flattentreetoobservable().subscribe(tn => console.writeline(tn.name));  var a1 = new treenode() { name = "a1" }; root.childnodes.onnext(a1);  var b11 = new treenode() { name = "b11" }; a1.childnodes.onnext(b11);  var b12 = new treenode() { name = "b12" }; a1.childnodes.onnext(b12);  var a2 = new treenode() { name = "a2" }; root.childnodes.onnext(a2);  var b21 = new treenode() { name = "b21" }; a2.childnodes.onnext(b21);  var b22 = new treenode() { name = "b22" }; a2.childnodes.onnext(b22);

i output:

 r a1 b11 b12 a2 b21 b22

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