c# - wpf mvvm recursive tree -

i have 2 classes

public class leaf {     public string name { get; set; } } 

and

public class node {     public observablecollection<node> nodelist = new observablecollection<node>();     public observablecollection<leaf> leaflist = new observablecollection<leaf>();     public observablecollection<node> prop_nodelist { { return nodelist; } set { nodelist = value; } }     public observablecollection<leaf> prop_leaflist { { return leaflist; } set { leaflist = value; } }      public string name { get; set; } } 

as can see work roads or tree. node can have information on node , leaf.

i show in user control tree formated that

nethead main node, , have 2 node (b, a). node have 2 node(b,c) , 2 leaf (a1, a2). dont mvvm. when mvvm like

from c# im doing only

this.datacontext = mainnode; // node hold everething (its named nethead) 

from xaml its

<grid>     <treeview itemssource="{binding prop_nodelist}">         <treeview.resources>              <hierarchicaldatatemplate datatype="{x:type local:node}" itemssource="{binding prop_nodelist}">                 <textblock text="{binding path=name}"/>             </hierarchicaldatatemplate>              <hierarchicaldatatemplate datatype="{x:type local:leaf}" itemssource="{binding prop_leaflist}">                 <textblock text="{binding path=name}"/>             </hierarchicaldatatemplate>           </treeview.resources>     </treeview> </grid> 

you see want ? want make double treeitem in treeview, doesnt work :( please help, projekt ant algorithm , want best gui in class room

have bit modified code: implemented root view model nodesdata demonstrate , create startup data. added property children have single property children of node. , modified xaml use single hierarchical data template. , seems works.

  public class leaf {     public string name { get; set; } }  public class node  {     public string name { get; set; }     public observablecollection<node> nodelist = new observablecollection<node>();     public observablecollection<leaf> leaflist = new observablecollection<leaf>();     public observablecollection<node> prop_nodelist { { return nodelist; } set { nodelist = value; } }     public observablecollection<leaf> prop_leaflist { { return leaflist; } set { leaflist = value; } }      public observablecollection<object> children     {                 {             var children = prop_nodelist.oftype<object>();             return new observablecollection<object>(children.concat(prop_leaflist.oftype<object>()));         }     }  }  public class nodesdata  {     public observablecollection<node> rootsource { get; set; }      public nodesdata()     {         var rootnode = new node() { name = ">>>head node<<<<" };           var b = new node() { name = "b" };         var c = new node() { name = "c" };         var = new node()                     {                         name = "a",                         prop_nodelist = new observablecollection<node>() { b, c },                         prop_leaflist = new observablecollection<leaf>() { new leaf() { name = "a1" }, new leaf() { name = "a2" } }                     };         rootnode.prop_nodelist = new observablecollection<node>() { b, };          rootsource = new observablecollection<node>() { rootnode };     } } 

}

xaml:

    <grid>     <grid.resources>         <wpfapplication1:nodesdata x:key="datasource"/>     </grid.resources>     <treeview itemssource="{binding rootsource}" datacontext="{staticresource datasource}">         <treeview.resources>              <hierarchicaldatatemplate datatype="{x:type wpfapplication1:node}" itemssource="{binding children}">                 <textblock text="{binding path=name}"/>             </hierarchicaldatatemplate>             <datatemplate datatype="{x:type wpfapplication1:leaf}" >                 <textblock text="{binding path=name}"/>             </datatemplate>            </treeview.resources>     </treeview> </grid>