xaml - WPF TreeView HierarchicalDataTemplate - binding to object with multiple child collections -


i trying treeview bind collection groups show nested groups , each group show entry.

how can use hierarchicaldatatemplate treeview process both subgroups , entries collection?

groups show subgroups , entries:

example: group1 --entry --entry group2 --group4 ----group1 ------entry ------entry ----entry ----entry --entry --entry group3 --entry --entry


objects:

namespace taskmanager.domain {     public class entry     {         public int key { get; set; }         public string name { get; set; }     } }  namespace taskmanager.domain {     public class group     {         public int key { get; set; }         public string name { get; set; }          public ilist<group> subgroups { get; set; }         public ilist<entry> entries { get; set; }     } }

test data:

namespace drilldownview {     public class testdata     {          public ilist<group> groups = new list<group>();          public void load()         {             group grp1 = new group() { key = 1, name = "group 1", subgroups = new list<group>(), entries = new list<entry>() };             group grp2 = new group() { key = 2, name = "group 2", subgroups = new list<group>(), entries = new list<entry>() };             group grp3 = new group() { key = 3, name = "group 3", subgroups = new list<group>(), entries = new list<entry>() };             group grp4 = new group() { key = 4, name = "group 4", subgroups = new list<group>(), entries = new list<entry>() };              //grp1             grp1.entries.add(new entry() { key=1, name="entry number 1" });             grp1.entries.add(new entry() { key=2, name="entry number 2" });             grp1.entries.add(new entry() { key=3,name="entry number 3" });              //grp2             grp2.entries.add(new entry(){ key=4, name = "entry number 4"});             grp2.entries.add(new entry(){ key=5, name = "entry number 5"});             grp2.entries.add(new entry(){ key=6, name = "entry number 6"});              //grp3             grp3.entries.add(new entry(){ key=7, name = "entry number 7"});             grp3.entries.add(new entry(){ key=8, name = "entry number 8"});             grp3.entries.add(new entry(){ key=9, name = "entry number 9"});              //grp4             grp4.entries.add(new entry(){ key=10, name = "entry number 10"});             grp4.entries.add(new entry(){ key=11, name = "entry number 11"});             grp4.entries.add(new entry(){ key=12, name = "entry number 12"});              grp4.subgroups.add(grp1);             grp2.subgroups.add(grp4);              groups.add(grp1);             groups.add(grp2);             groups.add(grp3);         }     } }

xaml:

<window x:class="drilldownview.window2"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:local="clr-namespace:taskmanager.domain;assembly=taskmanager.domain"         title="window2" height="300" width="300">     <grid>         <grid.rowdefinitions>             <rowdefinition height="auto" />         </grid.rowdefinitions>         <grid.columndefinitions>             <columndefinition width="auto" />         </grid.columndefinitions>          <treeview name="groupview" grid.row="0" grid.column="0" itemssource="{binding}">             <treeview.resources>                 <hierarchicaldatatemplate datatype="{x:type local:group}" itemssource="{binding subgroups}">                     <textblock text="{binding path=name}" />                 </hierarchicaldatatemplate>                 <hierarchicaldatatemplate datatype="{x:type local:entry}" itemssource="{binding entries}">                     <textblock text="{binding path=name}" />                 </hierarchicaldatatemplate>             </treeview.resources>         </treeview>     </grid> </window>

xaml.cs:

public partial class window2 : window {     public window2()     {         initializecomponent();         loadview();     }      private void loadview()     {         testdata data = new testdata();         data.load();         groupview.itemssource = data.groups;     } }

a hierarchicaldatatemplate way of saying 'this how render type of object , here property can probed find child nodes under object'

therefore need single property returns 'children' of node. e.g. (if can't make both group , entry derive common node type)

public class group{ ....         public ilist<object> items         {                         {                 ilist<object> childnodes = new list<object>();                 foreach (var group in this.subgroups)                     childnodes.add(group);                 foreach (var entry in this.entries)                     childnodes.add(entry);                  return childnodes;             }         }

next don't need hierdatatemplate entry since entry doesn't have children. xaml needs changed use new items property , datatemplate entry:

<treeview name="groupview" grid.row="0" grid.column="0" itemssource="{binding}">     <treeview.resources>         <hierarchicaldatatemplate datatype="{x:type local:group}" itemssource="{binding items}">             <textblock text="{binding path=name}" />         </hierarchicaldatatemplate>         <datatemplate datatype="{x:type local:entry}" >             <textblock text="{binding path=name}" />         </datatemplate>     </treeview.resources> </treeview>

and here's looks like. screenshot of output


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