Cannot looping through wpf treeview parent and its child node ...i get parent node value but its child return null value.

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Cannot looping through wpf treeview parent and its child node ...I get Parent node value but its child return null value.

Below is my WPF treeview and #code how it is binding . I am using DataContext to bind data , which is working fine .

I want to hide / show the ImgLogin image to dynamically from code behind.

HTML

<treeview margin="368,61,0,0" itemssource="{Binding}" x:name="tvGroupUsers" horizontalalignment="Left" verticalalignment="Top" width="245" height="375" rendertransformorigin="-4.929,1.701" grid.column="1" xmlns:x="#unknown">
          <treeview.resources>
              <datatemplate x:key="childrenDataTemplate">
                  <stackpanel orientation="Horizontal">
                      <border name="CornersMask" removed="SkyBlue" cornerradius="50" height="30" width="30" horizontalalignment="Left" margin="-25,5,5,5" verticalalignment="Top" />
                      <Image  Name="image1" Source="{Binding DisplayedImage}" Stretch="Fill" UseLayoutRounding="True" Height="30" Width="30"   HorizontalAlignment="Left" Margin="-34,4,0,0"  VerticalAlignment="Top">
                          <Image.OpacityMask>
                              <visualbrush visual="{Binding ElementName=CornersMask}" />
                          </Image.OpacityMask>
                          <Image.Effect>
                              <dropshadoweffect />
                          </Image.Effect>
                      </Image>
                      <Label Content="{Binding Path=Name}"></Label>
                      <Image  Name="ImgAlert" Visibility="Visible" Height="16" Width="16" Tag="{Binding Path=UserID}" Source="{Binding ImgAlertMsg}"></Image>
                      <Image  Name="ImgLogin"  Visibility="Visible"  Height="15" Width="16" Tag="{Binding Path=UserID}" Source="{Binding ImgLogin}"></Image>
                      <Label Content="{Binding Path=UserID}" Visibility="Hidden"/>
                  </stackpanel>
              </datatemplate>
          </treeview.resources>
          <treeview.itemtemplate>
              <hierarchicaldatatemplate itemssource="{Binding Path=ClientsList}" itemtemplate="{StaticResource ResourceKey=childrenDataTemplate}">
                  <textblock text="{Binding Path=ChatGroup}" fontweight="Bold" />
              </hierarchicaldatatemplate>
          </treeview.itemtemplate>
      </treeview>

Below is my Code behind code ..

C#

lstGroups = proxy.GetExistingGroups();
                    if (lstGroups.Count > 0)
                        {
                            for (int i = 0; i < lstGroups.Count; i++)
                            {
                                SVC.Groups objGroups = new SVC.Groups();
                                objGroups.GroupID = lstGroups[i].GroupID;
                                objGroups.ChatGroup = objUtilities.ConvertToCamelCase(lstGroups[i].ChatGroup);

                                if (objGroups.GroupID == 0)
                                {
                                    lstClient = proxy.GetUsers(this.localClient.UserID.ToString());
                                    finallstClient = new List<SVC.Client>();
                                    for (int k = 0; k < lstClient.Count; k++)
                                    {
                                        objUtilities = new Utilities();
                                        SVC.Client objClient = new SVC.Client();
                                        objClient.DisplayedImage = "";
                                        objClient.FirstName = lstClient[k].FirstName;
                                        objClient.LastName = lstClient[k].LastName;
                                        objClient.UserID = lstClient[k].UserID;
                                        objClient.PersonalMail = lstClient[k].PersonalMail;
                                        objClient.Name = lstClient[k].FirstName + " " + lstClient[k].LastName;
                                        objClient.Picture = lstClient[k].Picture;
                                        objClient.ImgAlertMsg = ImgAlertMsg;
                                        objClient.ImgLogin = ImgLogin;

                                        if (lstClient[k].Picture != null)
                                        {
                                            objClient.DisplayedImage = CreateUserImages(objClient);
                                        }
                                        else
                                        {
                                            objClient.DisplayedImage = defaultPath;
                                        }
                                        finallstClient.Add(objClient);
                                        AllClients.Add(lstClient[k].UserID.ToString(), objClient);
                                    }
                                    objGroups.ClientsList = finallstClient;
                                }
                                else
                                {
                                    lstClient = proxy.GetGroupUsers(objGroups.GroupID.ToString(), this.localClient.UserID.ToString());
                                    if (lstClient.Count > 0)
                                    {
                                        finallstClient = new List<SVC.Client>();
                                        for (int j = 0; j < lstClient.Count; j++)
                                        {
                                            objUtilities = new Utilities();
                                            SVC.Client objClient = new SVC.Client();
                                            objClient.DisplayedImage = "";
                                            objClient.FirstName = lstClient[j].FirstName;
                                            objClient.LastName = lstClient[j].LastName;
                                            objClient.UserID = lstClient[j].UserID;
                                            objClient.PersonalMail = lstClient[j].PersonalMail;
                                            objClient.Name = lstClient[j].FirstName + " " + lstClient[j].LastName;
                                            objClient.Picture = lstClient[j].Picture;
                                            objClient.ImgAlertMsg = ImgAlertMsg;
                                            objClient.ImgLogin = ImgLogin;

                                            if (lstClient[j].Picture != null)
                                            {
                                                objClient.DisplayedImage = CreateUserImages(objClient);
                                            }
                                            else
                                            {
                                                objClient.DisplayedImage = defaultPath;
                                            }
                                            finallstClient.Add(objClient);
                                        }
                                        objGroups.ClientsList = finallstClient;
                                    }
                                }
                                finallstGroups.Add(objGroups);
                            }

                            tvGroupUsers.DataContext = finallstGroups;

Its urgent Please reply asap...
Thanks in Advance..

What I have tried:

C#

foreach (object parent in items.Items)
            {
                TreeViewItem treeItem = this.tvGroupUsers.ItemContainerGenerator.ContainerFromItem(parent) as TreeViewItem;
                ItemsControl childControl = ItemsControl.ItemsControlFromItemContainer(treeItem);

                foreach (object child in treeItem.Items)
                {
                    TreeViewItem childtreeview = this.tvGroupUsers.ItemContainerGenerator.ContainerFromItem(child) as TreeViewItem;
                }               
            }

childtreeview return null

Posted 21-Feb-16 19:39pm

Ram_Awadh

Updated 22-Mar-16 21:38pm

Maciej Los

v2

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TABiSH777 · Answer 1 · 2016-03-22T21:38:00

Use this Helper method in code behind

C#

T GetVisualChild<t>(DependencyObject parent, string name) where T : Visual
        {
            T child = default(T);
            int numVisuals = VisualTreeHelper.GetChildrenCount(parent);
            for (int i = 0; i < numVisuals; i++)
            {
                Visual v = (Visual)VisualTreeHelper.GetChild(parent, i);
                child = v as T;
                if (child == null)
                {
                    child = GetVisualChild<t>(v, name);
                }
                if (child != null)
                {
                    break;
                }
            }
            return child;
        }

</t></t>

You just Need is
for eg. Declare Your Image First in your code behind as

C#

Image ImgAlert=new Image();

in your constructor or Loaded method

then on your event You can call this method by

C#

ImgAlert=GetVisualChild<treeview>(this, "ImgAlert");
</treeview>