C1MultiSelect CombBox dropdown list not updating when ItemsSource changed

C1MultiSelect CombBox dropdown list not updating when ItemsSource changed

Posted by: msloan on 5 July 2018, 12:43 am EST

• 

  msloan

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  Posted 5 July 2018, 12:43 am EST

  Hi,

  I’m using a C1MultiSelect is display list of objects of type:

  
      /// <summary>
      /// Class to hold all the ComboBox items and ID
      /// </summary>
      public class ComboEntity
      {
          public int ID { get; set; }
          public string Title { get; set; }
      }
  
  

  When I bind a list of ComboEntity, I’m using:

  
  
  	    List<ComboEntity> M_lstUserListEntries = new List<ComboEntity>();
  
  	    // Fill M_lstUserListEntries with some entries
  
              M_cmbUserList.ItemsSource = M_lstUserListEntries;
              M_cmbUserList.DisplayMemberPath = "Title";
              M_cmbUserList.SelectedValuePath = "Title";
  
  	    // Here Dropdown List is correct
  
  	    // Fill M_lstUserListEntries with different entries
  
              M_cmbUserList.ItemsSource = M_lstUserListEntries;
              M_cmbUserList.DisplayMemberPath = "Title";
              M_cmbUserList.SelectedValuePath = "Title";
  
  	    // Here Dropdown List is NOT correct
  
  
  

  However when I change the contents of M_lstUserListEntries and update the C1MultiSelect control’s Item Source, I am finding the drop-down list contains the values from the PREVIOUS list. If I then select an entry from this dropdown, the text in the Combo is change to the corresponding string from the NEW list.

  Is there something I need to do to update the Dropdown list if the ItemsSource changes?

  Regards,
  
  Mark Sloan

• 

  Ruchir.Agarwal

  

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  Posted 5 July 2018, 10:27 pm EST

  Hi Mark,
  
  I do not observe the same behavior at my end. See attached screen-shots.

  public MainWindow()
          {
              InitializeComponent();
              {
                  List<ComboEntity> M_lstUserListEntries = new List<ComboEntity>();
  
                  // Filling M_lstUserListEntries with some entries
                  for (int i = 1; i < 11; i++)
                      M_lstUserListEntries.Add(new ComboEntity() { ID = i, Title = "Title" + i.ToString() });
  
                  M_cmbUserList.ItemsSource = M_lstUserListEntries;
                  M_cmbUserList.DisplayMemberPath = "Title";
                  M_cmbUserList.SelectedValuePath = "Title";
  
                  // Filling M_lstUserListEntries with different entries, so clearing the collection first
                  M_lstUserListEntries.Clear();
                  for (int i = 1; i < 11; i++)
                      M_lstUserListEntries.Add(new ComboEntity() { ID = i, Title = "NewTitle" + i.ToString() 	 
  });
                  //No need of following statements
                  //M_cmbUserList.ItemsSource = M_lstUserListEntries;
                  //M_cmbUserList.DisplayMemberPath = "Title";
                  //M_cmbUserList.SelectedValuePath = "Title";
              }
          }
  ``` Please let me if I am missing anything here.
  ~Ruchir
  [zip filename="C1MultiSelect_DrpDwn.zip"]https://gccontent.blob.core.windows.net/forum-uploads/file-bd5528de-caea-4607-bf12-20b669a82d68.zip[/zip][img]https://gccontent.blob.core.windows.net/forum-uploads/file-0a7f982c-102b-4806-9e01-ede4717c92a3.png[/img]