How to remove item listbox & dictionary on click?

Question

I created a listbox with dictionary.

But I want to remove item listbox & dictionary at once on click.

Code:

Xaml:

<ListBox x:Name="ListBoxPlayList" SelectionMode="Extended"/>

<Button x:Name="addbtn" Margin="2,5,41,5" Click="addbtn_Click" />

<Button x:Name="removebtn" Click="removebtn_Click" />

Xaml.cs:

public  Dictionary<string, string> fileDictionary = new Dictionary<string, string>();

private void addbtn_Click(object sender, RoutedEventArgs e)
        {
            var listCount = ListBoxPlayList.Items.Count;
            Microsoft.Win32.OpenFileDialog ofd = new Microsoft.Win32.OpenFileDialog();
            ofd.DefaultExt = ".mp3";
            ofd.Filter = "All|*.*";
            ofd.Multiselect = true;
            Nullable<bool> result = ofd.ShowDialog();
            if (result == true)
            {
                for (int i = 0; i < ofd.FileNames.Length; i++)
                {
                    var filePath = ofd.FileNames[i];
                    var fileName = System.IO.Path.GetFileName(filePath);
                    fileDictionary.Add(fileName, filePath);
                    ListBoxPlayList.Items.Add(fileName);
                }
                ListBoxPlayList.SelectedIndex = listCount;
            }
        }

I am trying by this code:

But item remove from Dictionary but not remove from listbox when I click the remove button.

   private void remove(object sender, RoutedEventArgs e)
        {

            var itemsToRemove = listbox4.SelectedItems;
            foreach (var item in itemsToRemove)
            {
                fileDictionary.Remove(item.ToString());
                listbox4.Items.Remove(item);
            }

        }

Note:

I want to remove item from listbox & fileDictionary at once.

& Without the playing item.

This code worked when I don't use dictionary.

private void removebtn_Click(object sender, RoutedEventArgs e)
    {
     object[] itemsToRemove = new object[ListBoxPlayList.SelectedItems.Count];
                ListBoxPlayList.SelectedItems.CopyTo(itemsToRemove, 0);

                foreach (object item in itemsToRemove)
                {
   if (mediaelement.Source != new Uri(item.ToString()))  //MediaPlayer source
   ListBoxPlayList.Items.Remove(item);

}

}

Question:

How can I remove selected items from listbox & dictionary on click and ignore remove item which is playing on my mediaelement??

Proper way to do this, a model your form would work against, with commands for adding/removing, finally an observable collection does notify subscribers to changes in it. Here's an example : code.msdn.microsoft.com/windowsdesktop/… — aybe

Kosala W Kosala W · Accepted Answer · 2016-08-24T04:48:12

You are almost there. Always use parenthesis until you are familiar with the basics. Read my comments below.

private void removebtn_Click(object sender, RoutedEventArgs e)
{
     object[] itemsToRemove = new object[ListBoxPlayList.SelectedItems.Count];
     ListBoxPlayList.SelectedItems.CopyTo(itemsToRemove, 0);

     foreach (object item in itemsToRemove)
     {
         string filePath;
         fileDictionary.TryGetValue(item.ToString(), out filePath);
         if (mediaelement.Source != new Uri(filePath))  //MediaPlayer source
         {  //you forgot the parenthesis for the if condition.
            ListBoxPlayList.Items.Remove(item);//remove from list
            fileDictionary.Remove(item.ToString());//remove from dictionary
         }
     }
}

How to remove item listbox & dictionary on click?

2 Answers