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POHow can I sort an ObservableCollection<T> that's bound to a ListBoxControl?
 

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  1. POHow can I sort an ObservableCollection<T> that's bound to a ListBoxControl?
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    <p>I've got a winform app that uses 2 DevExpress ListBoxControls that a user can move items from one to the other. The box on the left has "All available" Sections while the box on the right has what's currently assigned to the user. I am new to Generics but am trying to implement them in this project. Each ListBoxControl is bound to an ObservableCollection via it's DataSource:</p> <pre><code>ObservableCollection&lt;Sections&gt; allSections = new ObservableCollection&lt;Sections&gt;((dbContext.Sections .OrderBy(s =&gt; s.SectionName).AsEnumerable&lt;Sections&gt;())); listboxAllSections.DataSource = allSections; listboxAllSections.DisplayMember = "SectionName"; listboxAllSections.ValueMember = "SectionID"; </code></pre> <p>So I have 4 buttons in between each listbox to allow the user to move items back and forth:</p> <p>MoveRight <code>&gt;</code><br> MoveAllRight <code>&gt;&gt;</code><br> MoveLeft <code>&lt;</code><br> MoveAllLeft <code>&lt;&lt;</code></p> <p>For <code>MoveRight</code> and <code>MoveLeft</code> I created this Generic function:</p> <pre><code>private void MoveItem&lt;T&gt;(ListBoxControl source, ListBoxControl target) { ObservableCollection&lt;T&gt; sourceItems = (ObservableCollection&lt;T&gt;)source.DataSource; ObservableCollection&lt;T&gt; targetItems = (ObservableCollection&lt;T&gt;)target.DataSource; target.BeginUpdate(); //Add items to target. foreach (T item in source.SelectedItems) targetItems.Add(item); //Remove items from source. for (int x = 0; x &lt; source.SelectedItems.Count; x++) sourceItems.Remove((T)source.SelectedItems[x]); target.EndUpdate(); } </code></pre> <p>All works great, but I would like to add sorting to it. I don't need sorting when moving items to the right, only when moving items to the left. I can't figure out how to sort a generic collection based on a certain property. For instance, <code>Sections</code> has a property called <code>SectionName</code> that I'd like to sort on. I can do this if I use the actual type:</p> <pre><code>ObservableCollection&lt;Sections&gt; sourceItems = (ObservableCollection&lt;Sections&gt;)listboxAllSections.DataSource; var sortedItems = new ObservableCollection&lt;Sections&gt;(); foreach (var item in sourceItems.OrderBy(t =&gt; t.SectionName)) sortedItems.Add(item); listboxAllSections.DataSource = sortedItems; </code></pre> <p>But I don't know how to make this generic to that <code>sourceItems.OrderBy(t =&gt; t.SectionName)</code> can be the field of the Type that's passed in.</p> <p>Any help/guidance is appreciated!</p>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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