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POC# ListView doesn't update
 

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    <p>I reckon the problem of C# win forms not being repainted well in certain circumstances is covered in different places, however, I didn't manage to solve my problems by using the simple snippets I found on the web.</p> <p>My problem : on a form I have a listView, which I associate to a custom data holder (2 columns, a key and a last update date). From diverse places, I need to call the updateTime(key) method which then replicated the changes in the GUI. The model gets changed but my listView never.</p> <p><strong>I have a form containing a ListView that looks like that :</strong></p> <pre><code>partial class VolsPane : UserControl, IGUIPane { private ListView listView1; private ListModel listModel1; //ListModel is 100% homemade ... public VolsPane() { ... listModel1.setList(listView1); } } </code></pre> <p><strong>And the class holding data for my listView is like that :</strong></p> <pre><code>class ListModel { private Dictionary&lt;string, DateTime&gt; Underlying; private ListView list; ... public ListModel(string nexusKey) { ... } ... public void setList(ListView list) { this.list = list; } public void updateTime(string ric) { Underlying[ric] = DateTime.UtcNow; updateView(); } public void updateView() { this.list.Clear(); this.list.Items.AddRange(this.underlyingToListItems()); } ... public ListViewItem[] underlyingToListItems() { ListViewItem[] res = new ListViewItem[Underlying.Keys.Count]; int i = 0; foreach (string ric in Underlying.Keys) { res[i] = new ListViewItem(new string[] { ric, Underlying[ric].ToString("MMM-dd hh:mm:ss") }); i++; } return res; } } </code></pre> <p>I do realize the problem is in my updateView(). In debug, the code goes there definitely. Believing the problem was to be solved with an asynchronous "invoke", I referred to this post which appeared to be a reference : <a href="https://stackoverflow.com/questions/2367718/c-automating-the-invokerequired-code-pattern">Stack overflow : Automating the invoke...</a></p> <p><strong>Then tried this :</strong></p> <pre><code> private void updateView() { if (this.list.InvokeRequired) { this.list.Invoke(new MethodInvoker(() =&gt; { updateView(); })); } else { this.list.Items.Clear(); //this.list.Clear(); this.list.Items.AddRange(this.underlyingToListItems()); } } </code></pre> <p>It builds but has no effect. In debug mode, never goes in the 'if' branch, always the 'else'.</p> <p><strong>Then this :</strong></p> <pre><code> private void updateView() { this.list.Invoke((MethodInvoker)delegate { this.list.Items.Clear(); //this.list.Clear(); this.list.Items.AddRange(this.underlyingToListItems()); }); } </code></pre> <p>I get an "InvalidOperationException : Invoke or BeginInvoke cannot be called on a control until the window handle has been created."</p> <p>What is the obvious thing I must be missing here ? Or is my problem actually not the one i think ?</p> <p>Thanks guys !</p>
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