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POTree View not showing update
 

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  1. POTree View not showing update
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    <p>I have a TreeView in my Windows Form user interface. I want to fill it up from a database, but it does not refresh ever, even though if I WriteLine() every node, it is in memory as I expect.</p> <p>In order to make it more easy to understand, I wrote a little example program that only has one button that creates a TreeView and a TreeView called treeView1 to display its content.</p> <p>If anyone can tell me where I have misunderstood the use of the TreeView, it would be a tremendous help.</p> <pre><code>private void button1_Click(object sender, EventArgs e) { // create a tree TreeView t = new TreeView(); TreeNode[] child = new TreeNode [1]; child[0]=new TreeNode("myCat"); child[0].Name = "IndependantOne"; TreeNode categoryNode = new TreeNode("catIdTag", child); categoryNode.Name = "Citizen Cat 5239002147"; t.Nodes.Add(categoryNode); // some stuff under the first node TreeNode[] mouseNode = new TreeNode[1]; mouseNode[0] = new TreeNode("myMouse"); mouseNode[0].Name = "SqueakyOne"; TreeNode[] childItem = new TreeNode[1]; childItem[0] = new TreeNode("mouseIdTag", mouseNode); childItem[0].Name = "Citizen Mouse 54655654649"; TreeNode eltNode = new TreeNode("Cheese", childItem); eltNode.Name = "Emmental"; t.Nodes["Citizen Cat 5239002147"].Nodes.Add(eltNode); // fill in the winform treeview if (t != null) { //treeView1.Visible = false; treeView1.BeginUpdate(); treeView1.Nodes.Clear(); treeView1.TopNode = t.TopNode; foreach (TreeNode n in t.Nodes) { treeView1.Nodes.Add(n); System.Diagnostics.Debug.WriteLine("Category Node contains: " + treeView1.Nodes[n.Name].Name + " at " + treeView1.Nodes[n.Name].Level); foreach (TreeNode no in treeView1.Nodes[n.Name].Nodes) { System.Diagnostics.Debug.WriteLine("Category Node Nodes contains: " + no.Name); } } /* This part I tried and it doesn't work either, still add it in the question if anyone knows if it's wiser? this.treeView1 = t; this.treeView1.Location = new System.Drawing.Point(233, 12); this.treeView1.Name = "treeView1"; this.treeView1.Size = new System.Drawing.Size(351, 277); this.treeView1.TabIndex = 11; this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect); */ treeView1.EndUpdate(); this.treeView1.Update(); this.treeView1.Refresh(); treeView1.Show(); //this.Refresh(); } } </code></pre> <p>I also tried setting the treeView1 with </p> <pre><code> treeView1 = t; </code></pre> <p>It was not a success...</p>
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    1. USKheldar
    1. USKheldar
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      1. VTUpMod
    1. COdrag and drop tree view to your form and set id as treeView1 and comment `TreeView t = new TreeView();` line of your code
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      1. USDamith
 

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