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POWinForms ListView draws HELL SLOW in Windows 7 Compared to XP
 

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  1. POWinForms ListView draws HELL SLOW in Windows 7 Compared to XP
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    <p>I'm using ListView in VirtualMode and Details View with small icons.</p> <p>This ListView have like 100,000 items inside.</p> <p>The problem is that drawing this listview is much slower in Windows 7 compared to XP.</p> <p>You can fill the slow drawing while scrolling the ListView or while multi-selecting items.</p> <p>Additionally, i noticed that drawing become slower with each column added.</p> <p>RetrieveVirtualItem event handler for now doing nothing but return literal values, so this is not the bottleneck.</p> <p>Any ideas?</p> <p>UPDATE: Source code for reproduce:</p> <p>FlickerFreeListView.cs:</p> <pre><code>using System; using System.Collections.Generic; using System.Text; using System.Windows.Forms; using System.Runtime.InteropServices; using System.ComponentModel; using System.Drawing; using System.Reflection; using System.Diagnostics; namespace ListViewTest { public class FlickerFreeListView : ListView { public FlickerFreeListView() { base.SetStyle(ControlStyles.OptimizedDoubleBuffer | ControlStyles.AllPaintingInWmPaint, true); } } } </code></pre> <p>Form1.cs:</p> <pre><code>using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Linq; using System.Text; using System.Windows.Forms; using System.Diagnostics; namespace ListViewTest { public partial class Form1 : Form { public Form1() { InitializeComponent(); _item = new ListViewItem(new string[6]); } private ListViewItem _item; private void listView1_RetrieveVirtualItem(object sender, RetrieveVirtualItemEventArgs e) { string itemIndexStr = e.ItemIndex.ToString(); _item.Text = itemIndexStr; _item.SubItems[1].Text = "blablablablablablablablablablablablablablablablablablablablablablablablablablablablablablablablabla"; _item.SubItems[2].Text = itemIndexStr; _item.SubItems[3].Text = itemIndexStr; _item.SubItems[4].Text = itemIndexStr; _item.SubItems[5].Text = itemIndexStr; e.Item = _item; } } } </code></pre> <p>Form1.Designer.cs:</p> <pre><code>namespace ListViewTest { partial class Form1 { /// &lt;summary&gt; /// Required designer variable. /// &lt;/summary&gt; private System.ComponentModel.IContainer components = null; /// &lt;summary&gt; /// Clean up any resources being used. /// &lt;/summary&gt; /// &lt;param name="disposing"&gt;true if managed resources should be disposed; otherwise, false.&lt;/param&gt; protected override void Dispose(bool disposing) { if (disposing &amp;&amp; (components != null)) { components.Dispose(); } base.Dispose(disposing); } #region Windows Form Designer generated code /// &lt;summary&gt; /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// &lt;/summary&gt; private void InitializeComponent() { this.listView1 = new ListViewTest.FlickerFreeListView(); this.columnHeader1 = new System.Windows.Forms.ColumnHeader(); this.columnHeader2 = new System.Windows.Forms.ColumnHeader(); this.columnHeader3 = new System.Windows.Forms.ColumnHeader(); this.columnHeader4 = new System.Windows.Forms.ColumnHeader(); this.columnHeader5 = new System.Windows.Forms.ColumnHeader(); this.columnHeader6 = new System.Windows.Forms.ColumnHeader(); this.SuspendLayout(); // // listView1 // this.listView1.AutoArrange = false; this.listView1.Columns.AddRange(new System.Windows.Forms.ColumnHeader[] { this.columnHeader1, this.columnHeader2, this.columnHeader3, this.columnHeader4, this.columnHeader5, this.columnHeader6}); this.listView1.Dock = System.Windows.Forms.DockStyle.Fill; this.listView1.FullRowSelect = true; this.listView1.HideSelection = false; this.listView1.Location = new System.Drawing.Point(0, 0); this.listView1.Name = "listView1"; this.listView1.Size = new System.Drawing.Size(1032, 388); this.listView1.TabIndex = 0; this.listView1.UseCompatibleStateImageBehavior = false; this.listView1.View = System.Windows.Forms.View.Details; this.listView1.VirtualListSize = 100000; this.listView1.VirtualMode = true; this.listView1.RetrieveVirtualItem += new System.Windows.Forms.RetrieveVirtualItemEventHandler(this.listView1_RetrieveVirtualItem); // // columnHeader1 // this.columnHeader1.Width = 92; // // columnHeader2 // this.columnHeader2.Width = 405; // // Form1 // this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F); this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font; this.ClientSize = new System.Drawing.Size(1032, 388); this.Controls.Add(this.listView1); this.Name = "Form1"; this.Text = "Form1"; this.WindowState = System.Windows.Forms.FormWindowState.Maximized; this.ResumeLayout(false); } #endregion private FlickerFreeListView listView1; private System.Windows.Forms.ColumnHeader columnHeader1; private System.Windows.Forms.ColumnHeader columnHeader2; private System.Windows.Forms.ColumnHeader columnHeader3; private System.Windows.Forms.ColumnHeader columnHeader4; private System.Windows.Forms.ColumnHeader columnHeader5; private System.Windows.Forms.ColumnHeader columnHeader6; } } </code></pre>
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    1. CODo you have the latest graphics drivers installed for your card?
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    2. COLatest graphics drivers installed. This problem can be reproduced on every machine.
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    3. COHow are you filling the items in the listview? Can you show the code you are using the fill in the listview items?
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      1. USChuck Haines
 

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Guidance
A row detail

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.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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