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dotnet compact framework
group:Treeview loading with BeginUpdate&EndUpdate
dotnet compact framework:
As is known to all, the Treeview::BeginUpdate/EndUpdate method is used to update or reload the treeview without redrawing the treenode one by one,and it can save some performance for us.But here i'm writing an example that,however,doesn's make any difference with or without these two method.Here's my code: public partial class Form1 : Form { public Form1() { InitializeComponent(); } void TestTreeViewLoad(bool async) { int start = Environment.TickCount; int end = 0; // // Use the BeginUpdate/EndUpdate asynchronized or not? // //if (async) treeView1.BeginUpdate(); treeView1.Nodes.Clear(); end = Environment.TickCount; Debug.WriteLine("Treeview Clear time (ms): " + (end - start)); // // Root node // TreeNode tn = new TreeNode(@"\"); treeView1.Nodes.Add(tn); DirectoryInfo rootDir = new DirectoryInfo(@"\"); end = Environment.TickCount; Debug.WriteLine("Treeview Addtoot time (ms): " + (end - start)); // // Update the TreeView control with the directory tree // UpdateTreeView(tn, rootDir); treeView1.Nodes[0].Expand(); end = Environment.TickCount; Debug.WriteLine("Treeview update time (ms): " + (end - start)); //if (async) // treeView1.EndUpdate(); treeView1.EndUpdate(); end = Environment.TickCount; Debug.WriteLine("Treeview load time (ms): " + (end - start)); } // // Recursively update tree view // private void UpdateTreeView(TreeNode tn, DirectoryInfo dir) { // // Display folder names; Recursively call the method // foreach (DirectoryInfo di in dir.GetDirectories()) { TreeNode tn2 = new TreeNode(di.Name); tn.Nodes.Add(tn2); UpdateTreeView(tn2, di); } // // Display file names // foreach (FileInfo fi in dir.GetFiles()) { TreeNode tn3 = new TreeNode(fi.Name); tn.Nodes.Add(tn3); } } private void menuItem1_Click(object sender, EventArgs e) { TestTreeViewLoad(true); } } *********Output with aysnc update********** Treeview Addtoot time (ms): 687 Treeview update time (ms): 5177 Treeview load time (ms): 5260 *********Output without aysnc update********** Treeview Addtoot time (ms): 697 Treeview update time (ms): 5197 Treeview load time (ms): 5280 Obviously,the update operation takes a long time,and it seems that BeginUpdate&EndUpdate doesn't work... Any suggustion about that? Thanks in advance Regards
[quoted text, click to view]
On Mar 25, 8:10=A0pm, Freesc <hjd.cl...@gmail.com> wrote: > Hi there~ > > As is known to all, the Treeview::BeginUpdate/EndUpdate method is used > to update or reload the treeview without redrawing the treenode one by > one,and it can save some performance for us.But here i'm writing an > example that,however,doesn's make any difference with or without these > two method.Here's my code: > > =A0 =A0 public partial class Form1 : Form > =A0 =A0 { > =A0 =A0 =A0 =A0 public Form1() > =A0 =A0 =A0 =A0 { > =A0 =A0 =A0 =A0 =A0 =A0 InitializeComponent(); > =A0 =A0 =A0 =A0 } > > =A0 =A0 =A0 =A0 void TestTreeViewLoad(bool async) > =A0 =A0 =A0 =A0 { > =A0 =A0 =A0 =A0 =A0 =A0 int start =3D Environment.TickCount; > =A0 =A0 =A0 =A0 =A0 =A0 int end =3D 0; > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 // Use the BeginUpdate/EndUpdate asynchronized or = not? > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 //if (async) > =A0 =A0 =A0 =A0 =A0 treeView1.BeginUpdate(); > > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.Nodes.Clear(); > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > =A0 =A0 =A0 =A0 =A0 =A0Debug.WriteLine("Treeview Clear time (ms): " + (end= - > start)); > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 // Root node > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 TreeNode tn =3D new TreeNode(@"\"); > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.Nodes.Add(tn); > =A0 =A0 =A0 =A0 =A0 =A0 DirectoryInfo rootDir =3D new DirectoryInfo(@"\");= > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > =A0 =A0 =A0 =A0 =A0 =A0 Debug.WriteLine("Treeview Addtoot time (ms): " + (= end - > start)); > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 // Update the TreeView control with the directory = tree > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 UpdateTreeView(tn, rootDir); > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.Nodes[0].Expand(); > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > =A0 =A0 =A0 =A0 =A0 =A0 Debug.WriteLine("Treeview update time (ms): " + (e= nd - > start)); > > =A0 =A0 =A0 =A0 =A0 =A0 //if (async) > =A0 =A0 =A0 =A0 =A0 =A0 // =A0 =A0treeView1.EndUpdate(); > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.EndUpdate(); > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > > =A0 =A0 =A0 =A0 =A0 =A0 Debug.WriteLine("Treeview load time (ms): " + (end= - > start)); > =A0 =A0 =A0 =A0 } > > =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 // Recursively update tree view > =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 private void UpdateTreeView(TreeNode tn, DirectoryInfo dir= ) > =A0 =A0 =A0 =A0 { > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 // Display folder names; Recursively call the meth= od > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 foreach (DirectoryInfo di in dir.GetDirectories())= > =A0 =A0 =A0 =A0 =A0 =A0 { > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 TreeNode tn2 =3D new TreeNode(di.Name); > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 tn.Nodes.Add(tn2); > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 UpdateTreeView(tn2, di); > =A0 =A0 =A0 =A0 =A0 =A0 } > > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 // Display file names > =A0 =A0 =A0 =A0 =A0 =A0 // > =A0 =A0 =A0 =A0 =A0 =A0 foreach (FileInfo fi in dir.GetFiles()) > =A0 =A0 =A0 =A0 =A0 =A0 { > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 TreeNode tn3 =3D new TreeNode(fi.Name); > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 tn.Nodes.Add(tn3); > =A0 =A0 =A0 =A0 =A0 =A0 } > =A0 =A0 =A0 =A0 } > =A0 =A0 =A0 =A0 private void menuItem1_Click(object sender, EventArgs e) > =A0 =A0 =A0 =A0 { > =A0 =A0 =A0 =A0 =A0 =A0 TestTreeViewLoad(true); > =A0 =A0 =A0 =A0 } > =A0 =A0 } > > *********Output with aysnc update********** > Treeview Addtoot time (ms): 687 > Treeview update time (ms): 5177 > Treeview load time (ms): 5260 > > *********Output without aysnc update********** > Treeview Addtoot time (ms): 697 > Treeview update time (ms): 5197 > Treeview load time (ms): 5280 > > Obviously,the update operation takes a long time,and it seems that > BeginUpdate&EndUpdate doesn't work... > > Any suggustion about that? > > Thanks in advance > > Regards > Freesc In addition, i'm using IBM thinkpad X60+VS2008+.NET CF3.5+WM6 Standard Emulator for developing and test :-)
[quoted text, click to view]
On Mar 25, 7:10 am, Freesc <hjd.cl...@gmail.com> wrote: > Hi there~ > > As is known to all, the Treeview::BeginUpdate/EndUpdate method is used > to update or reload the treeview without redrawing the treenode one by > one,and it can save some performance for us.But here i'm writing an > example that,however,doesn's make any difference with or without these > two method.Here's my code: > > public partial class Form1 : Form > { > public Form1() > { > InitializeComponent(); > } > > void TestTreeViewLoad(bool async) > { > int start = Environment.TickCount; > int end = 0; > // > // Use the BeginUpdate/EndUpdate asynchronized or not? > // > //if (async) > treeView1.BeginUpdate(); > > treeView1.Nodes.Clear(); > end = Environment.TickCount; > Debug.WriteLine("Treeview Clear time (ms): " + (end - > start)); > // > // Root node > // > TreeNode tn = new TreeNode(@"\"); > treeView1.Nodes.Add(tn); > DirectoryInfo rootDir = new DirectoryInfo(@"\"); > end = Environment.TickCount; > Debug.WriteLine("Treeview Addtoot time (ms): " + (end - > start)); > // > // Update the TreeView control with the directory tree > // > UpdateTreeView(tn, rootDir); > treeView1.Nodes[0].Expand(); > end = Environment.TickCount; > Debug.WriteLine("Treeview update time (ms): " + (end - > start)); > > //if (async) > // treeView1.EndUpdate(); > treeView1.EndUpdate(); > end = Environment.TickCount; > > Debug.WriteLine("Treeview load time (ms): " + (end - > start)); > } > > // > // Recursively update tree view > // > private void UpdateTreeView(TreeNode tn, DirectoryInfo dir) > { > // > // Display folder names; Recursively call the method > // > foreach (DirectoryInfo di in dir.GetDirectories()) > { > TreeNode tn2 = new TreeNode(di.Name); > tn.Nodes.Add(tn2); > UpdateTreeView(tn2, di); > } > > // > // Display file names > // > foreach (FileInfo fi in dir.GetFiles()) > { > TreeNode tn3 = new TreeNode(fi.Name); > tn.Nodes.Add(tn3); > } > } > private void menuItem1_Click(object sender, EventArgs e) > { > TestTreeViewLoad(true); > } > } > > *********Output with aysnc update********** > Treeview Addtoot time (ms): 687 > Treeview update time (ms): 5177 > Treeview load time (ms): 5260 > > *********Output without aysnc update********** > Treeview Addtoot time (ms): 697 > Treeview update time (ms): 5197 > Treeview load time (ms): 5280 > > Obviously,the update operation takes a long time,and it seems that > BeginUpdate&EndUpdate doesn't work... > > Any suggustion about that? > > Thanks in advance > > Regards > Freesc I think you're reading into BeginUpdate and EndUpdate a bit too much. Your example seems to indicate the that majority of your run time is due to retrieving the directory information. The advantages of BeginUpdate and EndUpdate functions will be more obvious if the information being loaded is, for example, from a memory variable like an array. These function simply prevent the control from updating as the items are added or modified, thus eliminating the unnecessary visual processing. Depending on the amount of data involved, this may
[quoted text, click to view]
On Mar 26, 12:59=A0am, Jin Chang <jinsooch...@gmail.com> wrote: > On Mar 25, 7:10 am, Freesc <hjd.cl...@gmail.com> wrote: > > > > > > > Hi there~ > > > As is known to all, the Treeview::BeginUpdate/EndUpdate method is used > > to update or reload the treeview without redrawing the treenode one by > > one,and it can save some performance for us.But here i'm writing an > > example that,however,doesn's make any difference with or without these > > two method.Here's my code: > > > =A0 =A0 public partial class Form1 : Form > > =A0 =A0 { > > =A0 =A0 =A0 =A0 public Form1() > > =A0 =A0 =A0 =A0 { > > =A0 =A0 =A0 =A0 =A0 =A0 InitializeComponent(); > > =A0 =A0 =A0 =A0 } > > > =A0 =A0 =A0 =A0 void TestTreeViewLoad(bool async) > > =A0 =A0 =A0 =A0 { > > =A0 =A0 =A0 =A0 =A0 =A0 int start =3D Environment.TickCount; > > =A0 =A0 =A0 =A0 =A0 =A0 int end =3D 0; > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 // Use the BeginUpdate/EndUpdate asynchronized o= r not? > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 //if (async) > > =A0 =A0 =A0 =A0 =A0 treeView1.BeginUpdate(); > > > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.Nodes.Clear(); > > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > > =A0 =A0 =A0 =A0 =A0 =A0Debug.WriteLine("Treeview Clear time (ms): " + (e= nd - > > start)); > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 // Root node > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 TreeNode tn =3D new TreeNode(@"\"); > > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.Nodes.Add(tn); > > =A0 =A0 =A0 =A0 =A0 =A0 DirectoryInfo rootDir =3D new DirectoryInfo(@"\"= ); > > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > > =A0 =A0 =A0 =A0 =A0 =A0 Debug.WriteLine("Treeview Addtoot time (ms): " += (end - > > start)); > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 // Update the TreeView control with the director= y tree > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 UpdateTreeView(tn, rootDir); > > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.Nodes[0].Expand(); > > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > > =A0 =A0 =A0 =A0 =A0 =A0 Debug.WriteLine("Treeview update time (ms): " + = (end - > > start)); > > > =A0 =A0 =A0 =A0 =A0 =A0 //if (async) > > =A0 =A0 =A0 =A0 =A0 =A0 // =A0 =A0treeView1.EndUpdate(); > > =A0 =A0 =A0 =A0 =A0 =A0 treeView1.EndUpdate(); > > =A0 =A0 =A0 =A0 =A0 =A0 end =3D Environment.TickCount; > > > =A0 =A0 =A0 =A0 =A0 =A0 Debug.WriteLine("Treeview load time (ms): " + (e= nd - > > start)); > > =A0 =A0 =A0 =A0 } > > > =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 // Recursively update tree view > > =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 private void UpdateTreeView(TreeNode tn, DirectoryInfo d= ir) > > =A0 =A0 =A0 =A0 { > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 // Display folder names; Recursively call the me= thod > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 foreach (DirectoryInfo di in dir.GetDirectories(= )) > > =A0 =A0 =A0 =A0 =A0 =A0 { > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 TreeNode tn2 =3D new TreeNode(di.Name); > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 tn.Nodes.Add(tn2); > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 UpdateTreeView(tn2, di); > > =A0 =A0 =A0 =A0 =A0 =A0 } > > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 // Display file names > > =A0 =A0 =A0 =A0 =A0 =A0 // > > =A0 =A0 =A0 =A0 =A0 =A0 foreach (FileInfo fi in dir.GetFiles()) > > =A0 =A0 =A0 =A0 =A0 =A0 { > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 TreeNode tn3 =3D new TreeNode(fi.Name); > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 tn.Nodes.Add(tn3); > > =A0 =A0 =A0 =A0 =A0 =A0 } > > =A0 =A0 =A0 =A0 } > > =A0 =A0 =A0 =A0 private void menuItem1_Click(object sender, EventArgs e)= > > =A0 =A0 =A0 =A0 { > > =A0 =A0 =A0 =A0 =A0 =A0 TestTreeViewLoad(true); > > =A0 =A0 =A0 =A0 } > > =A0 =A0 } > > > *********Output with aysnc update********** > > Treeview Addtoot time (ms): 687 > > Treeview update time (ms): 5177 > > Treeview load time (ms): 5260 > > > *********Output without aysnc update********** > > Treeview Addtoot time (ms): 697 > > Treeview update time (ms): 5197 > > Treeview load time (ms): 5280 > > > Obviously,the update operation takes a long time,and it seems that > > BeginUpdate&EndUpdate doesn't work... > > > Any suggustion about that? > > > Thanks in advance > > > Regards > > Freesc > > I think you're reading into BeginUpdate and EndUpdate a bit too much. > Your example seems to indicate the that majority of your run time is > due to retrieving the directory information. =A0The advantages of > BeginUpdate and EndUpdate functions will be more obvious if the > information being loaded is, for example, from a memory variable like > an array. =A0These function simply prevent the control from updating as > the items are added or modified, thus eliminating the unnecessary > visual processing. =A0Depending on the amount of data involved, this may > or may not have noticeable impact on the performance.- Hide quoted text - > > - Show quoted text - Jin, Thanks for your reply. I think i got some twisted about BeginUpdate/EndUpdate, and now i'm clear :) the majority of the performance is due to retrieving the directory information,not the refreshing of the treeview thx & regards Freesc
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