TreeView problem

[feel]

Goin' crazy with this recursive function ported from delphi...
I send a string like DirA/ DirB /DirC but i get in the treeView
each one in a new node.Cant get the child node....!!
-DirA
-DirB
-DirC
instead of:
DirA
|
- DirB
|
-DirC

Could anyone have a look of this code?.Thanks.
There'a listarray to store the path to avoid double nodes(dont works).

private void LoadNode(string path)

{

string s;

int p,ix;


if (path != "")

{s=path;

}

else

{

s="<EmptyPath>" ;

}

p=myAL1.IndexOf (s);

if(p >= 0)

{

treeView1.Nodes .Add(myAL1[p].ToString());

}

else

{

p=-1;

//find pos of final separator

string Del = @"\";

for (ix=s.Length-1;ix >=0;ix--)

{

int answer = System.String.C ompare(s[ix].ToString(),Del );

string mm=s[ix].ToString();

if (answer==0)

{

p=ix;

break;

}

}

if (p< 0)

{

node= null;

}

else

{

LoadNode(s.Subs tring(0,p));

s=s.Substring(p ,s.Length-p);

}


treeView1.Nodes .Add(s);

treeView1.Selec tedNode=node;


myAL1.Add(s);

}

}

[Frank Eller [MVP]]

Re: TreeView problem

Hi,
[color=blue]
> Goin' crazy with this recursive function ported from delphi...[/color]

There's the problem - Delphis TreeView works completely different from the
..NET one.
[color=blue]
> I send a string like DirA/ DirB /DirC but i get in the treeView
> each one in a new node.Cant get the child node....!!
> -DirA
> -DirB
> -DirC
> instead of:
> DirA
> |
> - DirB
> |
> -DirC
>[/color]

Have you ever worked with a list, where each element has a pointer to the
next and the previous element? That's exactly how the TreeView works. If you
add a string to the Nodes-Collection, it gives you the TreeNode back you
just added (well, as a TreeNode-object of course). You must use this
TreeNode's "Nodes"-Collection to add a subnode.

The following code is the complete (!) code of a little Application I wrote
for a book. It's in german, but you should understand the C#-Code anyway. If
you want, create a new App and replace the whole code of Form1 with the code
below and it should work.

=============== =========
using System;
using System.Drawing;
using System.Collecti ons;
using System.Componen tModel;
using System.Windows. Forms;
using System.Data;
using System.IO;

namespace ListDirectories {
/// <summary>
/// Zusammendfassen de Beschreibung für Form1.
/// </summary>
public class FrmMain : System.Windows. Forms.Form {
private System.Windows. Forms.Label label1;
private System.Windows. Forms.Button btnReadAll;
private System.Windows. Forms.Button btnExit;
private System.Windows. Forms.ImageList imlDrives;
private System.Windows. Forms.TreeView trvDirectories;
private System.Windows. Forms.CheckBox chkRootLines;
private System.Windows. Forms.CheckBox chkPlusMinus;
private System.Windows. Forms.CheckBox chkLines;
private System.Windows. Forms.Label label2;
private System.Windows. Forms.TextBox txtDirCount;
private System.Componen tModel.IContain er components;

public FrmMain() {
//
// Erforderlich für die Windows Form-Designerunterst ützung
//
InitializeCompo nent();

//
// TODO: Fügen Sie den Konstruktorcode nach dem Aufruf von
InitializeCompo nent hinzu
//
}

/// <summary>
/// Die verwendeten Ressourcen bereinigen.
/// </summary>
protected override void Dispose( bool disposing ) {
if( disposing ) {
if (components != null) {
components.Disp ose();
}
}
base.Dispose( disposing );
}

#region Windows Form Designer generated code
/// <summary>
/// Erforderliche Methode für die Designerunterst ützung.
/// Der Inhalt der Methode darf nicht mit dem Code-Editor geändert
werden.
/// </summary>
private void InitializeCompo nent() {
this.components = new System.Componen tModel.Containe r();
System.Resource s.ResourceManag er resources = new
System.Resource s.ResourceManag er(typeof(FrmMa in));
this.trvDirecto ries = new System.Windows. Forms.TreeView( );
this.imlDrives = new System.Windows. Forms.ImageList (this.component s);
this.label1 = new System.Windows. Forms.Label();
this.btnReadAll = new System.Windows. Forms.Button();
this.chkRootLin es = new System.Windows. Forms.CheckBox( );
this.chkPlusMin us = new System.Windows. Forms.CheckBox( );
this.chkLines = new System.Windows. Forms.CheckBox( );
this.btnExit = new System.Windows. Forms.Button();
this.label2 = new System.Windows. Forms.Label();
this.txtDirCoun t = new System.Windows. Forms.TextBox() ;
this.SuspendLay out();
//
// trvDirectories
//
this.trvDirecto ries.ImageList = this.imlDrives;
this.trvDirecto ries.Location = new System.Drawing. Point(12, 32);
this.trvDirecto ries.Name = "trvDirectories ";
this.trvDirecto ries.Size = new System.Drawing. Size(296, 336);
this.trvDirecto ries.TabIndex = 0;
this.trvDirecto ries.MouseDown += new
System.Windows. Forms.MouseEven tHandler(this.t rvDirectories_M ouseDown);
this.trvDirecto ries.DoubleClic k += new
System.EventHan dler(this.trvDi rectories_Doubl eClick);
//
// imlDrives
//
this.imlDrives. ColorDepth =
System.Windows. Forms.ColorDept h.Depth24Bit;
this.imlDrives. ImageSize = new System.Drawing. Size(16, 16);
this.imlDrives. ImageStream =
((System.Window s.Forms.ImageLi stStreamer)(res ources.GetObjec t("imlDrives.Im a
geStream")));
this.imlDrives. TransparentColo r = System.Drawing. Color.Transpare nt;
//
// label1
//
this.label1.Aut oSize = true;
this.label1.Loc ation = new System.Drawing. Point(12, 16);
this.label1.Nam e = "label1";
this.label1.Siz e = new System.Drawing. Size(78, 13);
this.label1.Tab Index = 1;
this.label1.Tex t = "Verzeichnisse: ";
//
// btnReadAll
//
this.btnReadAll .Location = new System.Drawing. Point(316, 32);
this.btnReadAll .Name = "btnReadAll ";
this.btnReadAll .Size = new System.Drawing. Size(168, 23);
this.btnReadAll .TabIndex = 2;
this.btnReadAll .Text = "Alle Verzeichnisse einlesen";
this.btnReadAll .Click += new
System.EventHan dler(this.btnRe adAll_Click);
//
// chkRootLines
//
this.chkRootLin es.Checked = true;
this.chkRootLin es.CheckState =
System.Windows. Forms.CheckStat e.Checked;
this.chkRootLin es.Location = new System.Drawing. Point(316, 64);
this.chkRootLin es.Name = "chkRootLin es";
this.chkRootLin es.Size = new System.Drawing. Size(168, 24);
this.chkRootLin es.TabIndex = 3;
this.chkRootLin es.Text = "Wurzellini en";
this.chkRootLin es.Click += new
System.EventHan dler(this.chkRo otLines_Click);
//
// chkPlusMinus
//
this.chkPlusMin us.Checked = true;
this.chkPlusMin us.CheckState =
System.Windows. Forms.CheckStat e.Checked;
this.chkPlusMin us.Location = new System.Drawing. Point(316, 88);
this.chkPlusMin us.Name = "chkPlusMin us";
this.chkPlusMin us.Size = new System.Drawing. Size(168, 24);
this.chkPlusMin us.TabIndex = 4;
this.chkPlusMin us.Text = "Plus-/Minus";
this.chkPlusMin us.Click += new
System.EventHan dler(this.chkPl usMinus_Click);
//
// chkLines
//
this.chkLines.C hecked = true;
this.chkLines.C heckState = System.Windows. Forms.CheckStat e.Checked;
this.chkLines.L ocation = new System.Drawing. Point(316, 112);
this.chkLines.N ame = "chkLines";
this.chkLines.S ize = new System.Drawing. Size(168, 24);
this.chkLines.T abIndex = 5;
this.chkLines.T ext = "Hierarchielini en";
this.chkLines.C lick += new System.EventHan dler(this.chkLi nes_Click);
//
// btnExit
//
this.btnExit.Lo cation = new System.Drawing. Point(316, 344);
this.btnExit.Na me = "btnExit";
this.btnExit.Si ze = new System.Drawing. Size(168, 23);
this.btnExit.Ta bIndex = 6;
this.btnExit.Te xt = "Beenden";
this.btnExit.Cl ick += new System.EventHan dler(this.btnEx it_Click);
//
// label2
//
this.label2.Aut oSize = true;
this.label2.Loc ation = new System.Drawing. Point(316, 144);
this.label2.Nam e = "label2";
this.label2.Siz e = new System.Drawing. Size(126, 13);
this.label2.Tab Index = 7;
this.label2.Tex t = "Gelistete Verzeichnisse:" ;
//
// txtDirCount
//
this.txtDirCoun t.Location = new System.Drawing. Point(316, 164);
this.txtDirCoun t.Name = "txtDirCoun t";
this.txtDirCoun t.ReadOnly = true;
this.txtDirCoun t.Size = new System.Drawing. Size(52, 20);
this.txtDirCoun t.TabIndex = 8;
this.txtDirCoun t.Text = "";
//
// FrmMain
//
this.AutoScaleB aseSize = new System.Drawing. Size(5, 13);
this.ClientSize = new System.Drawing. Size(492, 381);
this.Controls.A ddRange(new System.Windows. Forms.Control[] {

this.txtDirCoun t,

this.label2,

this.btnExit,

this.chkLines,

this.chkPlusMin us,

this.chkRootLin es,

this.btnReadAll ,

this.label1,

this.trvDirecto ries});
this.Name = "FrmMain";
this.Text = "Verzeichni sse einlesen";
this.Load += new System.EventHan dler(this.FrmMa in_Load);
this.ResumeLayo ut(false);

}
#endregion

/// <summary>
/// Der Haupteinstiegsp unkt für die Anwendung.
/// </summary>
[STAThread]
static void Main() {
Application.Run (new FrmMain());
}

/*
* Felder
*/
int iconDrive = 0;
int iconFolderClose d = 1;
int iconFolderOpen = 2;
Point mousePosition = new Point(0,0);

/*
* Eigene Methoden
*/
private void GetDirectories( TreeNode tn) {
DirectoryInfo dir = new DirectoryInfo(t n.FullPath);

try {
foreach (DirectoryInfo di in dir.GetDirector ies()) {
try {
tn.Nodes.Add(ne w TreeNode(di.Nam e, iconFolderClose d,
iconFolderOpen) );
} catch {
// Fehler ignorieren - Zugriff verweigert
}
}
} catch {
MessageBox.Show ("Es ist kein Datenträger im Laufwerk","Fehl er",
MessageBoxButto ns.OK, MessageBoxIcon. Stop);
}
UpdateDirectory Count();
}

private void GetAllDirectori es(TreeNode tn) {
if (tn.Nodes.Count ==0)
GetDirectories( tn);

foreach (TreeNode t in tn.Nodes)
GetAllDirectori es(t);
}

private void UpdateDirectory Count() {
txtDirCount.Tex t = trvDirectories. GetNodeCount(tr ue).ToString();
}

/*
* Ereignisse
*/
private void FrmMain_Load(ob ject sender, System.EventArg s e) {
string[] drives = Environment.Get LogicalDrives() ;
trvDirectories. Nodes.Clear();
foreach ( string s in drives )
trvDirectories. Nodes.Add(new TreeNode(s, iconDrive, iconDrive));
}

private void trvDirectories_ MouseDown(objec t sender,
System.Windows. Forms.MouseEven tArgs e) {
this.mousePosit ion.X = e.X;
this.mousePosit ion.Y = e.Y;
}

private void trvDirectories_ DoubleClick(obj ect sender, System.EventArg s
e) {
TreeNode tn = trvDirectories. GetNodeAt(this. mousePosition);
if ( (tn != null) && (tn.Nodes.Count ==0) )
GetDirectories( tn);
tn.Expand();
}

private void btnReadAll_Clic k(object sender, System.EventArg s e) {
// Alle Unterverzeichni sse des Knotens einlesen
TreeNode tn = trvDirectories. SelectedNode;

if ( tn != null) {
trvDirectories. BeginUpdate();
this.Cursor = Cursors.WaitCur sor;
GetAllDirectori es(tn);
this.Cursor = Cursors.Default ;
trvDirectories. EndUpdate();
tn.ExpandAll();
}
}

private void chkRootLines_Cl ick(object sender, System.EventArg s e) {
trvDirectories. ShowRootLines = chkRootLines.Ch ecked;
}

private void chkPlusMinus_Cl ick(object sender, System.EventArg s e) {
trvDirectories. ShowPlusMinus = chkPlusMinus.Ch ecked;
}

private void chkLines_Click( object sender, System.EventArg s e) {
trvDirectories. ShowLines = chkLines.Checke d;
}

private void btnExit_Click(o bject sender, System.EventArg s e) {
this.Close();
}
}
}

=============== ============

Hope this helps you a bit.


Regards,

Frank Eller

[feel]

Re: TreeView problem

[color=blue]
> Have you ever worked with a list, where each element has a pointer to the
> next and the previous element? That's exactly how the TreeView works. If[/color]
you[color=blue]
> add a string to the Nodes-Collection, it gives you the TreeNode back you
> just added (well, as a TreeNode-object of course). You must use this
> TreeNode's "Nodes"-Collection to add a subnode.
>
> The following code is the complete (!) code of a little Application I[/color]
wrote[color=blue]
> for a book. It's in german, but you should understand the C#-Code anyway.[/color]
If[color=blue]
> you want, create a new App and replace the whole code of Form1 with the[/color]
code[color=blue]
> below and it should work.[color=green]
> > Regards,[/color]
>
> Frank Eller
>
>
>[/color]
Thanks for you reply....yes your code is working :-)
but still fighting with recursive function and i need to check if a node is
already existing in the treeview.
Will study better your example and nodecollection.
Thanks anyway.

[Frans Bouma [C# MVP]]

Re: TreeView problem

feel wrote:
[color=blue]
>[color=green]
> > Have you ever worked with a list, where each element has a pointer to the
> > next and the previous element? That's exactly how the TreeView works. If[/color]
> you[color=green]
> > add a string to the Nodes-Collection, it gives you the TreeNode back you
> > just added (well, as a TreeNode-object of course). You must use this
> > TreeNode's "Nodes"-Collection to add a subnode.
> >
> > The following code is the complete (!) code of a little Application I[/color]
> wrote[color=green]
> > for a book. It's in german, but you should understand the C#-Code anyway.[/color]
> If[color=green]
> > you want, create a new App and replace the whole code of Form1 with the[/color]
> code[color=green]
> > below and it should work.[color=darkred]
> > > Regards,[/color]
> >[/color]
> Thanks for you reply....yes your code is working :-)
> but still fighting with recursive function and i need to check if a node is
> already existing in the treeview.
> Will study better your example and nodecollection.
> Thanks anyway.[/color]

Simply add every node you add to a hashtable as the KEY with null as the
value. You can then simply check if a node is already present in the tree by
calling the ContainsKey(nod eObject) method of the hashtable.

FB


--
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