Treeview storage and reading

Using system;
Using system. Windows. forms;
Using system. xml;
Using system. Globalization;

Namespace treesample
{
/// <Summary>
/// Summary description for treefunctions.
/// </Summary>
Public class treefunctions
{
Public treefunctions ()
{
// Add constructor logic here
}

Internal system. xml. xmldocument tree2xml (Ref system. Windows. Forms. Treeview otreeview)
{
System. Text. stringbuilder stroutput = new system. Text. stringbuilder ();
Stroutput. append ("<? XML version =/"1.0/"?> /N ");
Stroutput. append ("Inclutreenodes (otreeview. nodes, ref stroutput );
Stroutput. append ("

System. xml. xmldocument oxml = new system. xml. xmldocument ();
Try
{
Oxml. loadxml (stroutput. tostring ());
}
Catch (system. xml. xmlexception excxml)
{
MessageBox. Show ("cannot load XML ");
Application. Exit ();
}
Return oxml;
}

Private void implements treenodes (system. Windows. Forms. treenodecollection xnodecol, Ref system. Text. stringbuilder Strout)
{
Foreach (enhancedtreenode xnode in xnodecol)
{
Strout. append ("<node id =/" "+ xnode. itemid. tostring (cultureinfo. invariantculture) + "/" position =/"" + xnode. index + "/">/N ");
Strout. append ("<! [CDATA ["+ xnode. itemname +"]>/N ");
If (xnode. getnodecount (true)> 0)
{
Repeated treenodes (xnode. nodes, ref Strout );
}
Strout. append ("</node>/N ");
}
}

Internal void createtree (string strhierarchy, system. Windows. Forms. treenodecollection xtreenodecol)
{
System. xml. xmltextreader XTR = new system. xml. xmltextreader (
New system. Io. stringreader (strhierarchy ));
Int lastdepth =-1;
Int currentdepth =-1;
Enhancedtreenode xnode = NULL;
Treenodecollection xcol = NULL;
XTR. whitespacehandling = whitespacehandling. None;
While (XTR. Read ())
{
If (XTR. nodetype = xmlnodetype. element)
{
Switch (XTR. Name)
{
Case "Node ":
Xnode = new enhancedtreenode ();
Currentdepth = XTR. depth;
XTR. movetoattribute ("ID ");
XTR. readattributevalue ();
Xnode. Itemid = convert. toint32 (XTR. Value, cultureinfo. invariantculture );
XTR. movetoelement ();
XTR. movetoattribute ("inactive ");
XTR. readattributevalue ();
If (lastdepth =-1) // It's the root!
{
Xcol = xtreenodecol;
}
Else if (currentdepth <lastdepth) // move up a node
{
For (INT I = 0; I <lastdepth-currentdepth; I ++)
{
Xcol = xcol [xcol. Count-1]. Parent. Parent. nodes;
}
}
Else if (currentdepth = lastdepth) // stay in the same collection
{
Xcol = xcol;
}
Else if (currentdepth> lastdepth) // move down a node
{
For (INT I = 0; I <currentdepth-lastdepth; I ++)
{
Xcol = xcol [xcol. Count-1]. nodes;
}
}
XTR. movetoelement ();
Lastdepth = XTR. depth;
Break;
Case "name ":
Xnode. itemname = XTR. readstring ();
Xcol. Add (xnode );
Break;
Default:
Break;
}
}
}
XTR. Close ();
}
}

Public sealed class enhancedtreenode: system. Windows. Forms. treenode
{
Private int m_intitemid =-1;
Private string m_stritemname = string. empty;

Public enhancedtreenode ()
{
// Add constructor logic here
}

Public enhancedtreenode (string itemname, int Itemid)
{
M_intitemid = Itemid;
M_stritemname = itemname;
This. Text = itemname;
}

Public int Itemid
{
Get {return m_intitemid ;}
Set {m_intitemid = value ;}
}

Public String itemname
{
Get {return m_stritemname ;}
Set {m_stritemname = value; this. Text = m_stritemname ;}
}
}
}

 

// Read XML

Private void menuitem3_click (Object sender, system. eventargs E)
{
Dialogresult answer = openfiledialog1.showdialog ();
If (answer! = Dialogresult. Cancel)
{
System. Io. textreader TR = system. Io. file. opentext (openfiledialog1.filename );
Treefunctions TF = new treefunctions ();
String hierarchy = tr. readtoend ();
Tr. Close ();
TF. createtree (hierarchy, treeview1.nodes );
}
}

// Exit

Private void menuitem5_click (Object sender, system. eventargs E)
{
Application. Exit ();
}

// Save as an XML file

Private void menuitem4_click (Object sender, system. eventargs E)
{
Dialogresult answer = savefiledialog1.showdialog ();
If (answer! = Dialogresult. Cancel)
{
Treefunctions TF = new treefunctions ();
TF. tree2xml (ref treeview1). Save (savefiledialog1.filename );
}
}