C# .NET - C# - Basic use of TreeView Control
Asked By Aldo Liaks on 11-Mar-08 03:09 AM
So far I have opened a Windows Form Project, added to it a TreeView control called "treeView1"
Now I have the namespaces shown below, but when debugging I get the following exception:
Error 1 The name 'treeView1' does not exist in the current context E:\Visual Studio 2008\Projects\Tree\TreeView\TreeView.cs 12 13 TreeView
How can I fix the problem?
Thanks in advance, Aldo.
Class Library called "TreeView":
namespace
TreeView
{
public class TreeView
{
public static void InitializeTreeView(object name)
{
treeView1.BeginUpdate();
treeView1.Nodes.Add(
"Parent");
treeView1.Nodes[0].Nodes.Add(
"Child 1");
treeView1.Nodes[0].Nodes.Add(
"Child 2");
treeView1.Nodes[0].Nodes[1].Nodes.Add(
"Grandchild");
treeView1.Nodes[0].Nodes[1].Nodes[0].Nodes.Add(
"Great Grandchild");
treeView1.EndUpdate();
}
}
}
Windows Form Project called "Tree":
namespace
Tree
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
TreeView.
TreeView.InitializeTreeView();
}
}
}
TreeView Quick Starts
F Cali replied to Aldo Liaks on 10-Mar-08 06:21 PM
You can follow the instructions in the following ASP.NET Quick Starts on TreeView:
http://quickstarts.asp.net/QuickStartv20/aspnet/doc/ctrlref/navigation/treeview.aspx
tutorial
Shallu Gupta replied to Aldo Liaks on 10-Mar-08 06:21 PM
go thru this tutorial to know how to work on treeview
http://www.c-sharpcorner.com/UploadFile/scottlysle/TreeviewBasics04152007195731PM/TreeviewBasics.aspx
type treeview in the search box to the left
Robbe Morris replied to Aldo Liaks on 10-Mar-08 07:38 PM
to find articles on eggheadcafe.
How to fix the problem
Aldo Liaks replied to Robbe Morris on 11-Mar-08 03:12 AM
So far I have opened a Windows Form Project, added to it a TreeView control called "treeView1"
Now I have the namespaces shown below, but when debugging I get the following exception:
Error 1 The name 'treeView1' does not exist in the current context E:\Visual Studio 2008\Projects\Tree\TreeView\TreeView.cs 12 13 TreeView
How can I fix the problem?
Thanks in advance, Aldo.
Class Library called "TreeView":
namespace
TreeView
{
public class TreeView
{
public static void InitializeTreeView(object name)
{
treeView1.BeginUpdate();
treeView1.Nodes.Add(
"Parent");
treeView1.Nodes[0].Nodes.Add(
"Child 1");
treeView1.Nodes[0].Nodes.Add(
"Child 2");
treeView1.Nodes[0].Nodes[1].Nodes.Add(
"Grandchild");
treeView1.Nodes[0].Nodes[1].Nodes[0].Nodes.Add(
"Great Grandchild");
treeView1.EndUpdate();
}
}
}
Windows Form Project called "Tree":
namespace
Tree
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
TreeView.
TreeView.InitializeTreeView();
}
}
}
can u change the application name from treeview to another and check...
Santhosh N replied to Aldo Liaks on 11-Mar-08 05:39 AM
might be the problem with app name creating ambiguity with the class name or else try to paste entire form code here...
Aldo Liaks replied to Santhosh N on 11-Mar-08 07:02 AM
I tried changing application names but it doesn't compile.
I also change the name of the TreeView control to myTree
I am pretty sure the problem is in the way I am trying to pass the name of the TreeView control to the method in the Class Library...
See the orange...
Thanks in advance for any help,
Aldo.
Below the code in Class Library Proj
Code Snippet
namespace
TreeViewProj
{
public class TreeViewClass
{
public static void InitializeTreeView2(object TreeName)
{
TreeName.BeginUpdate();
TreeName.Nodes.Add(
"Zeide Bernardo");
TreeName.Nodes[0].Nodes.Add("Anita");
TreeName.Nodes[0].Nodes[0].Nodes.Add("Sharon");
TreeName.Nodes[0].Nodes.Add("Benito");
TreeName.Nodes[0].Nodes[1].Nodes.Add("Aldo");
TreeName.Nodes[0].Nodes[1].Nodes[0].Nodes.Add("Kevin");
TreeName.EndUpdate();
}
}
}
Below the code for the Window Form:
Code Snippet
namespace
Tree
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
TreeViewClass.InitializeTreeView2(this.myTree);
}
}
}
Santhosh N replied to Aldo Liaks on 11-Mar-08 08:03 AM
Can u type cast the object type to treeview in
public static void InitializeTreeView2(object TreeName)
before doing all the stuff....and check
treeview1 is never declared
Robbe Morris replied to Aldo Liaks on 11-Mar-08 08:05 AM
where is the following line in your code? I don't see it.
TreeView treeview1 = new TreeView();
Declaration
Aldo Liaks replied to Robbe Morris on 11-Mar-08 09:01 AM
You were right, it was about declaring the type.
What I did is:
.- In Class Library "TreeViewProj" I Added a reference to System.Windows.Forms
Then I was able to change the method as follows
Thanks again
Aldo.
using System.Windows.Forms;
namespace TreeViewProj
{
public class TreeViewClass
{
public static void InitializeTreeView2(TreeView TreeName)
{
TreeName.BeginUpdate();
TreeName.Nodes.Add("Zeide Bernardo");
TreeName.Nodes[0].Nodes.Add("Anita");
TreeName.Nodes[0].Nodes[0].Nodes.Add("Sharon");
TreeName.Nodes[0].Nodes.Add("Benito");
TreeName.Nodes[0].Nodes[1].Nodes.Add("Aldo");
TreeName.Nodes[0].Nodes[1].Nodes[0].Nodes.Add("Kevin");
TreeName.EndUpdate();
}
}
}
Below the code for the Window Form:
Code Snippet
namespace Tree
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
TreeViewClass.InitializeTreeView2(this.myTree);
}
}
}
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