how to make perticular node enabled false in treeview dynamically

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i have treeview which is loaded from database dynamically with checkbox. when this treeview loaded i want to disable some nodes of this treeview .i.e when user click on these perticular node there is no action perform with this checkbox ....what can i do? which property use?
following is my code:

private void LoadTreeview()
{
//KpiBAL objkpibal = new KpiBAL();
DataSet ds = new DataSet();
ds = balkeyrole.GetTreeviewData(Globalclass.Activedatabase.ToString());
foreach (DataRow dr in ds.Tables["Department"].Rows)
{
TreeNode tn = new TreeNode(dr["DeptName"].ToString());
tn.Tag = dr["DeptID"];
foreach (DataRow drChild in dr.GetChildRows("Dept_sub"))
{
TreeNode tnChild = tn.Nodes.Add(drChild["SubDeptName"].ToString());
tnChild.Tag = drChild["SubDeptId"];

foreach (DataRow dr1 in ds.Tables["SubDepartment"].Rows)
{
foreach (DataRow drChild1 in dr1.GetChildRows("Sub_KPI"))
{
if (drChild["SubDeptId"].ToString() == drChild1["SubDeptId"].ToString())
{
TreeNode kpi = tnChild.Nodes.Add(drChild1["KPIName"].ToString());
kpi.Tag = drChild1["KPIID"];
DataTable Dt = new DataTable();
Dt = balkeyrole.GetKPIID(Globalclass.Activedatabase);
foreach (DataRow dr2 in Dt.Rows )
{
if (dr2["KPIID"].ToString() == kpi.Tag.ToString())
{
//treeViewRoleAssignmentKPI.SelectedNode = kpi;
//ReadOnlyNodeTrue();

treeViewRoleAssignmentKPI.SelectedNode = kpi;
kpi.Checked = true; //this code i will try for disable but cant work
kpi.EndEdit(false);
// kpi.EnsureVisible();
// kpi.EndEdit(false);
//ReadOnlyNodeTrue(kpi);
// treeViewRoleAssignmentKPI.CheckBoxes=true;
//HideCheckBox(ref kpi);
}
}
}
}
}
}
treeViewRoleAssignmentKPI.Nodes.Add(tn);
treeViewRoleAssignmentKPI.SelectedNode = treeViewRoleAssignmentKPI.TopNode;
colorTreeViewNodes(treeViewRoleAssignmentKPI.Nodes);
}
}

Posted 16-Feb-14 23:09pm

Gauri Bharde

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Dinesh.V.Kumar 17-Feb-14 5:12am

try ..kpi.Enabled=false...

Regards,

2 solutions

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johannesnestler · Accepted Answer · 2014-02-17T03:49:00

Solution 1

Maybe this helps:
http://forums.asp.net/t/1245057.aspx?How+to+create+a+flipcart+like+panel+for+showing+products+in+gridview

Posted 17-Feb-14 3:49am

johannesnestler

BillWoodruff · Accepted Answer · 2014-02-17T08:00:00

... edit #1 ...

With a quick search I found this Win API code for disabling CheckBoxes in a TreeView: [^].

This would require you to sub-class the Microsoft TreeView, something I tried in the past and was not happy with the results of for various reasons.

... end edit #1 ...

Assuming this is a Windows Forms TreeView: there is some good news; you can prevent CheckBox activation from "casual clicking" by doing the following:

C#

// a List to hold TreeNodes with CheckBox disabled
List<TreeNode> DisabledCheckNodes = new List<TreeNode>();

// method to disable CheckBox use in specific TreeNodes
private void SetDisabledCheckNodes(params TreeNode[] theNodes)
{
    DisabledCheckNodes.AddRange(theNodes);
}

// method to re-enable CheckBox use in specific TreeNodes
private void EnableCheckNodes(params TreeNode[] theNodes)
{
    foreach (var theNode in theNodes)
    {
        if (DisabledCheckNodes.Contains(theNode)) DisabledCheckNodes.Remove(theNode);
    }
}

// a flag to control possible recursion in changing
// TreeNode CheckState in a 'CheckChanged EventHandler
private bool dontRecurse = false;

// function to use to try and prevent CheckBox use
private bool StopCheckBoxUse(TreeNode theNode)
{
    if (DisabledCheckNodes.Contains(theNode))
    {
        dontRecurse = true;
        theNode.Checked = false;
        treeView1.Update();
        dontRecurse = false;
        return true;
    }
    else
    {
        return false;
    }
}

// the EventHandlers for the TreeView
private void treeView1_BeforeCheck(object sender, TreeViewCancelEventArgs e)
{
    if (dontRecurse) return;

    e.Cancel = StopCheckBoxUse(e.Node);
}

private void treeView1_AfterCheck(object sender, TreeViewEventArgs e)
{
    if (dontRecurse) return;

    StopCheckBoxUse(e.Node);
}

To set which Nodes have disabled CheckBoxes:

C#

SetDisabledCheckNodes(treeView1.Nodes[2],treeView1.Nodes[4],treeView1.Nodes[6]);

To re-enable CheckBoxes on a TreeNode:

EnableCheckNodes(treeView1.Nodes[6]);

And now, the bad news; the user, if determined, can get the CheckBox Checked, or unchecked by quickly repeated clicking on the CheckBox.

I experimented (long ago) with defining every TreeView Event that could possibly affect the CheckBox state, all MouseClicks, MouseDowns, After-Before Select, etc., and set the CheckBox to unchecked in them, without success. I have concluded that this phenomenon is yet another quirk of the Win Form TreeView (another reason, among many, I switched to using the commercial Lidor Systems IntegralUI TreeView).

However, this code was done several years ago, and I have not researched, recently, to see if there is any other "fix" available for making disabling the CheckBoxes "stick" under all conditions for the WinForm TreeView.