SelectedNode is not working after refresh always showing null
0
Here i am trying to show the last selected node after reload of treeview but the selected node is always null. I am able to find the tree node from the treeview node collection but not able to assign it to tree view. Please suggeest:
public void LoadTreeViewData()
treeView.Nodes.Clear();// Clear any existing items
treeView.BeginUpdate(); // prevent overhead and flicker
LoadBaseNodes();//Populate all nodes
treeView.EndUpdate();
treeView.Refresh();
treeView.ExpandAll();
if (!string.IsNullOrEmpty(m_oSelectedNode_NAME))
TreeNode treeNodes = treeView.FlattenTree()
.Cast<TreeNode>()
.Where(r => Convert.ToDecimal(r.Tag) == Convert.ToDecimal(m_oSelectedNode_NAME))
.ToArray();
treeView.SelectedNode = treeNodes[0];
treeView.Focus();
c# winforms treeview
asked Nov 14 '18 at 20:17
DeltaDelta
1146
|
show 10 more comments
0
Here i am trying to show the last selected node after reload of treeview but the selected node is always null. I am able to find the tree node from the treeview node collection but not able to assign it to tree view. Please suggeest:
public void LoadTreeViewData()
treeView.Nodes.Clear();// Clear any existing items
treeView.BeginUpdate(); // prevent overhead and flicker
LoadBaseNodes();//Populate all nodes
treeView.EndUpdate();
treeView.Refresh();
treeView.ExpandAll();
if (!string.IsNullOrEmpty(m_oSelectedNode_NAME))
TreeNode treeNodes = treeView.FlattenTree()
.Cast<TreeNode>()
.Where(r => Convert.ToDecimal(r.Tag) == Convert.ToDecimal(m_oSelectedNode_NAME))
.ToArray();
treeView.SelectedNode = treeNodes[0];
treeView.Focus();
c# winforms treeview
asked Nov 14 '18 at 20:17
DeltaDelta
1146
It would be awesome if you could provide a Minimal, Complete, and Verifiable example.
– mjwills
Nov 14 '18 at 20:32
WinForms? ASP? I can figure out what FlattenTree is doing, but it's not a standard function in the WinForm's TreeView control. Wouldn't it just betreeView.SelectedNode = tns[0];Not sure why you are doing all that other stuff.
– LarsTech
Nov 14 '18 at 20:34
Here flatten tree is nothing but returning IEnumerable<TreeNode> collection to find me last save node.Its a winform control.
– Delta
Nov 14 '18 at 21:03
Here problem is although i found the tree node but when i assign to selectedNode . SelectedNode stays null.
– Delta
Nov 14 '18 at 21:07
Yes . It is decimal and its returning me the tree node but while assigning the selected node is null.
– Delta
Nov 14 '18 at 21:11
|
show 10 more comments
0
0
0
Here i am trying to show the last selected node after reload of treeview but the selected node is always null. I am able to find the tree node from the treeview node collection but not able to assign it to tree view. Please suggeest:
public void LoadTreeViewData()
treeView.Nodes.Clear();// Clear any existing items
treeView.BeginUpdate(); // prevent overhead and flicker
LoadBaseNodes();//Populate all nodes
treeView.EndUpdate();
treeView.Refresh();
treeView.ExpandAll();
if (!string.IsNullOrEmpty(m_oSelectedNode_NAME))
TreeNode treeNodes = treeView.FlattenTree()
.Cast<TreeNode>()
.Where(r => Convert.ToDecimal(r.Tag) == Convert.ToDecimal(m_oSelectedNode_NAME))
.ToArray();
treeView.SelectedNode = treeNodes[0];
treeView.Focus();
c# winforms treeview
asked Nov 14 '18 at 20:17
DeltaDelta
1146
Here i am trying to show the last selected node after reload of treeview but the selected node is always null. I am able to find the tree node from the treeview node collection but not able to assign it to tree view. Please suggeest:
public void LoadTreeViewData()
treeView.Nodes.Clear();// Clear any existing items
treeView.BeginUpdate(); // prevent overhead and flicker
LoadBaseNodes();//Populate all nodes
treeView.EndUpdate();
treeView.Refresh();
treeView.ExpandAll();
if (!string.IsNullOrEmpty(m_oSelectedNode_NAME))
TreeNode treeNodes = treeView.FlattenTree()
.Cast<TreeNode>()
.Where(r => Convert.ToDecimal(r.Tag) == Convert.ToDecimal(m_oSelectedNode_NAME))
.ToArray();
treeView.SelectedNode = treeNodes[0];
treeView.Focus();
c# winforms treeview
c# winforms treeview
asked Nov 14 '18 at 20:17
DeltaDelta
1146
asked Nov 14 '18 at 20:17
DeltaDelta
1146
edited Nov 14 '18 at 21:05
Delta
asked Nov 14 '18 at 20:17
DeltaDelta
1146
asked Nov 14 '18 at 20:17
DeltaDelta
1146
asked Nov 14 '18 at 20:17
DeltaDelta
1146
1146
It would be awesome if you could provide a Minimal, Complete, and Verifiable example.
– mjwills
Nov 14 '18 at 20:32
WinForms? ASP? I can figure out what FlattenTree is doing, but it's not a standard function in the WinForm's TreeView control. Wouldn't it just betreeView.SelectedNode = tns[0];Not sure why you are doing all that other stuff.
– LarsTech
Nov 14 '18 at 20:34
Here flatten tree is nothing but returning IEnumerable<TreeNode> collection to find me last save node.Its a winform control.
– Delta
Nov 14 '18 at 21:03
Here problem is although i found the tree node but when i assign to selectedNode . SelectedNode stays null.
– Delta
Nov 14 '18 at 21:07
Yes . It is decimal and its returning me the tree node but while assigning the selected node is null.
– Delta
Nov 14 '18 at 21:11
|
show 10 more comments
It would be awesome if you could provide a Minimal, Complete, and Verifiable example.
– mjwills
Nov 14 '18 at 20:32
WinForms? ASP? I can figure out what FlattenTree is doing, but it's not a standard function in the WinForm's TreeView control. Wouldn't it just betreeView.SelectedNode = tns[0];Not sure why you are doing all that other stuff.
– LarsTech
Nov 14 '18 at 20:34
Here flatten tree is nothing but returning IEnumerable<TreeNode> collection to find me last save node.Its a winform control.
– Delta
Nov 14 '18 at 21:03
Here problem is although i found the tree node but when i assign to selectedNode . SelectedNode stays null.
– Delta
Nov 14 '18 at 21:07
Yes . It is decimal and its returning me the tree node but while assigning the selected node is null.
– Delta
Nov 14 '18 at 21:11
It would be awesome if you could provide a Minimal, Complete, and Verifiable example.
– mjwills
Nov 14 '18 at 20:32
It would be awesome if you could provide a Minimal, Complete, and Verifiable example.
– mjwills
Nov 14 '18 at 20:32
WinForms? ASP? I can figure out what FlattenTree is doing, but it's not a standard function in the WinForm's TreeView control. Wouldn't it just be
treeView.SelectedNode = tns[0]; Not sure why you are doing all that other stuff.– LarsTech
Nov 14 '18 at 20:34
WinForms? ASP? I can figure out what FlattenTree is doing, but it's not a standard function in the WinForm's TreeView control. Wouldn't it just be
treeView.SelectedNode = tns[0]; Not sure why you are doing all that other stuff.– LarsTech
Nov 14 '18 at 20:34
Here flatten tree is nothing but returning IEnumerable<TreeNode> collection to find me last save node.Its a winform control.
– Delta
Nov 14 '18 at 21:03
Here flatten tree is nothing but returning IEnumerable<TreeNode> collection to find me last save node.Its a winform control.
– Delta
Nov 14 '18 at 21:03
Here problem is although i found the tree node but when i assign to selectedNode . SelectedNode stays null.
– Delta
Nov 14 '18 at 21:07
Here problem is although i found the tree node but when i assign to selectedNode . SelectedNode stays null.
– Delta
Nov 14 '18 at 21:07
Yes . It is decimal and its returning me the tree node but while assigning the selected node is null.
– Delta
Nov 14 '18 at 21:11
Yes . It is decimal and its returning me the tree node but while assigning the selected node is null.
– Delta
Nov 14 '18 at 21:11
|
show 10 more comments
1 Answer
1
active
oldest
votes
0
This problem is happening because i am trying to Update the selected node inside the Tree view after label edit event. I put a timer inside After label edit to resolve the issue and set the Selected node it works for me.
var tnm = new Timer() Enabled = true, Interval = 30 ;
tnm.Tick += delegate
SetSelectioNode();
tnm.Dispose();
;
answered Nov 16 '18 at 14:41
DeltaDelta
1146
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
active
oldest
votes
0
This problem is happening because i am trying to Update the selected node inside the Tree view after label edit event. I put a timer inside After label edit to resolve the issue and set the Selected node it works for me.
var tnm = new Timer() Enabled = true, Interval = 30 ;
tnm.Tick += delegate
SetSelectioNode();
tnm.Dispose();
;
answered Nov 16 '18 at 14:41
DeltaDelta
1146
add a comment |
0
This problem is happening because i am trying to Update the selected node inside the Tree view after label edit event. I put a timer inside After label edit to resolve the issue and set the Selected node it works for me.
var tnm = new Timer() Enabled = true, Interval = 30 ;
tnm.Tick += delegate
SetSelectioNode();
tnm.Dispose();
;
answered Nov 16 '18 at 14:41
DeltaDelta
1146
add a comment |
0
0
0
This problem is happening because i am trying to Update the selected node inside the Tree view after label edit event. I put a timer inside After label edit to resolve the issue and set the Selected node it works for me.
var tnm = new Timer() Enabled = true, Interval = 30 ;
tnm.Tick += delegate
SetSelectioNode();
tnm.Dispose();
;
answered Nov 16 '18 at 14:41
DeltaDelta
1146
This problem is happening because i am trying to Update the selected node inside the Tree view after label edit event. I put a timer inside After label edit to resolve the issue and set the Selected node it works for me.
var tnm = new Timer() Enabled = true, Interval = 30 ;
tnm.Tick += delegate
SetSelectioNode();
tnm.Dispose();
;
answered Nov 16 '18 at 14:41
DeltaDelta
1146
answered Nov 16 '18 at 14:41
DeltaDelta
1146
answered Nov 16 '18 at 14:41
DeltaDelta
1146
answered Nov 16 '18 at 14:41
DeltaDelta
1146
1146
add a comment |
add a comment |
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It would be awesome if you could provide a Minimal, Complete, and Verifiable example.
– mjwills
Nov 14 '18 at 20:32
WinForms? ASP? I can figure out what FlattenTree is doing, but it's not a standard function in the WinForm's TreeView control. Wouldn't it just be
treeView.SelectedNode = tns[0];Not sure why you are doing all that other stuff.– LarsTech
Nov 14 '18 at 20:34
Here flatten tree is nothing but returning IEnumerable<TreeNode> collection to find me last save node.Its a winform control.
– Delta
Nov 14 '18 at 21:03
Here problem is although i found the tree node but when i assign to selectedNode . SelectedNode stays null.
– Delta
Nov 14 '18 at 21:07
Yes . It is decimal and its returning me the tree node but while assigning the selected node is null.
– Delta
Nov 14 '18 at 21:11