Operation on Treeview with checkbox

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Posted 20-Jan-16 1:35am

Member 10950038

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Richard Deeming 20-Jan-16 8:22am

You need to tell us which of the hundreds of "treeview" classes you're using.

Member 10950038 20-Jan-16 8:33am

Hello,
Thanks for being there, I need help for TreeView control in C# 3.5 .

Richard Deeming 20-Jan-16 8:36am

Yes, but WHICH of the hundreds of classes called "TreeView" are you using?

There's one built-in for ASP.NET WebForms; there's one built-in for Windows Forms; there's one built-in for WPF; and there are hundreds of third-party controls.

The code you use will vary depending on which control you're using.

If you don't tell us which control you're using, we can't tell you how to solve the problem.

Member 10950038 20-Jan-16 9:03am

Oh sorry,
I need code for winform application in C# 3.5 .net framework.

Sergey Alexandrovich Kryukov 20-Jan-16 12:08pm

Do you mean System.Windows.Forms.TreeView?
If so, this is exactly what you had to specify, nothing else. It's the full type name.
"Winform application", strictly speaking, still does not specify what exactly you use.
—SA

Member 10950038 21-Jan-16 1:36am

Yes, I mean
System.windows.Forms.TreeView
And I also tryed for all the possible option.
Please give me right way as my problem given you above.

Sergey Alexandrovich Kryukov 21-Jan-16 1:43am

I gave you exact and comprehensive answer for this class, Solution 1. You talk as if you did not realize that.

Did you read it? Are you going to accept this answer formally?
In all cases, your follow-up questions will be welcome.

—SA

Sergey Alexandrovich Kryukov 20-Jan-16 12:30pm

Anyway, I answered for System.Windows.Forms.TreeView. Please see Solution 1.
—SA

Sergey Alexandrovich Kryukov 20-Jan-16 12:06pm

Richard, you are perfectly right. We really need to know this type. I'm just curious: do you really know hundreds of such types (usable through C#) or it's just a figure of speech, a hyperbola? :-)
—SA

Richard Deeming 20-Jan-16 12:08pm

Just a figure of speech. But it wouldn't surprise me if there really were 100+ distinct "TreeView" types available. :)

Sergey Alexandrovich Kryukov 20-Jan-16 12:09pm

Right... :-)
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2016-01-20T06:26:00

Please see our comments to the question. Most likely, you mean System.Windows.Forms.TreeView.

If so, you can capture the event of changing checked state of your parent node by handling one of both of these events:
TreeView.AfterCheck Event (System.Windows.Forms)[^],
TreeView.BeforeCheck Event (System.Windows.Forms)[^].

The check of other nodes is performed using the property System.Windows.Forms.TreeNode.Checked:
TreeNode.Checked Property (System.Windows.Forms)[^].

You will need the node which is about to change or changed its check state. The reference to this node will be passed to your event handler via the event arguments parameter:
TreeViewEventArgs Class (System.Windows.Forms)[^],
TreeViewEventArgs.Node Property (System.Windows.Forms)[^].

You should be extra careful here, to avoid infinite recursion. When you programmatically change the checked state in your event handler, it will eventually call the same event handler. So, you need different action on the change of this state as an immediate result of the user click and as a result of your programmatic change.

Again, look at this page I already referenced above: TreeView.AfterCheck Event (System.Windows.Forms)[^].

See the "Remark" section which warns you about this situation. See also the code sample; pay attention for the comment "The code only executes if the user caused the checked state to change". In your code, you should also take care of that.

—SA