C# 如何遍历 treeView 控件的所有节点。C＃
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How to Iterate through all nodes of a treeView Control. C#
提问by Jean
I am selecting all controls I have in a form
我正在选择我拥有的所有控件 form
if controls are Treeviews, I'll iterate all nodes they have
如果控件是Treeviews，我将迭代它们拥有的所有节点
I need something like: (And it is my code)
我需要类似的东西：（这是我的代码）
foreach (Control c in PanelSM.Controls)
{
if (c is TreeView)
{
TreeNodeCollection myNodes = c.Nodes;//<<<<< Here is a mistake
foreach (TreeNode n in myNodes)
{
String text = rm.GetString(n.Name);
//And more things
//...
//...
//...
}
}
//...
}
Any idea?
任何的想法？
Thank You
谢谢你
采纳答案by Darren Kopp
Your mistake is that cis actually a variable of type Control, which does not have a Nodesmember. You will need it to cast it as a TreeViewtype.
你的错误是它c实际上是一个 type 变量Control，它没有Nodes成员。您将需要它来将其转换为TreeView类型。
You can do either of these two approaches:
您可以执行以下两种方法之一：
if (c is TreeView)
{
TreeNodeCollection myNodes = ((TreeView) c).Nodes; // <<--- Note the cast
...
}
or
或者
TreeView tv = c as TreeView;
if (tv != null)
{
TreeNodeCollection myNodes = tv.Nodes;
...
}
回答by Darren Kopp
You need to use recursion. A method like this should suffice
您需要使用递归。这样的方法应该就足够了
IEnumerable<TreeNode> Collect(TreeNodeCollection nodes)
{
foreach(TreeNode node in nodes)
{
yield return node;
foreach (var child in Collect(node.Nodes))
yield return child;
}
}
Then in your method you can just do
然后在你的方法中你可以做
foreach (var node in Collect(tree.Nodes))
{
// you will see every child node here
}
回答by Jim Mischel
It's pretty easy:
这很容易：
void TraverseTree(TreeNodeCollection nodes)
{
foreach (var child in nodes)
{
DoSomethingWithNode(child);
TraverseTree(child.Nodes);
}
}
And call it with:
并调用它：
TraverseTree(MyTreeView.Nodes);
回答by user3217996
try this
尝试这个
foreach (TreeNode t in tvMenu.Nodes)
{
for (int iParent = 0; iParent < t.ChildNodes.Count; iParent++)
{
for (int iChild = 0; iChild < t.ChildNodes[iParent].ChildNodes.Count; iChild++)
{
if (t.ChildNodes[iParent].ChildNodes[iChild].Text == "")
{
}
}
}
}
回答by Plasmabubble
Building on top of Darren's great answer, you can combine recursion and class extension.
在 Darren 的出色答案的基础上，您可以结合使用recursion 和 class extension。
Declare somewhere in your namespace :
在命名空间中的某处声明：
public static class MyExtensions
{
public static IEnumerable<TreeNode> All( this TreeNodeCollection nodes )
{
foreach( TreeNode n in nodes )
{
yield return n;
foreach( TreeNode child in n.Nodes.All( ) )
yield return child;
}
}
}
Note the "this" before the first argument of the method.
注意方法的第一个参数之前的“this”。
Then you can use this new method in all treeviews as:
然后你可以在所有树视图中使用这个新方法：
foreach( TreeNode n in myTreeview.Nodes.All() ) ...
回答by Bob Oberst
I prefer simplicity, and here is my simple solution:
我更喜欢简单，这是我的简单解决方案：
protected void TraverseNodes(TreeNodeCollection nodes, string action, int maxDepth = 2)
{
foreach (TreeNode node in nodes)
{
if (node.ChildNodes.Count > 0 && node.Depth < maxDepth)
TraverseNodes(node.ChildNodes, action, maxDepth);
//do something!!!
var x = node.Text;
node.Checked = !node.Checked;
}
}
I decided to include a "maximum depth" as a bonus, so enjoy.
我决定包括一个“最大深度”作为奖励，所以享受吧。
Call it as follows:
调用如下：
TraverseNodes(this.Activities.Nodes, "");
Unlike some of the examples posted here, I actually tested this (ouch! I can hear them say).
与此处发布的一些示例不同，我实际上对此进行了测试（哎哟！我可以听到他们说）。
