如何在 Treeview 控件中使子节点可见 = false [英] How to make a child node visible = false in a Treeview Control

问题描述

我有一个带有树视图控件的 Windows 窗体.这个树视图有一个根节点和 2 个子节点.我的要求是我需要隐藏第一个子节点.是否有可能使特定孩子点头可见是错误的

I'm having a windows form with a tree view control. This tree view has a Root node and 2 child nodes. My requirement is i need to hide the first child node. Is it possible to make visible false that particular child nod

推荐答案

是的，您可以从树节点继承并创建自己的行为.像这样.

Yes you could inherit from tree node and create your own behaviour. Like so.

public class RootNode : TreeNode
{
    public List<ChildNode> ChildNodes { get; set; }

    public RootNode()
    {
        ChildNodes = new List<ChildNode>();
    }

    public void PopulateChildren()
    {
        this.Nodes.Clear();

        var visibleNodes = 
            ChildNodes
            .Where(x => x.Visible)
            .ToArray();

        this.Nodes.AddRange(visibleNodes);
    }

    //you would use this instead of (Nodes.Add)
    public void AddNode(ChildNode node)
    {
        if (!ChildNodes.Contains(node))
        {
            node.ParentNode = this;
            ChildNodes.Add(node);
            PopulateChildren();
        }
    }

    //you would use this instead of (Nodes.Remove)
    public void RemoveNode(ChildNode node)
    {
        if (ChildNodes.Contains(node))
        {
            node.ParentNode = null;
            ChildNodes.Remove(node);
            PopulateChildren();
        }

    }
}

public class ChildNode : TreeNode
{
    public RootNode ParentNode { get; set; }
    private bool visible;
    public bool Visible { get { return visible; } set { visible = value;OnVisibleChanged(): } }
    private void OnVisibleChanged()
    {
        if (ParentNode != null)
        {
            ParentNode.PopulateChildren();
        }
    }
}

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