[C#]TreeView单选模式的实现

Posted 2022-11-24 Thomas会写字

一、需求

使TreeView实现单选模式

二、实现

1、TreeView控件属性CheckBoxes设置为True

2、为TreeView添加AfterCheck事件，并在事件中调用如下方法

/// <summary>
/// 树形框-单选模式的实现,放在事件 _AfterCheck下
/// </summary>
/// <param name="tv"></param>
/// <param name="e"></param>
public static void TreeViewSingleSelectedAndChecked(TreeView tv, TreeViewEventArgs e)

    if (e.Action == TreeViewAction.ByMouse)
    
        if (e.Node.Checked)
        
            tv.SelectedNode = e.Node;
            CancelCheckedExceptOne(tv.Nodes, e.Node);
        
    


private static void CancelCheckedExceptOne(TreeNodeCollection tnc,TreeNode tn)

    foreach (TreeNode item in tnc)
    
        if (item != tn)
            item.Checked = false;
        if (item.Nodes.Count > 0)
            CancelCheckedExceptOne(item.Nodes, tn);
    

三、示例

private void treeView_1_AfterCheck(object sender, TreeViewEventArgs e)

    TreeViewSingleSelectedAndChecked(treeView_1, e);