ktts https://blog.hatena.ne.jp/ktts/ ktts’s blog https://ktts.hatenablog.com/ C# You could easily make this into an extension methods like this. public static class ExtensionMethods { public static bool AllLeavesChecked(this TreeNode treeNode) { if (treeNode.Nodes.Count == 0) { return treeNode.Checked; } else { bool returns = true; foreach (TreeNode node in treeNode.Nodes) { ret… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Fktts.hatenablog.com%2Fentry%2F2020%2F01%2F30%2F235847" title=".NET C# - How to check if all leaves are in WinForms TreeView. - ktts’s blog" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2020-01-30 23:58:47 rich https://ktts.hatenablog.com/entry/2020/01/30/235847 1.0 100%