过滤后保留选定的treenodes

• Z时代
• 2024-01-10
• 分类：问答

过滤树状图后保留选定的treenodes 我过滤树状视图。当检查节点时，我想保留已过滤的树视图中的已检查节点。当我删除过滤器时，仍然必须检查节点。 我做错了什么，过滤器工作，但我松了检查。过滤后保留选定的treenodes

List<string> ListCheckboxItems = new List<string>(); //create a list from the checkedlistbox itmes 
List<string> KeepSelectedItems = new List<string>(); //Create a list with the selected items 
     private void textBox1_TextChanged(object sender, EventArgs e) //new 24-12-2017 
     { 
      var filteredItems = ListCheckboxItems.Where(item => item.Contains(textBox1.Text)); 
      List<string> FilterList = filteredItems.ToList(); 
      treeViewFilter.Nodes.Clear();   //remove all nodes 
      foreach (object item in FilterList)  //Fill it again with only the filtered items 
      { 
       treeViewFilter.Nodes.Add(item.ToString()); //new 24-12-2017 
      } 
      foreach (string keepitem in KeepSelectedItems) //Keep the items checked when filter starts 
      { 
       TreeNode[] arr = treeViewFilter.Nodes.Find(keepitem, true); 
       foreach (TreeNode s in arr) 
       { 
        treeViewFilter.SelectedNode = s; 
        s.Checked = true; 
       } 
      } 
      //check if empty the put the original list back 
      if (textBox1.Text == string.Empty) //park the checked items 
      { 
       foreach (string item in KeepSelectedItems) 
       { 
        TreeNode[] arr = treeViewFilter.Nodes.Find(item, true); 
        foreach (TreeNode s in arr) 
        { 
         treeViewFilter.SelectedNode = s; 
         s.Checked = true; 
        } 
       } 
      } 
     } 

回答：

private void textBox1_TextChanged(object sender, EventArgs e) //new 24-12-2017 
     { 
      var filteredItems = ListTreeViewItems.Where(item => item.Contains(textBox1.Text)); 
      List<string> FilterList = filteredItems.ToList(); 
      treeViewFilter.Nodes.Clear();   //remove all nodes 
      foreach (object item in FilterList)  //Fill it again with only the filtered items 
      { 
       TreeNode aNode = new TreeNode(item.ToString()) { Name = item.ToString() }; //THIS LINE IS THE SOLUTION 
       treeViewFilter.Nodes.Add(aNode); 
      } 
      //zet de vinkjes weer terug 
      foreach (string keepitem in KeepSelectedItems) //Keep the items checked when filter starts 
      { 
       TreeNode[] arr = treeViewFilter.Nodes.Find(keepitem, true); 
       Logging.WriteToLog("", "treeViewFilter.Nodes.Find(keepitem, true); " + treeViewFilter.Nodes.Find(keepitem, true)); 
       // Logging.WriteToLog("", "test " + test); 
       foreach (TreeNode s in arr) 
       { 
        treeViewFilter.SelectedNode = s; 
        s.Checked = true; 
       } 
      } 
      //check if empty the put the original list back 
      if (textBox1.Text == string.Empty) //park the checked items 
      { 
       foreach (string item in KeepSelectedItems) 
       { 
        TreeNode[] arr = treeViewFilter.Nodes.Find(item, true); 
        foreach (TreeNode s in arr) 
        { 
         treeViewFilter.SelectedNode = s; 
         s.Checked = true; 
        } 
       } 
      } 
     } 

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