Save to XML from TreeView

Save to XML from TreeView

I have a problem with saving my data from TreeView. I've googled a lot of topics how to save data from TreeView to XML, and I saw i few methods how to make that. But all of them were using WindowsForms application, and nobody - WPF. I tried to convert those examples to WPF, but no one from them do not work correct. Is there any way to make it? One of the ways I tried to port:

    void SaveToXml(TreeView tw)     {         XmlDocument d = new XmlDocument();         XmlNode n = d.CreateNode(XmlNodeType.Element, "root", "");         foreach (TreeViewItem t in tw.Items)         {             n.AppendChild(getXmlNode(t, d));         }         d.AppendChild(n);         d.Save(AppDomain.CurrentDomain.BaseDirectory + "out.xml");     }     private XmlNode getXmlNode(TreeViewItem tnode, XmlDocument d)     {         XmlNode n = d.CreateNode(XmlNodeType.Element, tnode.Name, " ");          foreach (TreeViewItem t in tnode.Items)         {             n.AppendChild(getXmlNode(t, d));         }         return n;     } 

It throws ArgumentException "Local element's and attribute's names cannot be empty". I'm trying to save info about files on my D:\ drive using code:

  private void ListDirectory(TreeView treeView, string path)     {         var rootDirectoryInfo = new DirectoryInfo(path);         treeView.Items.Add(CreateDirectoryNode(rootDirectoryInfo));     }      private static TreeViewItem CreateDirectoryNode(DirectoryInfo directoryInfo)     {         var directoryNode = new TreeViewItem();         directoryNode.Header = directoryInfo.Name;         try         {             foreach (var directory in directoryInfo.GetDirectories())                 directoryNode.Items.Add(CreateDirectoryNode(directory));             foreach (var file in directoryInfo.GetFiles())                 directoryNode.Items.Add(new TreeViewItem { Header = file.Name });         }         catch (UnauthorizedAccessException e)         { }         return directoryNode;     } 

It works fine, and TreeView shows all the folders and files. Please, show me how to save data from TreeView to XML. Thanks.

Tried this:

  public void exportToXml(TreeView tv, string filename)     {         sr = new StreamWriter(filename, false, System.Text.Encoding.UTF8);         //Write the header         sr.WriteLine("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");         //Write our root node         sr.WriteLine("<ROOT>");         foreach (TreeViewItem node in tv.Items)         {             saveNode(node.Items);         }         //Close the root node         sr.WriteLine("</ROOT>");         sr.Close();     }      private void saveNode(TreeViewItem[] tnc)     {         foreach (TreeViewItem node in tnc)         {             //If we have child nodes, we'll write              //a parent node, then iterrate through             //the children             if (node.Items.Count > 0)             {                 sr.WriteLine("<" + node.Name + ">");                 saveNode(node.Items);                 sr.WriteLine("</" + node.Name + ">");             }             else //No child nodes, so we just write the text                 sr.WriteLine(node.Name);         }     } 

But saveNode(node.Items); says that there are different types between node.Items and TreeViewItem[], so I tried List<TreeViewItem>, but error is the same.

Answers & Comments...

Answer: 1

I'm afraid this is not a real answer, but you may try replacing this line :

saveNode(node.Items);  

with this one :

saveNode(node.Items.OfType<TreeViewItem>().ToArray());  

Hope this will help,

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Example of getting an indented string from an xml doc :

public static String ToString(XmlDocument doc) {     StringBuilder sb = new StringBuilder();     XmlTextWriter mywriter = new XmlTextWriter(new StringWriter(sb));     mywriter.Formatting = Formatting.Indented;     doc.WriteTo( mywriter );     mywriter.Flush();     return(sb.ToString()); } 

by : jblhttp://stackoverflow.com/users/1236044

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