C# xmldataprovider插入节点

Question

我正在尝试为xml配置文件编写一个编辑器。我将xml文件绑定到一个列表视图，然后选择一个元素，然后单击edit就可以编辑一个元素。当用户单击“保存”时，将调用一个委托来更新xml文档中的元素。我尝试过用不同的方法进行更新，包括appendnode、prependnode、insertafter和替换子节点。我让它们都正常工作，没有任何编译时或运行时错误，但它们不更新xmldataprovider或listview。这可能只是我遗漏了一些简单的东西，但我很难弄清楚它是什么。有人能帮帮忙吗？

谢谢，布赖恩

如果有帮助，下面是我的主窗体(带有listview的窗体)的源代码。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Xml;
using System.IO;

namespace g2config
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>

    public partial class MainWindow : Window
    {
        public XmlDataProvider dp;
        string cfgfile;
        public managecmpnts manage_components;
        public delegate void managecmpnts(int id, XmlElement component);


        public MainWindow()
        {
            InitializeComponent();
            dp = this.FindResource("configfile") as XmlDataProvider;

            cfgfile = "C:\\Users\\briansvgs\\Desktop\\g2config\\g2config\\bin\\Debug\\g2config.pxml";

            if(Environment.GetCommandLineArgs().Count() > 1)
            {
                string path = Environment.GetCommandLineArgs().ElementAt(1);
                //MessageBox.Show("Path: " + path);
                cfgfile = path;
            }

            if (File.Exists(cfgfile))
            {
                dp.Source = new Uri(cfgfile, UriKind.RelativeOrAbsolute);
            }
            else
            {
                MessageBox.Show("config file not found");
            }

            this.Title = this.Title + " (" + cfgfile + ") ";
        }

        public void browsedir( object sender, EventArgs e)
        {
              System.Windows.Forms.OpenFileDialog ofd = new System.Windows.Forms.OpenFileDialog();
            ofd.Filter = "PXML Files (*.pxml)|*.pxml"; ;

            //http://www.kirupa.com/net/using_open_file_dialog_pg4.htm
            if (ofd.ShowDialog() == System.Windows.Forms.DialogResult.OK) //how to browse dirs instead of files?????
            {
                 startpath.Text = ofd.FileName;
            }
        }

        public void newcomponent(object sender, RoutedEventArgs e)
        {            
            componentsettings new_cmpnt = new componentsettings();
            new_cmpnt.Title = "Add Component";
            new_cmpnt.ShowDialog();         
        }

        public void editcomponent(object sender, RoutedEventArgs e)
        {
            int selected = components.SelectedIndex;
            XmlElement current = (XmlElement)components.Items.CurrentItem;
            componentsettings edit_cmpnt = new componentsettings(current);
            edit_cmpnt.cmpnt_mgr.manage_components += new manager.mngcmpnts(test);
            edit_cmpnt.Title = "Edit Component";
            edit_cmpnt.ShowDialog();
        }

        private void browsedir(object sender, RoutedEventArgs e)
        {
            System.Windows.Forms.FolderBrowserDialog directory;
            directory = new System.Windows.Forms.FolderBrowserDialog();
            directory.Description = "Please select the folder containing your g2 configuration (pxml) files. Default is C:\\Program Files\\Exacom, Inc.";
            directory.ShowDialog();
            startpath.Text = directory.SelectedPath;
        }

        private void save(object sender, RoutedEventArgs e)
         {
             MessageBox.Show(dp.Source.ToString());

            if(File.Exists(cfgfile + ".old"))
            {
                File.Delete(cfgfile + ".old");
            }

             File.Move(cfgfile, cfgfile + ".old");
             dp.Document.Save(cfgfile);
         }

        private void remove(object sender, RoutedEventArgs e)
        {
            XmlNode component = dp.Document.DocumentElement["Components"].ChildNodes[components.SelectedIndex];
            dp.Document.DocumentElement["Components"].RemoveChild(component);
        }

        private void temp(object sender, RoutedEventArgs e)
        {
            MessageBox.Show(dp.Document.DocumentElement["Components"].ChildNodes[components.SelectedIndex].InnerText.ToString()); //will this give me trouble????? Probably not since it's my config, but...
        }
        private void test(int id, XmlElement testelement)
        {

            //dp.Document.DocumentElement["Components"].ChildNodes[id] = testelement;
            //XmlNode testnode = dp.Document.DocumentElement["Components"].ChildNodes[id + 1];
            //XmlNode testnode = testelement;
            MessageBox.Show(testelement.OuterXml.ToString());
            //dp.Document.DocumentElement["Components"].InsertAfter(dp.Document.DocumentElement["Components"].ChildNodes[0], testelement);
            //dp.Document.DocumentElement["Components"].RemoveChild(testelement);
            //dp.Document.DocumentElement["Components"].ReplaceChild(testnode, dp.Document.DocumentElement["Components"].ChildNodes[id]);
            dp.Document.DocumentElement["Components"].PrependChild(testelement);

            //dp.Document.NodeChanged();

            //dp.Document.DocumentElement["Components"].CloneNode(true);
            dp.Document.DocumentElement["Components"].AppendChild(testelement);
            //dp.Document.
            //MessageBox.Show(dp.Document.OuterXml.ToString());
            //MessageBox.Show(dp.Document.DocumentElement["Components"].FirstChild.AppendChild(testelement).OuterXml.ToString());
        }


    }
}

Answer 1

JMSA。谢谢你的建议。我今天一直在玩它，我找到了一个解决方案。它有点乱，但很管用。我复制一个当前节点，然后清除所有的值。如果有人感兴趣，这里有代码。

private void add(object sender, RoutedEventArgs e)
{
    System.Xml.XmlNode test = configfile.Document.DocumentElement["Components"].FirstChild;
    System.Xml.XmlNode testclone = test.Clone();
    for (int i = 0; i < testclone.ChildNodes.Count; i++)
    {
        testclone.ChildNodes[i].RemoveAll();
    }

    configfile.Document.DocumentElement["Components"].AppendChild(testclone);
    components.SelectedItem = components.Items.Count + 1;
}

Answer 2

我的建议是使用复合模式为每个元素创建一个类，在类中延迟加载XML文档，并根据需要执行操作。然后再次保存它。不过还是挺多的。