Asp.Net写入读取Xml(处理文件权限)

1，网上关于读取写入Xml的博客比较多，参考了发现提到Xml文件权限的博客比较少。因为在开发中我发现，如果文件存于一些没有权限的路径，代码是访问不到该文件，页面会报错提示403，Forbidden。意思是禁止，也就是没有权限。需要用代码给文件EveryOne赋予完全控制权限。希望我的博客能帮助一些在权限方面遇到问题的朋友。

2，判断文件文件夹和文件是否存在(写入时会自动创建Xml，但是如果没有权限，会创建失败，所以我觉得先用FileStream把文件创建出来比较保险);

public string CreateFolder()
        {
            string fileName = "myXml";
            string folderPath = "C:\Configurations";
            string filePath = @"C:\Configurations" + fileName + ".xml";
            if (!Directory.Exists(folderPath))
            {
                Directory.CreateDirectory(folderPath);
                //给文件夹Everyone赋完全控制权限
                DirectorySecurity folderSec = new DirectorySecurity();
                folderSec.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));
                System.IO.Directory.SetAccessControl(folderPath, folderSec);
                CreateFile(filePath);

            }
            else
            {
                CreateFile(filePath);
            }
            return filePath;
        }

public void CreateFile(string filePath)
        {
            if (!File.Exists(filePath))
            {
                using (FileStream fs1 = new FileStream(filePath, FileMode.Create, FileAccess.Write))
                {
                    //给Xml文件EveryOne赋完全控制权限
                    DirectorySecurity fSec = new DirectorySecurity();
                    fSec.AddAccessRule(new FileSystemAccessRule("Everyone", FileSystemRights.FullControl, InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit, PropagationFlags.None, AccessControlType.Allow));
                    System.IO.Directory.SetAccessControl(filePath, fSec);
                }

            }
        }

3，文件夹和文件都创建出来以后就是写入了。

(1)Xml有几个重要的对象。、|XmlDocument，Xml文档对象|XmlDeclaration，Xml文档定义对象|XmlElement，Xml节点对象|XmlAttrbute，Xml节点属性对象|

了解了这几个对象，开发起来就比较顺了。

List<Person> list = new List<Person>();
            list.Add(new Person() { Name = "张三", Age = 19, Email = "hl@yahoo.com" });
            list.Add(new Person() { Name = "李四", Age = 29, Email = "xzl@yahoo.com" });
            list.Add(new Person() { Name = "王五", Age = 39, Email = "hhw@yahoo.com" });
            list.Add(new Person() { Name = "赵六", Age = 9, Email = "ys@yahoo.com" });


            //1.创建一个Dom对象
            XmlDocument xDoc = new XmlDocument();
            //2.编写文档定义
            XmlDeclaration xmlDec = xDoc.CreateXmlDeclaration("1.0", "utf-8", null);
            xDoc.AppendChild(xmlDec);

            //3.编写一个根节点
            XmlElement xmlRoot = xDoc.CreateElement("List");
            xDoc.AppendChild(xmlRoot);

            
            //4.循环创建Person节点
            for (int i = 0; i < list.Count; i++)
            {
                //4.1创建一个Person元素
                XmlElement xmlPerson = xDoc.CreateElement("Person");
                XmlAttribute xmlAttrId = xDoc.CreateAttribute("id");
                xmlAttrId.Value = (i + 1).ToString();
                //将属性增加到Person节点中
                xmlPerson.Attributes.Append(xmlAttrId);

                //4.2在这里向Person节点下增加子节点
                //创建Name
                XmlElement xmlName = xDoc.CreateElement("Name");
                xmlName.InnerText = list[i].Name;
                xmlPerson.AppendChild(xmlName);

                //创建Age
                XmlElement xmlAge = xDoc.CreateElement("Age");
                xmlAge.InnerText = list[i].Age.ToString();
                xmlPerson.AppendChild(xmlAge);

                //创建一个Email节点

                XmlElement xmlEmail = xDoc.CreateElement("Email");
                xmlEmail.InnerText = list[i].Email;
                xmlPerson.AppendChild(xmlEmail);

                //最后把Person加到根节点下
                xmlRoot.AppendChild(xmlPerson);

            }

            

            //5.将xmlDocument对象写入到文件中
            xDoc.Save(@"C:ConfigurationsmyXml.xml");

4，Xml读取

public DataTable GetDataFromXml()
        {
            string fileName = "myXml";
            string filePath = @"C:\Configurations" + fileName + ".xml";
            DataTable dt = this.BuildDataTable();
            try
            {
                XmlDocument document = new XmlDocument();
                document.Load(filePath);
                XmlElement rootElement = document.DocumentElement;

                dt = LoadToTreeByXmlDocument(rootElement, dt);

                return dt;
            }
            catch
            {
                return dt;
            }
        }
private DataTable LoadToTreeByXmlDocument(XmlElement rootElement, DataTable dt)
        {
            try
            {
                foreach (XmlNode node in rootElement.ChildNodes)
                {
                    if (node.NodeType == XmlNodeType.Element)
                    {
                        DataRow dr = dt.NewRow();
                        foreach (DataColumn dc in dt.Columns)
                        {
                            dr[dc.ColumnName] = node.Attributes[dc.ColumnName] == null ? "" : node.Attributes[dc.ColumnName].Value;
                        }
                        dt.Rows.Add(dr);
                        //遍历二级节点
                        foreach (XmlNode subNode in node.ChildNodes)
                        {
                            if (subNode.NodeType == XmlNodeType.Element)
                            {
                                DataRow subDr = dt.NewRow();
                                foreach (DataColumn dc in dt.Columns)
                                {
                                    subDr[dc.ColumnName] = subNode.Attributes[dc.ColumnName] == null ? "" : subNode.Attributes[dc.ColumnName].Value;
                                }
                                dt.Rows.Add(subDr);
                            }
                        }
                    }
                }
                return dt;
            }
            catch
            {
                return dt;
            }
        }