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 = "[email protected]" });            list.Add(new Person() { Name = "李四", Age = 29, Email = "[email protected]" });            list.Add(new Person() { Name = "王五", Age = 39, Email = "[email protected]" });            list.Add(new Person() { Name = "赵六", Age = 9, Email = "[email protected]" });            //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:\Configurations\myXml.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;            }        }