[已解决]：通过sql for xml查询到的xml字符串，如何存为标准格式的xml文件？

场景：通过sql for xml查询到的xml字符串，如何存为标准格式的xml文件？

解决方案：

     testXml 只能存为1行；

    而 testXml2 或 testXml3 则能存为标准的xml文件。

private void testXml()
        {
            XmlTextWriter writer = null;
            try
            {
                string filePath = @"D:\tmp\testFile\a.xml";
                writer = new XmlTextWriter(filePath, System.Text.Encoding.UTF8);
                writer.Formatting = Formatting.Indented;
                writer.WriteStartDocument();
                writer.WriteStartElement("Root1");
                writer.WriteString("<a>abcdsf<b><c>ddd</c></b></a>");
            }
            finally
            {
                if (writer != null)
                    writer.Close();
            }
        }

        private void testXml2()
        {
           
            string filePath = @"D:\tmp\testFile\b.xml";

            if (File.Exists(filePath))
            {
                FileInfo fi = new FileInfo(filePath);
                if (fi.Attributes.ToString().IndexOf("ReadOnly") != -1)
                    fi.Attributes = FileAttributes.Normal;

                File.Delete(filePath);
            }

            XmlDocument doc = new XmlDocument();
            doc.LoadXml(@"<?xml version=""1.0"" encoding=""utf-8""?><Root><Name>John</Name><Age>16</Age></Root>");
            StringBuilder sub = new StringBuilder();
            StringWriter sw = new StringWriter(sub);
            XmlTextWriter xw = new XmlTextWriter(sw);
 
            xw.Formatting = Formatting.Indented;
            doc.WriteTo(xw);
            doc.Save(filePath);
            Console.WriteLine(sub);
        }

        private void testXml3()
        {
            string filePath = @"D:\tmp\testFile\c.xml";
             
            if (File.Exists(filePath))
            {
                FileInfo fi = new FileInfo(filePath);
                if (fi.Attributes.ToString().IndexOf("ReadOnly") != -1)
                    fi.Attributes = FileAttributes.Normal;

                File.Delete(filePath);
            }

            String str = @"<?xml version=""1.0"" encoding=""utf-8""?><Root><Name>John</Name><Age>16</Age></Root>";
            StringReader Reader = new StringReader(str);
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(Reader);
            xmlDoc.Save(filePath);
        }

效果图：

其它：

//if (!System.IO.File.Exists(xmlName))
                //{
                //    FileStream fs;
                //    fs = File.Create(xmlName);

                //    StreamWriter srWrite = new StreamWriter(fs, System.Text.Encoding.UTF8);

                //    srWrite.Write(@"<?xml version=""1.0"" encoding=""utf-8""?>" + sFullTree);

                //    srWrite.Close();
                //    srWrite.Dispose();

                //    fs.Close();
                //}  


                if (!System.IO.File.Exists(xmlName))
                {
                    String str = @"<?xml version=""1.0"" encoding=""utf-8""?>" + sFullTree;
                    StringReader Reader = new StringReader(str);
                    XmlDocument xmlDoc = new XmlDocument();
                    xmlDoc.Load(Reader);
                    xmlDoc.Save(xmlName);
                }  

                generate trigger file
                FileStream fs2 = File.Create(triggerName);
                fs2.Close();