xml转换csv

        /// <summary>
        /// xml文件转换为CSV
        /// </summary>
        /// <param name="fileName">xml格式文件</param>
        /// <returns>true - CSV转换成功</returns>
        private static bool ToCSV(string fileName)
        {
            var xmlFilePath = @"e:ceshi.xml"; //System.IO.Path.GetDirectoryName(System.Reflection.Assembly.GetEntryAssembly().Location) + @"" + fileName;

            var csv = System.Xml.Linq.XElement.Load(xmlFilePath).Elements("Check")
                             .Where(a => a.Attribute("Name").Value == "Windows Security Updates")
                            .Elements("Detail").Elements("UpdateData")
                            .Where(a => a.Attribute("IsInstalled").Value == "false")
                            .OrderByDescending(a => a.Attribute("Severity").Value)
                            .Select(b => string.Format("{0},{1},{2}",
                                                        "KB" + (string)b.Attribute("KBID"),
                                                        (int)b.Attribute("Severity"),
                                                        Environment.NewLine
                                                        ))
                            .Aggregate(new StringBuilder(), (sb, s) => sb.Append(s), sb => sb.ToString());

            string csvPath = xmlFilePath.Substring(0, xmlFilePath.Length - 3) + "csv";
            System.Text.Encoding enc = System.Text.Encoding.GetEncoding("shift_jis");

            using (System.IO.StreamWriter sw = new System.IO.StreamWriter(csvPath, false, enc))
            {
                // 如果要在标题的开头显示ID列，请将其括在双引号中
                // See: http://pasofaq.jp/office/excel/sylk.htm
                string header = "KBID,Severity";
                sw.WriteLine(header);

                sw.WriteLine(csv);
            }

            return true;
        }