StreamWriter类的使用

      把页面上的内容导出成XML的格式、StreamWriter类
   实现一个TextWriter,使其以一种特定编码向流中写入字符，StreamWriter类能向文件中写入任何的格式

  using (StreamWriter sw = new StreamWriter(Server.MapPath("~/weboa/xmlFile/XMLFile.xml")))
            {
                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    strXml += "<url>"
                        + "<loc>http://baidu.com</loc>"
                        + "<lastmod>" + dt.Rows[i]["UpdateDate"] + "</lastmod>"
                        + "<data>"
                        + "<display>"
                                    + "<title>" + dt.Rows[i]["Title"] + "</title>"
                                    + "<TypeName>" + dt.Rows[i]["TypeName"] + "</TypeName>"
                                    + "<startdate>" + dt.Rows[i]["DateStr"] + "</startdate>"
                                    + "<enddate>" + dt.Rows[i]["DateStr"] + "</enddate>"
                                    + "<city>长沙</city>"
                                    + "<address>长沙红星国际会展中心(高升村南)</address>"
                                    + "<source>红星人才网</source>"
                                    + "<sourcelink>" + strUrl + "</sourcelink>"
                                    + "<joblink></joblink>"
                                    + "<jobwapurl></jobwapurl>"
                                    + "</display>"
                                    + "</data>"
                                + "</url>";                       
                }
                strXml += "</urlset>";
                sw.WriteLine(strXml);
            }