class test
    ...{  
       public static DataTable GetDataTable(string xmlStr)
        ...{
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(xmlStr);

            XmlNodeList xlist = doc.SelectNodes("//DataTable/Rows");
            DataTable Dt = new DataTable();
            DataRow Dr;

             for (int i = 0; i < xlist.Count; i++)
             ...{
                Dr = Dt.NewRow();
                XmlElement xe = (XmlElement)xlist.Item(i);
                for (int j = 0; j < xe.Attributes.Count; j++)
                ...{
                    if (!Dt.Columns.Contains("@" + xe.Attributes[j].Name))
                        Dt.Columns.Add("@" + xe.Attributes[j].Name);
                    Dr["@" + xe.Attributes[j].Name] = xe.Attributes[j].Value;
                }
                for (int j = 0; j < xe.ChildNodes.Count; j++)
                ...{
                    if (!Dt.Columns.Contains(xe.ChildNodes.Item(j).Name))
                        Dt.Columns.Add(xe.ChildNodes.Item(j).Name);
                    Dr[xe.ChildNodes.Item(j).Name] = xe.ChildNodes.Item(j).InnerText;
                }
                Dt.Rows.Add(Dr);
            }
            return Dt;
        }


        public static string GetXml(DataTable dt)
        ...{
            string strXml = @"<?xml version='1.0' encoding='UTF-8' ?><DataTable />";
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(strXml);
            XmlNode root = doc.SelectSingleNode("//DataTable");
            // 创建子节点
            for (int j = 0; j < dt.Rows.Count; j++)
            ...{
                XmlElement xe = doc.CreateElement("Rows");
                XmlElement xeChild = null;
                if (!Object.Equals(dt, null))
                ...{
                    for (int i = 0; i < dt.Columns.Count; i++)
                    ...{
                        if (dt.Columns[i].ColumnName.StartsWith("@"))
                        ...{
                            string AttributeName = dt.Columns[i].ColumnName.Replace("@", "");
                            // 为该子节点设置属性
                            xe.SetAttribute(AttributeName, dt.Rows[j][i].ToString());
                        }
                        else
                        ...{
                             xeChild = doc.CreateElement(dt.Columns[i].ColumnName);

                            try
                            ...{
                                xeChild.InnerXml = dt.Rows[j][i].ToString();
                            }
                            catch
                            ...{
                                xeChild.InnerText = dt.Rows[j][i].ToString();
                            }
                            xe.AppendChild(xeChild);
                        }
                    }
                }
                // 保存子节点设置
                root.AppendChild(xe);
            }
            return doc.InnerXml.ToString();
        }
    }
//调用
            DataTable dt = new DataTable("DataTable");
            DataColumn dc1 = new DataColumn("merCode", Type.GetType("System.String"));
            DataColumn dc2 = new DataColumn("crCode", Type.GetType("System.String"));
            DataColumn dc3 = new DataColumn("startDate", Type.GetType("System.String"));
            DataColumn dc4 = new DataColumn("endDate", Type.GetType("System.String"));
            DataColumn dc5 = new DataColumn("hkID", Type.GetType("System.String"));
            DataColumn dc6 = new DataColumn("printNo", Type.GetType("System.String"));
            DataColumn dc7 = new DataColumn("LogInfo", Type.GetType("System.String"));
            dt.Columns.Add(dc1);
            dt.Columns.Add(dc2);
            dt.Columns.Add(dc3);
            dt.Columns.Add(dc4);
            dt.Columns.Add(dc5);
            dt.Columns.Add(dc6);
            dt.Columns.Add(dc7);

            DataRow dr = dt.NewRow();
            dr["merCode"] = "1";
            dr["crCode"] = "1";
            dr["endDate"] = "1";
            dt.Rows.Add(dr);

            dr = dt.NewRow();
            dr["merCode"] = "2";
            dr["crCode"] = "2";
               dr["endDate"] = "2";
            dt.Rows.Add(dr);

            Console.WriteLine(test.GetXml(dt));

            Console.WriteLine("");

            DataTable dts = test.GetDataTable(test.GetXml(dt));
            for (int i = 0; i < dts.Rows.Count; i++)
            ...{
                string str = string.Empty;
                for (int j = 0; j < dts.Columns.Count; j++)
                ...{
                    str += dts.Rows[i][j].ToString();
                }
                Console.WriteLine(str);
            }
            
            Console.ReadLine();