将DataSet转化成XML格式的String类型,再转化回来。

/// <summary>
        /// 获取DataSet的Xml格式
        /// </summary>
        public static string GetDataSetXml(this DataSet dataSet)
        {
            string str = string.Empty;
            str += "<NewDataSet>";
            for (int k = 0; k < dataSet.Tables.Count; k++)
            {
                for (int i = 0; i < dataSet.Tables[k].Rows.Count; i++)
                {
                    if (dataSet.Tables[k].TableName == "")
                    {
                        dataSet.Tables[k].TableName = "table" + k;
                    }
                    str += "<" + dataSet.Tables[k].TableName + ">";
                    for (int j = 0; j < dataSet.Tables[k].Columns.Count; j++)
                    {
                        string clName = dataSet.Tables[k].Columns[j].ColumnName;
                        str += "<" + clName + ">" + dataSet.Tables[k].Rows[i][clName].ToString().Replace("<", "&lt;").Replace(">", "&gt;") + "</" + clName + ">";
                    }
                    str += "</" + dataSet.Tables[k].TableName + ">";
                }
            }

            str += "</NewDataSet>";
            str = str.Replace("&", "&amp;");
            str = str.Replace("‘", "&apos;");
            str = str.Replace("\"", "&quot;");
            return str;
        }

                    DataSet dsLV = new DataSet();
                    string decryptedData = Decrypt(xmlDSLV);  //解密XML数据源
                    StringReader sr = new StringReader(decryptedData);
                    dsLV.ReadXml(sr);    //将数据读入DataSet
                    sr.Close();