///<summary>   
        /// 将两个列不同的DataTable合并成一个新的DataTable   
        ///</summary>   
        ///<param name="dt1">源表</param>   
        ///<param name="dt2">需要合并的表</param>   
        ///<param name="primaryKey">需要排重列表（为空不排重）</param>   
        ///<param name="maxRows">合并后Table的最大行数</param>   
        ///<returns>合并后的datatable</returns>
        public static DataTable MergeDataTable(DataTable dt1, DataTable dt2, string primaryKey, int maxRows)
        {
            //判断是否需要合并
            if (dt1 == null && dt2 == null)
            {
                return null;
            }
            if (dt1 == null && dt2 != null)
            {
                return dt2.Copy();
            }
            else if (dt1 != null && dt2 == null)
            {
                return dt1.Copy();
            }
            //复制dt1的数据
            DataTable dt = dt1.Copy();
            //补充dt2的结构（dt1中没有的列）到dt中
            for (int i = 0; i < dt2.Columns.Count; i++)
            {
                string cName = dt2.Columns[i].ColumnName;
                if (!dt.Columns.Contains(cName))
                {
                    dt.Columns.Add(new DataColumn(cName));
                }
            }
            //复制dt2的数据
            if (dt2.Rows.Count > 0)
            {
                Type t = dt2.Rows[0][primaryKey].GetType();
                bool isNeedFilter = string.IsNullOrEmpty(primaryKey) ? false : true;
                bool isNeedQuotes = t.Name == "String" ? true : false;
                int mergeTableNum = dt.Rows.Count;
                for (int i = 0; i < dt2.Rows.Count && mergeTableNum < maxRows; i++)
                {
                    bool isNeedAdd = true;
                    //如果需要排重时，判断是否需要添加当前行
                    if (isNeedFilter)
                    {
                        string primaryValue = dt2.Rows[i][primaryKey].ToString();
                        string fileter = primaryKey + "=" + primaryValue;
                        if(isNeedQuotes)
                        {
                            fileter = primaryKey + "='" + primaryValue + "'";
                        }
                        DataRow[] drs = dt.Select(fileter);
                        if (drs != null && drs.Length > 0)
                        {
                            isNeedAdd = false;
                        }
                    }
                    //添加数据
                    if (isNeedAdd)
                    {
                        DataRow dr = dt.NewRow();
                        for (int j = 0; j < dt.Columns.Count; j++)
                        {
                            string cName = dt.Columns[j].ColumnName;
                            if (dt2.Columns.Contains(cName))
                            {
                               //防止因同一字段不同类型赋值出错
                               if (dt2.Rows[i][cName] != null && dt2.Rows[i][cName] != DBNull.Value && dt2.Rows[i][cName].ToString() != "")
                               {
                                  dr[cName] = dt2.Rows[i][cName];
                               }
                            }
                        }
                        dt.Rows.Add(dr);
                        mergeTableNum++;
                    }
                }
            }
            return dt;
        }

    /// <summary>
    /// 获取置业专家列表
    /// </summary>
    /// <returns>置业专家列表</returns>
    public static DataTable GetAgentXML()
    {
        DataTable dt = null;
        string cacheName = "agentall_zyzj";
        if (CacheManager.IsCached(cacheName))
        {
            object o = CacheManager.GetCache(cacheName);
            if (o != null)
            {
                dt = o as DataTable;
            }
        }
        if (dt == null)
        {
            //读取xml文件到DataTable中
              dt = GetAgentXMLFromFile();
            if (dt != null)
            {
                try
                {
                    if (dt.Rows.Count > 0)
                    {
                        dt.PrimaryKey = new DataColumn[] { dt.Columns["newcode"], dt.Columns["agentid"] };
                    }
                }
                catch
                { }
                CacheManager.InsertCache(cacheName, dt, System.DateTime.Now.AddMinutes(60));
            }
        }
        return dt;
    }    
    /// <summary>
    /// 判断是否为置业专家
    /// </summary>
    /// <returns>是否为置业专家</returns>
    public static bool CheckZyzj(long agentID, long newCode)
    {
        DataTable Agentdt = new DataTable();
        bool isZyzj = false;
        try
        {
            Agentdt = GetAgentXML();
            if (Agentdt != null && Agentdt.Rows.Count > 0)
            {
                DataRow[] drs = Agentdt.Select(" agentid=" + agentID + " and newcode=" + newCode);
                if (drs != null && drs.Length > 0)
                {
                    isZyzj = true;
                }
            }
        }
        catch (Exception ex)
        {
            isZyzj = false;
        }
        return isZyzj;
    }