.net 三种拼接数据为DataTable的方法

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1.新建一个空Table存放数据

            //构建新的结果集            DataTable newdt = new DataTable();            try            {                newdt.Columns.Add("ProvinceName");                //数值                newdt.Columns.Add("DataValue1");                //增速-设置格式为数字                newdt.Columns.Add("DataValue2", System.Type.GetType("System.Int32"));                    DataTable dt = showBll.DomesticNeed(typestr2, Sel_time);                    if (dt.Rows.Count > 0)                    {                        for (int i = 0; i < dt.Rows.Count; i++)                        {                            DataRow dr = newdt.NewRow();                            dr["ProvinceName"] = "name1";                                                        dr["DataValue1"] = "Value1";                            dr["DataValue2"] = "Value2";                            newdt.Rows.Add(dr);                         }                     }                           }            catch (Exception)            {                throw;            }            return newdt;

2.将两个格式一致的Table竖拼接在一起

           //竖拼接后得到的DataTable           DataTable Value = new DataTable();           //对拼接后的DataTable进行排序后获得最终的DataTable2            DataTable dt2 = new DataTable();            //获取需要循环的第一个数据            DataTable dt = GetProvinceall();            if (dt.Rows.Count > 0)            {                for (int i = 0; i < dt.Rows.Count; i++)                {                    string id = dt.Rows[i]["ID"].ToString();                    DataTable Valuedt = GetNeedData(id);                    if (Valuedt.Rows.Count > 0)                    {                    //进行竖拼接                        Value.Merge(Valuedt);                    }                }            }//对新的Table中字段进行排序            if (Value.Rows.Count > 0)            {                DataView dv = Value.DefaultView;                dv.Sort = "tongsu desc";                dt2 = dv.ToTable();            }            return dt2;

3.将两个DataTable 横拼接在一起

//引用方法DataTable newdt=UniteDataTable(dtlist1, dtlist2, "newdt"); //两个Data合并  private DataTable UniteDataTable(DataTable dt1, DataTable dt2, string DTName)        {            DataTable dt3 = dt1.Clone();            for (int i = 0; i < dt2.Columns.Count; i++)            {                dt3.Columns.Add(dt2.Columns[i].ColumnName);            }            object[] obj = new object[dt3.Columns.Count];            for (int i = 0; i < dt1.Rows.Count; i++)            {                dt1.Rows[i].ItemArray.CopyTo(obj, 0);                dt3.Rows.Add(obj);            }            if (dt1.Rows.Count >= dt2.Rows.Count)            {                for (int i = 0; i < dt2.Rows.Count; i++)                {                    for (int j = 0; j < dt2.Columns.Count; j++)                    {                        dt3.Rows[i][j + dt1.Columns.Count] = dt2.Rows[i][j].ToString();                    }                }            }            else            {                DataRow dr3;                for (int i = 0; i < dt2.Rows.Count - dt1.Rows.Count; i++)                {                    dr3 = dt3.NewRow();                    dt3.Rows.Add(dr3);                }                for (int i = 0; i < dt2.Rows.Count; i++)                {                    for (int j = 0; j < dt2.Columns.Count; j++)                    {                        dt3.Rows[i][j + dt1.Columns.Count] = dt2.Rows[i][j].ToString();                    }                }            }            dt3.TableName = DTName;            return dt3;        }

菜鸟总结多存疏漏感谢指正

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