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C#两个DAtAtABlE关联

string colNo = "货号"; string colExist = "现有数量"; dtA.Columns.Add(colExist);//先给A表添加列 var rowsB = dtB.Rows.OfType(); //填充 foreach (DataRow row in dtA.Rows) { row[colExist] = rowsB.First(x => x[colNo] == row[colNo]) ...

用DataSet 做 join 可以参考; public static DataTable Join (DataTable First, DataTable Second, DataColumn[] FJC, DataColumn[] SJC) { //创建一个新的DataTable DataTable table = new DataTable("Join"); // Use a DataSet to leverage Da...

//表aDataTable a = new DataTable();a.Columns.Add("id", typeof(int));a.Columns.Add("sn", typeof(int));a.Columns.Add("kc", typeof(int));//表bDataTable b = new DataTable();b.Columns.Add("id", typeof(int));b.Columns.Add("sn", typeo...

//原本的两个datatable1和datatable2DataTable DataTable1, DataTable2//两个结构一样的DT合并DataTable newDataTable = DataTable1.Clone();object[] obj = new object[newDataTable.Columns.Count];for (int i = 0; i < DataTable1.Rows.Count...

dataset 有个合并函数 using (SqlConnection connection = new SqlConnection(connectionString)) { SqlDataAdapter adapter = new SqlDataAdapter( "SELECT CustomerID, CompanyName FROM dbo.Customers", connection); connection.Open(); Dat...

具体方法如下: DataTable dt = ""; //这里是填充DataTable数据 DataTable dtNew = dt.Copy(); //复制dt表数据结构 dtNew.Clear() //清楚数据 for (int i = 0; i < dt.Rows.Count; i++) { if (条件语句) { dtNew.Rows.Add(dt.Rows[i].ItemArray)...

DataTable dtB = new DataTable();//假设这就是你已经查询出来的B表DataTable dtA = new DataTable();//假设这就是你已经查询出来的A表if (null == dtB) throw new DataException("B表没有数据");//只要A有数据,不要这句不影响,写这个只是习惯b...

DataTable dt1 = GetDataTable();//你说的DataTable DataTable dt2 = dt1.Clone();//复制下你说的那个表的表结构 DataRow[] drs = null; foreach( DataRow dr in dt1 ) { drs = dt2.Select( "姓名='" + dr["姓名"].ToString() + "'" );//查找dt2...

DataTable dt1 = new DataTable(); DataTable dt2 = new DataTable(); 如果dt1 和 dt2结构相同,又要想办法将dt1和dt2的数据合并到一个datatable中则可以使用如下方法: 1、新建一个DataTable DataTable dt = new DataTable(); 2、是dt的结构和d...

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