using System;using System.Collections.Generic;using System.Data;using System.Linq;using System.Text;using System.Threading.Tasks;namespace ConsoleApplication1{    class Program    {        private static void PrintValues(DataTable table)        {            string label = table.TableName;            Console.WriteLine("TableName: " + table.TableName);            foreach (DataColumn column in table.Columns)            {                Console.Write("\t " + column.ColumnName);            }            Console.WriteLine();            foreach (DataRow row in table.Rows)            {                foreach (DataColumn column in table.Columns)                {                    Console.Write("\t |{0}|", row[column]);                }                Console.WriteLine();            }        }        static void Main(string[] args)        {            DataTable dtWs = new DataTable("dtWs");            //DataColumn dcWsWId = new DataColumn("WID", Type.GetType("System.Int32"));//“System.Data.DataException”类型的未经处理的异常在 System.Data.dll 中发生其他信息: < target >.WID 和<source>.WID 擁有衝突的屬性: DataType 屬性不符。            DataColumn dcWsWId = new DataColumn("WID", Type.GetType("System.String"));            DataColumn dcWsFId = new DataColumn("FID", Type.GetType("System.String"));            DataColumn dcBNId = new DataColumn("ADD", Type.GetType("System.String"));            dtWs.Columns.Add(dcWsWId);            dtWs.Columns.Add(dcWsFId);            dtWs.Columns.Add(dcBNId);            dtWs.PrimaryKey = new DataColumn[] { dcWsWId, dcWsFId };            for (int i = 0; i < 5; i++)            {                DataRow drNew = dtWs.NewRow();                drNew["WID"] = i;                drNew["FID"] = "";                drNew["ADD"] = "BBBB" + i;                dtWs.Rows.Add(drNew);            }            PrintValues(dtWs);            DataTable dtQry = new DataTable("dtQry");            DataColumn dcWId = new DataColumn("WID", Type.GetType("System.String"));            DataColumn dcFId = new DataColumn("FID", Type.GetType("System.String"));            DataColumn dcNId = new DataColumn("Name", Type.GetType("System.String"));            dtQry.Columns.Add(dcWId);            dtQry.Columns.Add(dcFId);            dtQry.Columns.Add(dcNId);            dtQry.PrimaryKey = new DataColumn[] { dcWId, dcFId };            for (int i = 3; i < 8; i++)            {                DataRow drNew = dtQry.NewRow();                drNew["WID"] = i;                drNew["FID"] = "";                drNew["Name"] = "AAAA" + i;                dtQry.Rows.Add(drNew);            }            PrintValues(dtQry);            dtQry.Merge(dtWs, true, MissingSchemaAction.AddWithKey);            PrintValues(dtQry);            dtQry.Merge(dtWs, false, MissingSchemaAction.AddWithKey);            PrintValues(dtQry);            Console.Read();        }    }}