using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //創(chuàng)建一個(gè)DataTable
            DataTable dtDemo = GetDataTable();
            DataRow myDr;

            //Detached row:該行已經(jīng)被創(chuàng)建，但不屬于任何DataRowCollection
            myDr = dtDemo.NewRow();
            Console.WriteLine("New Row狀態(tài):"+myDr.RowState);
            //將新創(chuàng)建的行添加到DataTable中
            dtDemo.Rows.Add(myDr);
            Console.WriteLine("Add Row狀態(tài):"+myDr.RowState);

            #region Add之后直接使用Delete，RowState變?yōu)镈etached,  行數(shù)-1
            //myDr.Delete();
            //Console.WriteLine("myDr的狀態(tài)：" + myDr.RowState);
            //Console.WriteLine("dtDemo的行數(shù):" + dtDemo.Rows.Count.ToString());
            #endregion

            dtDemo.AcceptChanges();
            Console.WriteLine("AcceptChanges狀態(tài):" + myDr.RowState);
            //修改
            myDr["Name"] = "Tom";
            Console.WriteLine("Modified狀態(tài):" + myDr.RowState);
            Console.WriteLine("刪除前的行數(shù):" + dtDemo.Rows.Count.ToString());

            #region 非Added狀態(tài)下使用Delete，RowState變?yōu)镈eleted,  行數(shù)不變
            myDr.Delete();
            Console.WriteLine("Deleted狀態(tài):" + myDr.RowState);
            Console.WriteLine("刪除后的行數(shù):" + dtDemo.Rows.Count.ToString());
            #endregion

            //這時(shí)myDr的狀態(tài)變?yōu)镈etached
            Console.WriteLine("myDr的狀態(tài)：" + myDr.RowState);
            //重新加入myDr，這時(shí)狀態(tài)變?yōu)锳dded
            dtDemo.Rows.Add(myDr);
            Console.WriteLine("myDr的狀態(tài)：" + myDr.RowState);
            //取消刪除行
            //dtDemo.RejectChanges();
            Console.ReadKey();
        }

        /// <summary>
        /// 創(chuàng)建一個(gè)空的DataTable
        /// </summary>
        /// <returns></returns>
        static DataTable GetDataTable()
        {
            DataTable dt = new DataTable("MyTable");
            DataColumn dc = new DataColumn("Name", typeof(string));
            dt.Columns.Add(dc);
            return dt;
        }
    }
}