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)
        {
            //創建一個DataTable
            DataTable dtDemo = GetDataTable();
            DataRow myDr;

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

            #region Add之后直接使用Delete，RowState變為Detached,  行數-1
            //myDr.Delete();
            //Console.WriteLine("myDr的狀態：" + myDr.RowState);
            //Console.WriteLine("dtDemo的行數:" + dtDemo.Rows.Count.ToString());
            #endregion

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

            #region 非Added狀態下使用Delete，RowState變為Deleted,  行數不變
            myDr.Delete();
            Console.WriteLine("Deleted狀態:" + myDr.RowState);
            Console.WriteLine("刪除后的行數:" + dtDemo.Rows.Count.ToString());
            #endregion

            //這時myDr的狀態變為Detached
            Console.WriteLine("myDr的狀態：" + myDr.RowState);
            //重新加入myDr，這時狀態變為Added
            dtDemo.Rows.Add(myDr);
            Console.WriteLine("myDr的狀態：" + myDr.RowState);
            //取消刪除行
            //dtDemo.RejectChanges();
            Console.ReadKey();
        }

        /// 

        /// 創建一個空的DataTable
        /// 
        /// 
        static DataTable GetDataTable()
        {
            DataTable dt = new DataTable("MyTable");
            DataColumn dc = new DataColumn("Name", typeof(string));
            dt.Columns.Add(dc);
            return dt;
        }
    }
}