转:去掉DataTable重复数据（程序示例比较）

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace RemoveDupRowDemoTest
{
class Program
{
static void Main(string[] args)
{
DataTable _dt = new DataTable();
_dt.Columns.Add("id", typeof(int));
_dt.Columns.Add("name", typeof(string));
_dt.Columns.Add("address", typeof(string)); DataRow _dr = _dt.NewRow();
_dr["id"] = ;
_dr["name"] = "lipeng";
_dr["address"] = "DongXiaoKou";
_dt.Rows.Add(_dr);
_dt.Rows.Add(_dr.ItemArray);
_dt.Rows.Add(_dr.ItemArray);
_dr = _dt.NewRow();
_dr["id"] = ;
_dr["name"] = "xiaoNa";
_dr["address"] = "DongXiaoKou";
_dt.Rows.Add(_dr);
_dr = _dt.NewRow();
_dr["id"] = ;
_dr["name"] = "BingLi";
_dr["address"] = "TianTongYuan";
_dt.Rows.Add(_dr);
_dt.Rows.Add(_dr.ItemArray);
Console.WriteLine("--------------------原来有重复数据的Table----------------------");
_dt.AsEnumerable().ToList().ForEach(
x =>
{
Console.WriteLine(x["id"].ToString() + " " + x["name"].ToString() + " " + x["address"].ToString());
}); Console.WriteLine(); Console.WriteLine("--------------------用Linq去重复后的Table----------------------"); var _comPresult = _dt.AsEnumerable().Distinct(new DataTableRowCompare());
DataTable _resultDt = _comPresult.CopyToDataTable(); _resultDt.AsEnumerable().ToList().ForEach(
x =>
{
Console.WriteLine(x["id"].ToString() + " " + x["name"].ToString() + " " + x["address"].ToString());
}); Console.WriteLine(); Console.WriteLine("--------------------用DefaultView去重复后的Table----------------------");
DataTable _dtDefalut = _dt.DefaultView.ToTable(true, "id", "name", "address"); _dtDefalut.AsEnumerable().ToList().ForEach(
x =>
{
Console.WriteLine(x["id"].ToString() + " " + x["name"].ToString() + " " + x["address"].ToString());
}); Console.ReadLine();
}
}
public class DataTableRowCompare : IEqualityComparer<DataRow>
{ #region IEqualityComparer<DataRow> 成员 public bool Equals(DataRow x, DataRow y)
{
return (x.Field<int>("id") == y.Field<int>("id"));
} public int GetHashCode(DataRow obj)
{
return obj.ToString().GetHashCode();
} #endregion
}
}