在这也说明下，除此之外还可以通过 DataView 的方式来处理，当个人觉得这有点不好用。这里就不多作说明了
代码比较简单，直接看代码
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq; namespace DTS
{
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"] = "xiaodong";
_dr["address"] = "beijing";
_dt.Rows.Add(_dr);
_dt.Rows.Add(_dr.ItemArray);
_dt.Rows.Add(_dr.ItemArray);
_dr = _dt.NewRow(); _dr["id"] = ;
_dr["name"] = "xiaodong";
_dr["address"] = "shanghai";
_dt.Rows.Add(_dr);
_dr = _dt.NewRow(); _dr["id"] = ;
_dr["name"] = "xiaoming";
_dr["address"] = "guangdong";
_dt.Rows.Add(_dr);
_dr = _dt.NewRow(); _dr["id"] = ;
_dr["name"] = "xudaxia";
_dr["address"] = "fujian";
_dt.Rows.Add(_dr);
_dt.Rows.Add(_dr.ItemArray);
Console.WriteLine("--------------------原来有重复数据的Table----------------------");
_dt.AsEnumerable().ToList().ForEach(
m=>
{
Console.WriteLine(m["id"].ToString() + " " + m["name"].ToString() + " " + m["address"].ToString());
}); Console.WriteLine("--------------------去除重复后的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.Read();
}
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") && x.Field<string>("name") == y.Field<string>("name") && x.Field<string>("address") == y.Field<string>("address")));
} public int GetHashCode(DataRow obj)
{
return obj.ToString().GetHashCode();
} #endregion
} }
}
昨晚（2015-10-11）想了个对以上代码优化的办法，事比较多早上补上：
public static DataTable DistinctSomeColumn(DataTable sourceTable, params string[] fieldName)
{
if (fieldName == null || fieldName.Length == ) return sourceTable;
return sourceTable.AsEnumerable().Distinct(new ColumnEquals(fieldName)).CopyToDataTable();
} public class ColumnEquals : IEqualityComparer<DataRow>
{
public ColumnEquals(string[] sArr)
{
_sArr = sArr;
} private string[] _sArr; public bool Equals(DataRow x, DataRow y)
{
return !_sArr.Any(p => !x[p].Equals(y[p]));
} public int GetHashCode(DataRow dr)
{
return dr.ToString().GetHashCode();
}
}