将csv文件读入DataTable数据表

using System;
using System.Threading;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.IO;

namespace DataTable_Test
{
    class Program
    {
    	/// 

        /// 将csv文件读入DataTable数据表
        /// 
        /// csv文件路径
        /// 表示csv文件的第n行是字段title, 第n+1行开始为一条数据
        /// 参数dt 是个空白的、没有任何行列的DataTable
        /// 读取csv文件结果：DataTable数据表
        static DataTable csv2dt(string filePath, int n, DataTable dt) 
        {
            String csvSplitBy = "(?<=^|,)(\"(?:[^\"]|\"\")*\"|[^,]*)";
            StreamReader reader = new StreamReader(filePath, System.Text.Encoding.Default, false);
            int i = 0, m = 0;
            reader.Peek();
            while (reader.Peek() > 0)
            {
                m = m + 1;
                string str = reader.ReadLine();
                if (m >= n + 1)
                {
                    if (m == n + 1) //如果是字段行，则自动加入字段。
                    {
                        MatchCollection mcs = Regex.Matches(str, csvSplitBy);
                        foreach (Match mc in mcs)
                        {
                            dt.Columns.Add(mc.Value); //增加列标题
                        }
                    }
                    else
                    {
                        MatchCollection mcs = Regex.Matches(str, "(?<=^|,)(\"(?:[^\"]|\"\")*\"|[^,]*)");
                        i = 0;
                        System.Data.DataRow dr = dt.NewRow();
                        foreach (Match mc in mcs)
                        {
                            dr[i] = mc.Value;
                            i++;
                        }
                        dt.Rows.Add(dr);  //DataTable 增加一行     
                    }
                }
            }
            return dt;
        }
    }
}