[Excel] CsvHelper---C#关于CSV文件的导入和导出以及转化 （转载）

/// <summary>
/// 联系方式：361983679
/// 更新网站：http://www.cckan.net/thread-655-1-1.html
/// </summary>
using System.Data;
using System.IO;

namespace DotNet.Utilities
{
/// <summary>
/// CSV文件转换类
/// </summary>
public static class CsvHelper
{
/// <summary>
/// 导出报表为Csv
/// </summary>
/// <param name="dt">DataTable</param>
/// <param name="strFilePath">物理路径</param>
/// <param name="tableheader">表头</param>
/// <param name="columname">字段标题,逗号分隔</param>
public static bool dt2csv(DataTable dt, string strFilePath, string tableheader, string columname)
{
try
{
string strBufferLine = "";
StreamWriter strmWriterObj = new StreamWriter(strFilePath, false, System.Text.Encoding.UTF8);
strmWriterObj.WriteLine(tableheader);
strmWriterObj.WriteLine(columname);
for (int i = 0; i < dt.Rows.Count; i++)
{
strBufferLine = "";
for (int j = 0; j < dt.Columns.Count; j++)
{
if (j > 0)
strBufferLine += ",";
strBufferLine += dt.Rows[j].ToString();
}
strmWriterObj.WriteLine(strBufferLine);
}
strmWriterObj.Close();
return true;
}
catch
{
return false;
}
}

/// <summary>
/// 将Csv读入DataTable
/// </summary>
/// <param name="filePath">csv文件路径</param>
/// <param name="n">表示第n行是字段title,第n+1行是记录开始</param>
public static DataTable csv2dt(string filePath, int n, DataTable dt)
{
StreamReader reader = new StreamReader(filePath, System.Text.Encoding.UTF8, false);
int i = 0, m = 0;
reader.Peek();
while (reader.Peek() > 0)
{
m = m + 1;
string str = reader.ReadLine();
if (m >= n + 1)
{
string[] split = str.Split(',');

System.Data.DataRow dr = dt.NewRow();
for (i = 0; i < split.Length; i++)
{
dr = split;
}
dt.Rows.Add(dr);
}
}
return dt;
}
}
}