csv操作帮助类

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;

namespace IM.Common
{
/// <summary>
///  csv操作
/// <para>创建作者：changjin</para>
/// <para>创建日期：2011/06/17</para>
/// </summary>
public class CsvHelper
{
public static string _seperator = ",";
public static string _bracer = "\"";
public static string _newline = "\n";
public static string _regex_special = ".*[,\n\"].*";

/// <summary>
/// 集合转换为csv数据
/// <para>创建作者：changjin</para>
/// <para>创建日期：2011/06/17</para>
/// </summary>
/// <param name="list">数据集合，行、列</param>
/// <returns>csv数据</returns>
public static string ToCsvData(List<List<string>> list)
{
string temp = string.Empty;
System.Text.StringBuilder sb = new System.Text.StringBuilder();
foreach (List<string> row in list)
{
for (int i = 0; i < row.Count; i++)
{
temp = row[i];
temp = (temp != null ? temp : "");
if (i != 0)
{
sb.Append(_seperator);
}
if (temp.Contains(_seperator) || temp.Contains(_bracer) || temp.Contains(_newline))
{
if (temp.Contains(_bracer))
{
temp = temp.Replace(_bracer, _bracer + _bracer);
}
if (temp.Contains(_newline))
{
temp = temp.Replace(_newline, "<br/>");
}
sb.Append(_bracer + temp + _bracer);
}
else
{
sb.Append(temp);
}
if (i == row.Count - 1)
{
sb.Append(_newline);
}
}
}
return sb.ToString();
}

/// <summary>
/// DataSe转换为csv数据
/// <para>创建作者：changjin</para>
/// <para>创建日期：2011/06/17</para>
/// </summary>
/// <param name="ds">数据集</param>
/// <returns>csv数据</returns>
public static string ToCsvData(DataSet ds)
{
List<List<string>> list = new List<List<string>>();
if (ds != null && ds.Tables.Count > 0 && ds.Tables[0] != null)
{
DataTable dt = ds.Tables[0];
List<string> columnNameList = new List<string>();
//添加列
if (dt.Columns.Count > 0)
{
foreach (DataColumn column in dt.Columns)
{
columnNameList.Add(column.ColumnName);
}
list.Add(columnNameList);
}
//迭代添加行记录
foreach (DataRow row in dt.Rows)
{
List<string> rowData = new List<string>();
foreach (string columnName in columnNameList)
{
rowData.Add(Convert.ToString(row[columnName]));
}
list.Add(rowData);
}
}
return ToCsvData(list);
}
}
}