c#读写csv

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public class CSVFileHelper{    /// <summary>    /// 将DataTable中数据写入到CSV文件中    /// </summary>    /// <param name="dt">提供保存数据的DataTable</param>    /// <param name="fileName">CSV的文件路径</param>    public static void SaveCSV(DataTable dt, string fullPath)    {        FileInfo fi = new FileInfo(fullPath);        if (!fi.Directory.Exists)        {            fi.Directory.Create();        }        FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);        //StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);        StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);        string data = "";        //写出列名称        for (int i = 0; i < dt.Columns.Count; i++)        {            data += dt.Columns[i].ColumnName.ToString();            if (i < dt.Columns.Count - 1)            {                data += ",";            }        }        sw.WriteLine(data);        //写出各行数据        for (int i = 0; i < dt.Rows.Count; i++)        {            data = "";            for (int j = 0; j < dt.Columns.Count; j++)            {                string str = dt.Rows[i][j].ToString();                str = str.Replace("\"", "\"\"");//替换英文冒号 英文冒号需要换成两个冒号                if (str.Contains(',') || str.Contains('"')                     || str.Contains('\r') || str.Contains('\n')) //含逗号 冒号 换行符的需要放到引号中                {                    str = string.Format("\"{0}\"", str);                }                data += str;                if (j < dt.Columns.Count - 1)                {                    data += ",";                }            }            sw.WriteLine(data);        }        sw.Close();        fs.Close();        DialogResult result = MessageBox.Show("CSV文件保存成功！");        if (result == DialogResult.OK)        {            System.Diagnostics.Process.Start("explorer.exe", Common.PATH_LANG);        }    }    /// <summary>    /// 将CSV文件的数据读取到DataTable中    /// </summary>    /// <param name="fileName">CSV文件路径</param>    /// <returns>返回读取了CSV数据的DataTable</returns>    public static DataTable OpenCSV(string filePath)    {        Encoding encoding = Common.GetType(filePath); //Encoding.ASCII;//        DataTable dt = new DataTable();        FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);                //StreamReader sr = new StreamReader(fs, Encoding.UTF8);        StreamReader sr = new StreamReader(fs, encoding);        //string fileContent = sr.ReadToEnd();        //encoding = sr.CurrentEncoding;        //记录每次读取的一行记录        string strLine = "";        //记录每行记录中的各字段内容        string[] aryLine = null;        string[] tableHead = null;        //标示列数        int columnCount = 0;        //标示是否是读取的第一行        bool IsFirst = true;        //逐行读取CSV中的数据        while ((strLine = sr.ReadLine()) != null)        {            //strLine = Common.ConvertStringUTF8(strLine, encoding);            //strLine = Common.ConvertStringUTF8(strLine);            if (IsFirst == true)            {                tableHead = strLine.Split(',');                IsFirst = false;                columnCount = tableHead.Length;                //创建列                for (int i = 0; i < columnCount; i++)                {                    DataColumn dc = new DataColumn(tableHead[i]);                    dt.Columns.Add(dc);                }            }            else            {                aryLine = strLine.Split(',');                DataRow dr = dt.NewRow();                for (int j = 0; j < columnCount; j++)                {                    dr[j] = aryLine[j];                }                dt.Rows.Add(dr);            }        }        if (aryLine != null && aryLine.Length > 0)        {            dt.DefaultView.Sort = tableHead[0] + " " + "asc";        }                sr.Close();        fs.Close();        return dt;    }}
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