C#读写csv文件 

  1 public class CSVFileHelper
  2 {
  3     /// <summary>
  4     /// 将DataTable中数据写入到CSV文件中
  5     /// </summary>
  6     /// <param name="dt">提供保存数据的DataTable</param>
  7     /// <param name="fileName">CSV的文件路径</param>
  8     public static void SaveCSV(DataTable dt, string fullPath)
  9     {
 10         FileInfo fi = new FileInfo(fullPath);
 11         if (!fi.Directory.Exists)
 12         {
 13             fi.Directory.Create();
 14         }
 15         FileStream fs = new FileStream(fullPath, System.IO.FileMode.Create, System.IO.FileAccess.Write);
 16         //StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.Default);
 17         StreamWriter sw = new StreamWriter(fs, System.Text.Encoding.UTF8);
 18         string data = "";
 19         //写出列名称
 20         for (int i = 0; i < dt.Columns.Count; i++)
 21         {
 22             data += dt.Columns[i].ColumnName.ToString();
 23             if (i < dt.Columns.Count - 1)
 24             {
 25                 data += ",";
 26             }
 27         }
 28         sw.WriteLine(data);
 29         //写出各行数据
 30         for (int i = 0; i < dt.Rows.Count; i++)
 31         {
 32             data = "";
 33             for (int j = 0; j < dt.Columns.Count; j++)
 34             {
 35                 string str = dt.Rows[i][j].ToString();
 36                 str = str.Replace("\"", "\"\"");//替换英文冒号 英文冒号需要换成两个冒号
 37                 if (str.Contains(',') || str.Contains('"') 
 38                     || str.Contains('\r') || str.Contains('\n')) //含逗号 冒号 换行符的需要放到引号中
 39                 {
 40                     str = string.Format("\"{0}\"", str);
 41                 }
 42  
 43                 data += str;
 44                 if (j < dt.Columns.Count - 1)
 45                 {
 46                     data += ",";
 47                 }
 48             }
 49             sw.WriteLine(data);
 50         }
 51         sw.Close();
 52         fs.Close();
 53         DialogResult result = MessageBox.Show("CSV文件保存成功！");
 54         if (result == DialogResult.OK)
 55         {
 56             System.Diagnostics.Process.Start("explorer.exe", Common.PATH_LANG);
 57         }
 58     }
 59  
 60     /// <summary>
 61     /// 将CSV文件的数据读取到DataTable中
 62     /// </summary>
 63     /// <param name="fileName">CSV文件路径</param>
 64     /// <returns>返回读取了CSV数据的DataTable</returns>
 65     public static DataTable OpenCSV(string filePath)
 66     {
 67         Encoding encoding = Common.GetType(filePath); //Encoding.ASCII;//
 68         DataTable dt = new DataTable();
 69         FileStream fs = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read);
 70         
 71         //StreamReader sr = new StreamReader(fs, Encoding.UTF8);
 72         StreamReader sr = new StreamReader(fs, encoding);
 73         //string fileContent = sr.ReadToEnd();
 74         //encoding = sr.CurrentEncoding;
 75         //记录每次读取的一行记录
 76         string strLine = "";
 77         //记录每行记录中的各字段内容
 78         string[] aryLine = null;
 79         string[] tableHead = null;
 80         //标示列数
 81         int columnCount = 0;
 82         //标示是否是读取的第一行
 83         bool IsFirst = true;
 84         //逐行读取CSV中的数据
 85         while ((strLine = sr.ReadLine()) != null)
 86         {
 87             //strLine = Common.ConvertStringUTF8(strLine, encoding);
 88             //strLine = Common.ConvertStringUTF8(strLine);
 89  
 90             if (IsFirst == true)
 91             {
 92                 tableHead = strLine.Split(',');
 93                 IsFirst = false;
 94                 columnCount = tableHead.Length;
 95                 //创建列
 96                 for (int i = 0; i < columnCount; i++)
 97                 {
 98                     DataColumn dc = new DataColumn(tableHead[i]);
 99                     dt.Columns.Add(dc);
100                 }
101             }
102             else
103             {
104                 aryLine = strLine.Split(',');
105                 DataRow dr = dt.NewRow();
106                 for (int j = 0; j < columnCount; j++)
107                 {
108                     dr[j] = aryLine[j];
109                 }
110                 dt.Rows.Add(dr);
111             }
112         }
113         if (aryLine != null && aryLine.Length > 0)
114         {
115             dt.DefaultView.Sort = tableHead[0] + " " + "asc";
116         }
117         
118         sr.Close();
119         fs.Close();
120         return dt;
121     }
122 }

转https://blog.csdn.net/oSKyTonight/article/details/47301851

posted @ 2018-09-05 20:20  露夕逝  阅读(5845)  评论(0)  编辑  收藏  举报