c#读写txt文件

1//write txt
2StringBuilder builder = new StringBuilder();
3FileStream fs = new FileStream(saveFileName, FileMode.Create);
4StreamWriter sw = new StreamWriter(fs, Encoding.Default);
5for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
6{
7    
8    DataRow dr = ds.Tables[0].Rows[i];
9    builder.AppendLine(dr["netsn"] + "," + dr["imei"]); //产品S/N号 + IMEI号
10}
11sw.Write(builder);
12sw.Close();
13fs.Close();
14
15if (System.IO.File.Exists(saveFileName))
16{
17    System.Diagnostics.Process.Start(saveFileName); //保存成功后打开此文件
18}
19
20
21//read txt
22string[] allLines = File.ReadAllLines(filePath);

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