读取和写入txt文件

命名空间：using System.IO;

读取txt文件内容：

string filePath =  "111.txt";
FileStream fs = new FileStream(filePath, FileMode.Open);
StreamReader strReader = new StreamReader(fs,Encoding.Default);
string sLine = "";

dtDetails = DMaterialInventory.CreateTmpTable();
 while (!strReader.EndOfStream)
{
        sLine = strReader.ReadLine();
        string[] cList = sLine.Split(',');
        DataRow dtRow = dtDetails.NewRow();
        dtRow["编码"] = cList[0].ToString();
        Msg.InfoBox(cList[1].ToString());
        dtRow["姓名"] = cList[1].ToString();
        dtRow["数量"] = cList[2].ToString();
        dtDetails.Rows.Add(dtRow);
}
strReader.Close();
fs.Close();

 

写入内容到txt文件：

public bool SaveTXT(DataTable dt)
        {
            try
            {
                string filePath = "111.txt";
                FileStream fs = new FileStream(filePath, FileMode.Open);
                StreamWriter strWriter = new StreamWriter(fs, Encoding.Default);
                foreach (DataRow row in dt.Rows)
                {
                    string strData = "";
                    foreach (DataColumn col in dt.Columns)
                    {
                        strData += row[col.ColumnName].ToString();
                        strData += ",";
                    }
                    strData = strData.Substring(0, strData.Length - 1);
                    Msg.InfoBox(strData);
                    strWriter.WriteLine(strData);
                }
                strWriter.Close();
                fs.Close();
                return true;
            }
            catch (Exception ex)
            {
                throw ex.Message;
            }
        }

 

写入内容到txt文件（可弹窗选择保存路径）：

　　　　　　//写入内容到txt文件：
                string savePath = "";
                SaveFileDialog savef = new SaveFileDialog();
                savef.Filter = "文本文件|*.txt";
                savef.FileName = DateTime.Now.ToString("yyyyMMddHHmmss");
                if (savef.ShowDialog() == DialogResult.OK)
                {
                    savePath = savef.FileName;
                }
                if (savePath != "")
                {
                    FileStream fs = new FileStream(savePath, FileMode.Create);
                    StreamWriter strWriter = new StreamWriter(fs, Encoding.Default);
                    DataTable dt = this.dgDetails.DataSource as DataTable;
                    foreach (DataRow row in dt.Rows)
                    {
                        string strData = "";
                        strData += row["条码"].ToString();
                        strData += "\r";
                        strWriter.WriteLine(strData);
                    }
                    strWriter.Close();
                    fs.Close();
                }