读写txt

FileStream fileStr = new FileStream("shaftCofig.txt", FileMode.OpenOrCreate);
StreamReader strReader = new StreamReader(fileStr, UnicodeEncoding.GetEncoding("GB2312"));
string data = string.Empty;
string shaftStr = "";
while ((data = strReader.ReadLine()) != null)
{
    //shaftStr = shaftStr+ data + "\r\n";
}
fileStr.Close();

FileStream fileStr = new FileStream("shaftCofig.txt", FileMode.Create);
StreamWriter writer = new StreamWriter(fileStr, UnicodeEncoding.GetEncoding("GB2312"));

writer.WriteLine(aa);
writer.Close();