复制代码 代码如下:

//把txt清空

FileStream stream = File.Open(Adr,FileMode.OpenOrCreate,FileAccess.Write);

stream.Seek(0, SeekOrigin.Begin);

stream.SetLength(0);

stream.Close();

//向txt里面追加信息

StreamWriter sw = new StreamWriter(Adr,true,Encoding.GetEncoding("gb2312"));

sw.WriteLine(str);

sw.Flush();

sw.Close();