C#读取文本数据（按行读取）

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            StreamReader sr = new StreamReader(path, Encoding.Default);  //path为文件路径
            String line;
            while ((line = sr.ReadLine()) != null)//按行读取 line为每行的数据
            {
                if (line.Contains("GPGGA") || line.Contains("GPVTG"))
                {
                    sw.WriteLine(line); //写入--
                }
            }