C# IO读写文件方法封装

        /// <summary>
        /// 功能：FileStream文件流读取文件
        /// </summary>
        /// <param name="filePath">参数：文件路径</param>
        /// <returns>返回值：StreamReader对象</returns>
        public static StreamReader ReadFileByFs(string filePath)
        {
            FileStream Fs = null;
            StreamReader Sr = null;
            try
            {
                Fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Read);
                Sr = new StreamReader(Fs, Encoding.Default);
            }
            catch (IOException e)
            {
                throw e;
            }
            return Sr;
        }

       /// <summary>
        /// 功能：FileStream文件流写文件
        /// </summary>
        /// <param name="filePath">参数：文件路径</param>
        /// <returns>返回值：StreamWriter对象</returns>
        public static StreamWriter WriteFileByFs(string filePath)
        {
            FileStream Fs = null;
            StreamWriter Sw = null;
            try
            {
                Fs = new FileStream(filePath, FileMode.OpenOrCreate, FileAccess.Write);
                Sw = new StreamWriter(Fs, Encoding.Default);
            }
            catch (IOException e)
            {
                throw e;
            }
            return Sw;
        }