文件，二进制流 互转

 二进制转为文件 

 FileStream fStream = new FileStream(filePath + fileName, FileMode.Create, FileAccess.Write); fStream.Write(file, 0, file.Length); fStream.Close(); fStream.Dispose();

文件转为二进制 

 FileStream fs = new FileStream(localFilePath, FileMode.Open, FileAccess.Read); Byte[] file = new Byte[fs.Length]; fs.Read(file, 0, file.Length); fs.Close(); fs.Dispose();