.NET中物理文件与byte[]的相互转换

• 物理文件转byte[]

string newFileName = "...xxx.ppt";
using(FileStream fileStream = new FileStream(newFileName,FileMode.Open,FileAccess.Read)){
    byte[] byteArray = new byte[fileStream.Length];
    fileStream.Read(byteArray,0,byteArray.Length);
    Console.WriteLine(byteArray);
}

• byte[]转物理文件

string newFileName = "...xxx.ppt";
using (FileStream fileStream = new FileStream(newFileName, FileMode.Create, FileAccess.Write))
{
    fileStream.Write(item.Content, 0, item.Content.Length);
}