c#文件转化byte数组

 1   public static byte[] ReadFile(string fileName)
 2         {
 3             if (!File.Exists(fileName))
 4             {
 5                 throw new Exception("文件为空");
 6             }
 7 
 8             byte[] pReadByte = new byte[0];
 9             try
10             {
11                 using (FileStream pFileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read))
12                 {
13                     BinaryReader r = new BinaryReader(pFileStream);
14 
15                     r.BaseStream.Seek(0, SeekOrigin.Begin);    //将文件指针设置到文件开
16 
17                     pReadByte = r.ReadBytes((int)r.BaseStream.Length);
18 
19                     return pReadByte;
20                 }
21 
22             }
23 
24             catch
25             {
26 
27                 return pReadByte;
28 
29             }
30 
31         }