Object reference not set to an instance of an object (byte[]

Dealy

10y4.6kVisual Basic .NET

Hello,

I have the following code:

public byte[] getFile(FileUpload file)
{
byte[] bytes=null;
using (Stream fs = file.PostedFile.InputStream)
{
using (BinaryReader br = new BinaryReader(fs))
{
bytes = br.ReadBytes((Int32)fs.Length);
}
}
return bytes;
}

When I compile the procedure I get the following error message: "Object reference not set to an instance of an object."

Any idea how to fix the error?

Thank you in advance.

8 Replies

Know the answer? Post it — somebody with the same question will find it here.

Joginder Banger10y ago
Accepted answer
HI dealy,
// CHECK FILE PARAMETERS HAVE DATA.
using(Streamfs=file.PostedFile.InputStream)
{
}
if(file!=null)
{
using(Stream fs=file.PostedFile.Inputstream)
{
// another code here
}
}
}
Bhushan Gawale10y ago
Error seems to be generated while accessing property or method of null valued object
safest implementation would be something like this
publicbyte[]getFile(FileUploadfile)
{
byte[]bytes=null;
if(file!=null&&file.PostedFile!=null&&file.PostedFile.InputStream!=null)
{
using(Streamfs=file.PostedFile.InputStream)
{
if(fs!=null)
{
using(BinaryReaderbr=newBinaryReader(fs))
{
if(br!=null)
{
bytes=br.ReadBytes((Int32)fs.Length);
}
}
}
}
returnbytes;
}
}
Dealy10y ago
Thank you all for your answers, it was an error message because of null.
I changed my code to the following:
publicbyte[]getFile(FileUploadfile)
{
byte[]bytes=null;
if(file.HasFile==true)
{
using(Streamfs=file.PostedFile.InputStream)
{
using(BinaryReaderbr=newBinaryReader(fs))
{
bytes=br.ReadBytes((Int32)fs.Length);
}
}
}
returnbytes;
}
Manas Mohapatra10y ago
Make sure that FileUpload variable is not null.

if(file != null)
{
// Implement your logic
}

If file variable is null and you are trying to get PostedFile, it throws you exception.
Joginder Banger10y ago
```
byte[] bytes = System.IO.File.ReadAllBytes(filename);
```
for more information hit like
http://stackoverflow.com/questions/1497997/c-reliable-way-to-convert-a-file-to-a-byte
Bikesh Srivastava10y ago
Hi Dealy,
"Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.NullReferenceException: Object reference not set to an instance of an object"
=>Use debug in your code and find in which line you are getting null value,because this error due to null value.
Rajeev Punhani10y ago
Hi Dealy,
Please tryinitializingand tell where exactly you are getting error.
byte[]bytes=newbyte[file.InputStream.Length];
Dealy10y ago
Thank you for your answer but I'm still getting the same error message.