How can I pass a byte value in c# function

Question

I have this function in c#:

public string CommitDocument(string extension, byte[] fileBytes)
{
   // some code here
}

I'm trying to call this function like this:

  CommitDocument("document.docx", byte [1493]);

I'm getting an error: "Invalid expression term 'byte'". How can I pass a value to the parameter of type byte?

You have to create, or receive an array of bytes, and then send it to the function. — Renato Afonso, Feb 09 '18 at 16:42

score 4 · Answer 1 · answered Feb 09 '18 at 16:36

4

The byte[] is an array of bytes and you need to allocate the array first with 'new'.

byte[] myArray = new byte[1493];
CommitDocument("document.docx", myArray);

answered Feb 09 '18 at 16:36

Andrew B

61
6

score -1 · Answer 2 · edited Feb 09 '18 at 16:40

-1

You defined CommitDocument as taking a byte array. A single byte is not convertible into a byte array. Or at least the Compiler is not doing that implicitly. There are a few ways around that limitation:

Provide a overload that takes a byte and makes it into a one element array:

public string CommitDocument(string extension, byte fileByte)
{
   //Make a one element arry from the byte
   var temp = new byte[1];
   temp[0] = fileByte;

   //Hand if of to the existing code.
   CommitDocument(extension, temp);
}

Otherwise turn fileBytes in a Params Parameter. You can provide any amount of comma seperated bytes to a Params, and the compiler will automagically turn them into an array. See Params Documentation for details and limits: https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/params

edited Feb 09 '18 at 16:40

Marco

2,007
17
28

answered Feb 09 '18 at 16:35

Christopher

9,634
2
17
31

Nevermind this. Andrew B found the real issue. – Christopher Feb 09 '18 at 16:38
@StephenKennedy: I know. I just can not exclude that there is some mistake in the question, wich could make my answer right again :) So I upvoted the one for Andrew and leave it around for some time. – Christopher Feb 09 '18 at 16:44
@StephenKennedy: As this is to make a code example, I opted for the simpler code. Also I prefer to write like this. It gives me better lines at debugging. And the normal and JiT Compiler can still cut it out in release builds. – Christopher Feb 09 '18 at 16:58
Thank you @Christopher! I appreciate your help! – IT Developer Feb 09 '18 at 17:58

How can I pass a byte value in c# function

2 Answers2