How to find out is bytes array has any data or it is newly created bytes array?
var Buffer = new byte[1000];
//How to find out is Buffer is empty or not?
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Isn't there a function like Buffer.isEmpty()?Rasel– Rasel2011-06-30 09:25:06 +00:00Commented Jun 30, 2011 at 9:25
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what do you mean by empty ? full of zero ?Steve B– Steve B2011-06-30 09:25:56 +00:00Commented Jun 30, 2011 at 9:25
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c# do not provide such function.Tomas– Tomas2011-06-30 09:26:11 +00:00Commented Jun 30, 2011 at 9:26
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Buffer is not a keyword under System? we can declare keyword as variable?V-SHY– V-SHY2014-03-07 04:34:40 +00:00Commented Mar 7, 2014 at 4:34
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3 Answers
I assume by 'empty' you mean containing default values for every byte element, if this isn't what you mean, look at @sehe's answer.
How about using LINQ to check whether all elements have the default value for the type:
var Empty = Buffer.All(B => B == default(Byte));
4 Comments
sehe
default(T) would only have a meaning in the context of a template, IIRC
Jon Skeet
@sehe: Nope, it's a perfectly valid operator regardless of generics.
Robula
The
.All() method on System.Buffer does not exist. Even if I include System.Linq.
George Duckett
@Robula I'm referring to the buffer variable in the question, rather than system.buffer
A byte is a valuetype, it cannot be null;
Creating an array immediately initializes the elements to the default value for the element type.
This means, empty cells can't exist, let alone be detected.
If you must:
use nullable types
var Buffer = new byte?[1000];use Array.Resize when capacity changes. However, you could soon be in a situation where just using a System.Collections.Generic.List would be much more efficient
Comments
In addition to the answers given
var buffer = new byte[1000];
var bFree = true;
foreach (var b in buffer)
{
if (b == default(byte)) continue;
bFree = false;
break;
}
