System.ArgumentException: source and destination length must be the same

Unity Engine
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1 
System.ArgumentException: source and destination length must be the same

This error does not consider the use of ArrayPool

var narr = new NativeArray<byte>(16, Allocator.Temp);
var parr = ArrayPool<byte>.Shared.Rent(16);

narr.CopyTo(parr);
2

You should check the array size, Rent() can also return larger arrays, the parameter is just the minimum size.

3

So different lengths should be allowed，this is why this post exists

4

From the documentation:

So it does what it should and it’s not a bug.

Edit:

try out the static version NativeArray.Copy() here there are several overloads with length parameter.

5 
NativeArray<byte>.Copy()

Is ok

8399364--1108899--upload_2022-8-29_22-33-59.png
I can’t see the description here

But there is no reason to limit the same length

8399364--1108902--upload_2022-8-29_22-35-9.png
8399364--1108902--upload_2022-8-29_22-35-9.png940×808 27.3 KB

6

You’re looking at the wrong method. The one you’re using is NativeArray.CopyTo. It’s defined here and in turn uses the versions here. Those versions expect equal lengths.

7

I didn’t mean NativeArray.CopyTo = Span.CopyTo
I mean NativeArray.CopyTo should behave like Span.CopyTo