so the situation is like this

I use sharp dx to create a swap chain that linked to the XAML element SwapchainPanel now

I have something rendered over it and then I try to grab rendered data into byte[] to place into an image buffer

for that, I use this function ReadBuffer

private D3D11.Texture2D OffscreenstagingTexture;
private D3D11.Texture2D GetTexture(D3D11.Device _Device,
D3D11.DeviceContext _Context,
D3D11.Texture2DDescription _Desc)
{
if (OffscreenstagingTexture == null ||
OffscreenstagingTexture.Description.Width != _Desc.Width ||
OffscreenstagingTexture.Description.Height != _Desc.Height)
{
RemoveAndDispose(ref OffscreenstagingTexture);
D3D11.Texture2DDescription _2DDesc = new D3D11.Texture2DDescription
{
Format = DXGI.Format.B8G8R8A8_UNorm,
Height = _Desc.Height,
Width = _Desc.Width,
SampleDescription = new DXGI.SampleDescription(1, 0),
ArraySize = _Desc.ArraySize,
BindFlags = D3D11.BindFlags.None,
CpuAccessFlags = D3D11.CpuAccessFlags.Read | D3D11.CpuAccessFlags.Write,
Usage = D3D11.ResourceUsage.Staging,
MipLevels = _Desc.MipLevels
};
OffscreenstagingTexture = ToDispose(new D3D11.Texture2D(_Device, _2DDesc));
}

return OffscreenstagingTexture;
}


public byte[] ReadBuffer(D3D11.Texture2D _2DTexture)
{
byte[] data = null;
D3D11.Texture2DDescription _Desc = _2DTexture.Description;
D3D11.Device _Device = _2DTexture.Device;
D3D11.DeviceContext _Context = _Device.ImmediateContext;
D3D11.Texture2D _2DMappedTexture = GetTexture(_Device, _Context, _Desc);
try
{
_Context.CopyResource(_2DTexture, _2DMappedTexture);
int size = _Desc.Width * _Desc.Height * 4;
DataBox box = _Context.MapSubresource(_2DMappedTexture, 0, 0, D3D11.MapMode.Read, D3D11.MapFlags.None, out DataStream stream);
data = ToByteArray(stream);
stream.Dispose();
}
catch (Exception)
{

}
return data;
}

private byte[] ToByteArray(Stream inputStream)
{
using (MemoryStream ms = new MemoryStream())
{
inputStream.CopyTo(ms);
return ms.ToArray();
}
}

now, on most the pc, it works fine but there are some pc where SwapChainPanle is returning bigger byte[] than expected

if I have 100 * 100 SwapChainPanel then the expected byte array size is 100 * 100 * 4 but it returns a bigger size array than that and because of that on some pc my app getting crashes

and I have checked this same crash at my dell Vostro 3558 also

and also if I use win2d to map this data to Image it results in zagged

Could it have something to do with the texture being a width with a multiple of 2? Is there a pitch parameter in the description of the texture?