Error when resizing window

[KangUnia]

First of all I am using this library very gratefully.
I am testing directx using winui3 swapchain.

However, when resizing the window, Device.CreateRenderTargetView throws an error. [COM object that has been separated from its underlying RCW cannot be used.
]

I don't understand this error, so I can't fix it.

please help ........

public void Resize(uint width, uint height)
{
mDeviceContext.Object.OMSetRenderTargets(0, null, null);
mDeviceContext.Object.Flush();
mRenderTargetView.Dispose();
mRenderTargetView = null;

var hResult = mSwapChain.Object.ResizeBuffers(0, width, height, DXGI_FORMAT.DXGI_FORMAT_UNKNOWN, 0);

var frameBuffer = mSwapChain.GetBuffer<ID3D11Texture2D>(0);
mRenderTargetView = mDevice.CreateRenderTargetView(frameBuffer);

...
}

[KangUnia]

use ComObject new device

[stephensheehy]

For reference by those who come after us:

I had the same issue but for me creating a new device was not an option*, nor was it necessary... In my case the error was allowing the IDXGIDevice1 I used to create my swap chain to get cleaned by the garbage collector so all I had to do was hold a reference to it.

Something like the following code works just fine:

public class WindowsCanvas : SwapChainPanel
{
    // some of these are members because they are reused and passed around
    // some (dxgiDevice) just need to persist in memory to sustain valid device state
    private IComObject<ID3D11Device>            dxDevice;
    private IComObject<IDXGIDevice1>            dxgiDevice;
    private IComObject<ID3D11DeviceContext>     dxDeviceContext;
    private IComObject<IDXGISwapChain1>         dxSwapChain;
    private IComObject<ID3D11RenderTargetView>  dxRenderTargetView;
    private IComObject<ID3D11DepthStencilView>  dxDepthStencilView;
    
    void ResizeCanvas()
    {
        dxDeviceContext.Object.OMSetRenderTargets(0, null, null);
        dxRenderTargetView?.Dispose();
        dxRenderTargetView = null;
        dxDepthStencilView?.Dispose();
        dxDepthStencilView = null;

        var width = (int)Math.Ceiling(this.ActualWidth);
        var height = (int)Math.Ceiling(this.ActualHeight);
        width = width <= 0 ? 0 : width;
        height = height <= 0 ? 0 : height;

        dxSwapChain.ResizeBuffers(2, (uint)width, (uint)height, DXGI_FORMAT.DXGI_FORMAT_B8G8R8A8_UNORM, 0);

        var framebufferTexture = dxSwapChain.GetBuffer<ID3D11Texture2D>(0);
        var framebufferDesc = new D3D11_RENDER_TARGET_VIEW_DESC
        {
            Format = DXGI_FORMAT.DXGI_FORMAT_B8G8R8A8_UNORM_SRGB,
            ViewDimension = D3D11_RTV_DIMENSION.D3D11_RTV_DIMENSION_TEXTURE2D
        };

        dxRenderTargetView = dxDevice.CreateRenderTargetView(framebufferTexture, framebufferDesc);

        var framebufferDepthDesc = framebufferTexture.GetDesc();
        framebufferTexture?.Dispose();

        framebufferDepthDesc.Format = DXGI_FORMAT.DXGI_FORMAT_D24_UNORM_S8_UINT;
        framebufferDepthDesc.BindFlags = (uint)D3D11_BIND_FLAG.D3D11_BIND_DEPTH_STENCIL;
        var framebufferDepthTexture = dxDevice.CreateTexture2D<ID3D11Texture2D>(framebufferDepthDesc);
        
        dxDepthStencilView = dxDevice.CreateDepthStencilView(framebufferDepthTexture);
        
        framebufferDepthTexture?.Dispose();
    }
}

• Creating a new device is in itself inefficient but in addition I have already passed the device to a native c++ library and swapping it out will cause a number of other issues.