如何查找支持的 Direct3D 功能级别

我想出了这个：

C++ DLL：

#include "pch.h"
#include <wrl.h>
#include <d3d11_2.h> 
#include "BKGraphicsDLL.h"

using Microsoft::WRL::ComPtr;

extern "C"
{
    __declspec(dllexport) D3D_FEATURE_LEVEL GetGraphicsFeatureLevel()
    {
        HRESULT hr = E_FAIL;
        D3D_FEATURE_LEVEL MaxSupportedFeatureLevel = D3D_FEATURE_LEVEL_9_1;
        D3D_FEATURE_LEVEL FeatureLevels[] = {
            D3D_FEATURE_LEVEL_11_1,
            D3D_FEATURE_LEVEL_11_0,
            D3D_FEATURE_LEVEL_10_1,
            D3D_FEATURE_LEVEL_10_0,
            D3D_FEATURE_LEVEL_9_3,
            D3D_FEATURE_LEVEL_9_2,
            D3D_FEATURE_LEVEL_9_1
        };

        hr = D3D11CreateDevice(
            NULL,
            D3D_DRIVER_TYPE_HARDWARE,
            NULL,
            0,
            FeatureLevels,
            ARRAYSIZE(FeatureLevels),
            D3D11_SDK_VERSION,
            NULL,
            &MaxSupportedFeatureLevel,
            NULL
        );

        return MaxSupportedFeatureLevel;
    }
}

一个枚举和一个 NativeMethods 类来访问我的 MainPage C# 中的 DLL：

    public enum D3DFeatureLevel
    {
        D3D_FEATURE_LEVEL_9_1 = 0x9100,
        D3D_FEATURE_LEVEL_9_2 = 0x9200,
        D3D_FEATURE_LEVEL_9_3 = 0x9300,
        D3D_FEATURE_LEVEL_10_0 = 0xa000,
        D3D_FEATURE_LEVEL_10_1 = 0xa100,
        D3D_FEATURE_LEVEL_11_0 = 0xb000,
        D3D_FEATURE_LEVEL_11_1 = 0xb100,
        D3D_FEATURE_LEVEL_12_0 = 0xc000,
        D3D_FEATURE_LEVEL_12_1 = 0xc100
    };


    // used to get Graphics capabilities
    internal static class NativeMethods
    {
        [DllImport("BKGraphicsDLL.dll", ExactSpelling = true)]
        public static extern D3DFeatureLevel GetGraphicsFeatureLevel();

    }

无论我需要在代码中的何处设置功能级别，都使用以下行：

    D3DFeatureLevel maxFeatureLevel = NativeMethods.GetGraphicsFeatureLevel();