Install the StableDiffusion.NET-Nuget and at least one of the Backend-Packages.
If GPU-support is available it will prefer this over CPU.
If you want to add your own native-libraries or need more control over which backend to load, check the static Backends class.

Example

1. Create a model

stable diffusion:

using DiffusionModel model = ModelBuilder.StableDiffusion(@"<path to model")
                                         .WithVae(@"<optional path to vae>")
                                         .WithMultithreading()
                                         .Build();

flux:

using DiffusionModel model = ModelBuilder.Flux(@"<path to flux-model.gguf>",
                                               @"<path to clip_l.safetensors>",
                                               @"<path to t5xxl_fp16.safetensors>",
                                               @"<path to ae.safetensors>")
                                         .WithMultithreading()
                                         .Build();

2. create image

with default parameters:

IImage<ColorRGB> image = model.TextToImage("<prompt>");

with custom parameters:

IImage<ColorRGB> image = model.TextToImage("<prompt>", model.GetDefaultParameter().WithSeed(1234).WithSize(1344, 768));

3. (optional) save the image (requires System.Dawing or SkiaSharp extension)

File.WriteAllBytes("output.png", image.ToPng());

To process the resulting image further you can write your own extensions or install one of the HPPH-extension sets:
HPPH.System.Drawing
HPPH.SkiaSharp