Use the YOLO v4 and v5 (ONNX) models for object detection in C# using ML.Net
MIT License
See here for YOLO v3 use.
Use YOLO v5 with ML.Net
Thanks to raulsf6, deanbennettdeveloper and keesschollaart81
Use YOLO v4 with ML.Net
Onnx model available in the onnx/models repos here.
Also check https://github.com/dotnet/machinelearning/issues/5466