The instance of entity type 'Product' cannot be tracked because another instance with the same key value is already being tracked

Question

I made a test with code below to update the Product:

var existing = await _productRepository.FirstOrDefaultAsync(c => c.Id == input.Id);
if (         


        

Answer 1

Check the value of updatedEntity.Id, if it's zero then use the below code.

var updatedEntity = ObjectMapper.Map(input);
updatedEntity.Id = input.Id; //set Id manually
var entity = await _productRepository.UpdateAsync(updatedEntity);