How to Exclude Properties from Automapper Mapping When Destination Properties Don't Exist?

Excluding Properties from Automapper Mapping

When using Automapper for object-to-object mapping, it's essential to exclude non-existent properties in the destination model. In your scenario, the 'ProductName' property in the OrderModel doesn't exist in the Orders database entity. Mapping this property will result in an exception.

Solution: Using Ignore()

To handle this situation, Automapper's Ignore() method allows you to specify specific properties that should not be mapped. Here's how you can use it:

Mapper.CreateMap<OrderModel, Orders>()
        .ForMember(x => x.ProductName, opt => opt.Ignore());

By adding the ForMember() expression with Ignore(), you instruct Automapper to disregard the 'ProductName' property during the mapping process. This will allow the mapping operation to proceed without triggering the exception.

Other Options

Automapper also provides alternative methods to exclude properties from mapping:

• Projection on Destination: This approach involves creating a custom mapping for the destination model and explicitly specifying the properties to include.
• Partial Matching: By default, Automapper uses exact property matching. You can disable this behavior and allow partial matching, mapping only the properties that exist in both source and destination models.

Remember, when excluding properties from Automapper mappings, ensure that your code handles the absence of those properties in the destination model.

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