How to Ignore Properties During AutoMapper Mappings?

Ignoring Properties in Automapper Mappings

When working with Automapper, it can be necessary to exclude certain properties from mapping between source and destination objects. This can occur when the destination object contains read-only or calculated properties that would not be suitable for mapping from the source.

One such scenario is where the source object (e.g., OrderModel) has a property (ProductName) that is not present in the destination object (e.g., Orders). Attempting to perform the mapping with:

Mapper.CreateMap<OrderModel, Orders>();

Will result in an exception indicating that the ProductName property is unmapped.

To prevent Automapper from attempting to map the ProductName property, use the Ignore() method:

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

Alternatively, in AutoMapper versions after 8.0, the Ignore() method has been replaced with DoNotValidate():

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

By specifying the Ignore() or DoNotValidate() option, Automapper will exclude the ProductName property from the mapping process, resolving the exception and allowing the mapping to proceed successfully.

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