Map Conditional Field Notice For Free

Conditional Field Mapping allows you to control whether or not a value or field is written to a target datastore based on the contents of the source data. For example, if there is a NULL value in a source field, you can choose to overwrite target data with the NULL value or skip that field when updating a record.

As we know, if the data property name is different for source and destination classes, the AutoMapper in C# can't map those properties by default. However, using the ForMember option, we can map between the properties of different names.

The difference is that it runs sooner in the mapping process, before the source value is resolved (think MapFrom). So the precondition is called, then we decide which will be the source of the mapping (resolving), then the condition is called and finally the destination value is assigned.

So, the AutoMapper Ignore() method is used when you want to completely ignore the property in the mapping. The ignored method could be in either the source or the destination object.

Conditional Field Mapping allows you to control whether or not a value or field is written to a target datastore based on the contents of the source data. For example, if there is a NULL value in a source field, you can choose to overwrite target data with the NULL value or skip that field when updating a record.

As we know, if the data property name is different for source and destination classes, the AutoMapper in C# can't map those properties by default. However, using the ForMember option, we can map between the properties of different names.

The difference is that it runs sooner in the mapping process, before the source value is resolved (think MapFrom). So the precondition is called, then we decide which will be the source of the mapping (resolving), then the condition is called and finally the destination value is assigned.