Regression - Exception in System.Linq from NullableSourceMapper #2054
Description
Consider the following case:
int? Value -> IncorrectMapDest Value
Under AutoMapper 5.2.0 the above correctly failed to map, after upgrading to 6.0.2 the following exception in System.Linq is thrown:
System.ArgumentException with message "Argument types do not match"
at System.Linq.Expressions.Expression.Condition(Expression test, Expression ifTrue, Expression ifFalse)
at AutoMapper.Mappers.NullableSourceMapper.MapExpression(IConfigurationProvider configurationProvider, ProfileMap profileMap, PropertyMap propertyMap, Expression sourceExpression, Expression destExpression, Expression contextExpression)
at AutoMapper.Execution.TypeMapPlanBuilder.MapExpression(IConfigurationProvider configurationProvider, ProfileMap profileMap, TypePair typePair, Expression sourceParameter, Expression contextParameter, PropertyMap propertyMap, Expression destinationParameter)
at AutoMapper.Execution.TypeMapPlanBuilder.CreatePropertyMapFunc(PropertyMap propertyMap)
at AutoMapper.Execution.TypeMapPlanBuilder.TryPropertyMap(PropertyMap propertyMap)
at AutoMapper.Execution.TypeMapPlanBuilder.CreateAssignmentFunc(Expression destinationFunc, Boolean constructorMapping)
at AutoMapper.Execution.TypeMapPlanBuilder.CreateMapperLambda()
at AutoMapper.TypeMap.Seal(IConfigurationProvider configurationProvider)
at AutoMapper.MapperConfiguration.ResolveTypeMap(TypePair typePair)
at AutoMapper.MapperConfiguration.BuildExecutionPlan(MapRequest mapRequest)
at AutoMapper.MapperConfiguration.CreateMapperFuncs(MapRequest mapRequest)
at AutoMapper.LockingConcurrentDictionary`2.<>c__DisplayClass2_1.<.ctor>b__1()
at System.Lazy`1.CreateValue()
at System.Lazy`1.LazyInitValue()
at System.Lazy`1.get_Value()
at AutoMapper.MapperConfiguration.GetUntypedMapperFunc(MapRequest mapRequest)
at AutoMapper.Mapper.AutoMapper.IMapper.Map[TDestination](Object source)
Example:
void Main()
{
IMapper mapper = new Mapper(new MapperConfiguration(cfg =>
{
cfg.CreateMissingTypeMaps = true;
}));
var a = new A();
var b = mapper.Map<B>(a);
}
public class A
{
public int? Value { get; set; }
}
public class B
{
public SomeObject Value { get; set; }
}
public class SomeObject
{
public int Something { get; set; }
public SomeObject(string a)
{
}
}
Result (5.2.0)
AutoMapperMappingException: Error mapping types.
Mapping types:
A -> B
UserQuery+A -> UserQuery+B
Type Map configuration:
A -> B
UserQuery+A -> UserQuery+B
Property:
Value
Result (6.0.2)
Argument types do not match