移除 ReverseMap() ，然后尝试使用 AutoMapper 条件映射 并使用 ForPath 而不是 ForMember 嵌套子对象属性:

Remove ReverseMap() ,then try to use AutoMapper Conditional Mapping and use ForPath instead of ForMember for nested child object properties:

CreateMap<SomeEntityViewModel, SomeEntity>()
    .ForPath(
            m => m.NestedObject.StringValue, 
            opt => {                         
                     opt.Condition(
                        s => s.DestinationMember != null && s.DestinationMember != "" 
                     );
                     opt.MapFrom(s => s.NestedObjectStringValue);
                   }
            );

同IntValue.

更新

因此，如果 NestedObject 为空，您不想将 SomeEntityViewModel 中的值映射到它.如果 NestedObject 不为空，则映射有效.

So, if the NestedObject is null, you do not want to to map the value from SomeEntityViewModel to it. If the NestedObject is not null,mapping works.

请参考下面使用AfterMap

CreateMap<SomeEntityViewModel, SomeEntity>()
             .ForMember(q => q.NestedObject, option => option.Ignore())
             .AfterMap((src, dst) => {
                     if(dst.NestedObject != null)
                     {
                     dst.NestedObject.StringValue = src.NestedObjectStringValue;
                     }

                 });