使用自动映射程序转换两个IEnumerables来给出默认值

using AutoMapper;
using System.Collections.Generic;

IEnumerable<SourceObject> sourceList = GetSourceList();
IEnumerable<DestinationObject> destinationList = GetDestinationList();

var config = new MapperConfiguration(cfg =>
{
    cfg.CreateMap<SourceObject, DestinationObject>();
});

var mapper = new Mapper(config);
IEnumerable<DestinationObject> mappedList = mapper.Map<IEnumerable<DestinationObject>>(sourceList);

if (mappedList != null && mappedList.Any())
{
    // 映射成功，使用转换后的目标对象列表
    ProcessMappedList(mappedList);
}
else
{
    // 映射失败或源对象为空，使用默认值
    ProcessDefaultList();
}