Automapper 3.2.1：调用不明确，存在以下方法或属性

OwenDavies

0/5 (0投票)

2020年2月12日

CPOL

6126

为遇到相同问题的用户提供修复方案，问题与Automapper 3.2.1相关。

我刚刚在我的项目中将Automapper更新到3.2.1。然后我遇到了以下错误

调用不明确，存在以下方法或属性‘AutoMapper.IMemberConfigurationExpression.ResolveUsing (System.Func<MYASSEMBLY.MYCLASS1,object>)’和‘AutoMapper.IMemberConfigurationExpression.ResolveUsing (System.Func<AutoMapper.ResolutionResult,object>)’

Mapper.CreateMap<TaskCreated, Task>()  
.ForMember(x => x.Created, x => x.ResolveUsing(t => DateTime.UtcNow))  
.ForMember(x => x.Modified, x => x.ResolveUsing(t => DateTime.UtcNow))  
.ForMember(x => x.Deleted, x => x.Ignore());

快速搜索发现其他人也遇到了相同的问题。

https://github.com/AutoMapper/AutoMapper/issues/497

所以有两种选择。

使用MapFrom

Mapper.CreateMap<TaskCreated, Task>()
.ForMember(x => x.Created, x => x.MapFrom(t => DateTime.UtcNow))
.ForMember(x => x.Modified, x => x.MapFrom(t => DateTime.UtcNow))
.ForMember(x => x.Deleted, x => x.Ignore());

明确告诉Automapper我在lambda表达式中使用的是哪个对象

Mapper.CreateMap<TaskCreated, Task>()  
.ForMember(x => x.Created, x => x.ResolveUsing((TaskCreated t) => DateTime.UtcNow))  
.ForMember(x => x.Modified, x => x.ResolveUsing((TaskCreated t) => DateTime.UtcNow))
.ForMember(x => x.Deleted, x => x.Ignore());