asp.net core中
0
悬赏园豆：30
[已关闭问题]
关闭于 2018-09-27 17:20
项目在正式环境运行一段时间之后
就会报下面类似问题
Unable to cast object of type 'lm.Erp.Contracts.Dto.ResultDto' to type 'lm.Erp.Contracts.Dto.PaginationResultDto1[lm.Erp.Contracts.Dto.KeyValueDto2[System.Int64,System.Int32]]'.,
Unable to cast object of type 'lm.Erp.Contracts.Dto.ResultDto' to type 'lm.Erp.Contracts.Dto.ResultDto`1[lm.Erp.Contracts.Dto.Sys.LoginUserDto]'.,
使用的了AutoMapper、Dapper
一开始，或者每次项目重启都没问题，抛出以上类似问题，都是在项目运行一段时间之后
所有回答(1)
0
1、asp.net core2.0中 使用AutoMapper 6.2.2，AutoMapper.Extensions.Microsoft.DependencyInjection 3.2.0
2、在Startuup.cs中 ConfigureServices(IServiceCollection services) 方法中注册:services.AddAutoMapper()
3、新建MappingProfile类 继承Profile
public class MappingProfile : Profile
{
public MappingProfile()
{
CreateMap<PaginationResultModel<SysUserModel>, PaginationResultDto<SysUserDto>>(); //例如
}
}
4、直接Mapper.Map<TSource, TDest>(s)使用了
对于list中list类，一定要第三布的CreateMap
题外话：这是自己封装的automapper，不嫌弃可以拿去用
public class AutoMapHelper
{
public static List<TDest> Map<TSource, TDest>(List<TSource> sl, Func<TDest, TDest> func = null)
{
var list = new List<TDest>();
if (null == sl)
{
return list;
}
foreach (var item in sl)
{
var info = Mapper.Instance.Map<TSource, TDest>(item);
if (func != null)
{
info = func(info);
}
list.Add(info);
}
return list;
}
public static IList<TDest> Map<TSource, TDest>(IList<TSource> sl, Func<TDest, TDest> func = null)
{
var list = new Collection<TDest>();
if (null == sl)
{
return list;
}
foreach (var item in sl)
{
var info = Mapper.Instance.Map<TSource, TDest>(item);
if (func != null)
{
info = func(info);
}
list.Add(info);
}
return list;
}
public static IList<TDest> Map<TSource, TDest>(IList<TSource> sl, Action<TSource, TDest> action)
{
var list = new Collection<TDest>();
if (null == sl)
{
return list;
}
foreach (var item in sl)
{
var info = Mapper.Instance.Map<TSource, TDest>(item);
action?.Invoke(item, info);
list.Add(info);
}
return list;
}
public static List<TDest> Map<TSource, TDest>(List<TSource> s1, Action<TSource, TDest> action)
{
var list = new List<TDest>();
if (null == s1)
{
return list;
}
foreach (var item in s1)
{
var info = Mapper.Instance.Map<TSource, TDest>(item);
action?.Invoke(item, info);
list.Add(info);
}
return list;
}
public static TDest Map<TSource, TDest>(TSource s)
{
return Map<TSource, TDest>(s, null);
}
public static TDest Map<TSource, TDest>(TSource s, Action<TSource, TDest> action)
{
try
{
var result = Mapper.Map<TSource, TDest>(s);
action?.Invoke(s, result);
return result;
}
catch (Exception ex)
{
var t = ex.Message;
var result = Mapper.Map<TSource, TDest>(s);
action?.Invoke(s, result);
return result;
}
}
}