我最近改变了如何让用户在我的网站上输入日期。它曾经是一个文本框,他们输入它,但收到反馈后,似乎人们更愿意有3个下降作为DD MM YYYY。我已经使用我在SO上找到的一些代码将其添加到我的网站中。
为了实现它,我必须创建一个类来解决无效数据验证,我的类看起来像这样
public class DateSelector : ICustomMappings {
public DateSelector() : this(System.DateTime.MinValue) { }
public DateSelector(DateTime date) {
Year = date.Year;
Month = date.Month;
Day = date.Day;
}
[Required]
public int Year { get; set; }
[Required, Range(1, 12)]
public int Month { get; set; }
[Required, Range(1, 31)]
public int Day { get; set; }
public DateTime? DateTime {
get {
DateTime date;
if (!System.DateTime.TryParseExact(string.Format("{0}/{1}/{2}", Year, Month, Day), "yyyy/M/d", CultureInfo.InvariantCulture, DateTimeStyles.None, out date))
return null;
else
return date;
}
}
public void CreateMappings(IConfiguration configuration) {
configuration.CreateMap<DateTime, DateSelector>()
.ForMember(dest=>dest.DateTime,opt=>opt.Ignore())
.ForMember(dest => dest.Day, opt => opt.MapFrom(src => src.Day))
.ForMember(dest => dest.Month, opt => opt.MapFrom(src => src.Month))
.ForMember(dest => dest.Year, opt => opt.MapFrom(src => src.Year));
}
}
当Automapper是一个文本框时效果很好,但现在我把它分成了下拉列表,我得到了以下错误。
没有为类型'System.DateTime'和'System.Object'定义二元运算符NotEqual。
我想我得到它是因为它试图将DateTime映射到我的班级,我该如何解决这个问题?
编辑: 这是我的控制器,它调用一个方法从我的数据库中获取数据,然后使用扩展方法.Project()
public ActionResult EditYoungPerson(int youngPersonId) {
YoungPerson.EditYoungPersonViewModel editYoungPersonViewModel = new YoungPerson.EditYoungPersonViewModel();
editYoungPersonViewModel.YoungPerson = Context.GetYoungPersonDetailsForYoungPersonId(youngPersonId).Project().To<YoungPerson._YoungPersonViewModel>().Single();
return View(editYoungPersonViewModel);
}
这是堆栈跟踪
[InvalidOperationException: The binary operator NotEqual is not defined for the types 'System.DateTime' and 'System.Object'.]
System.Linq.Expressions.Expression.GetEqualityComparisonOperator(ExpressionType binaryType, String opName, Expression left, Expression right, Boolean liftToNull) +4026223
System.Linq.Expressions.Expression.NotEqual(Expression left, Expression right) +73
AutoMapper.QueryableExtensions.Extensions.BindMappedTypeExpression(IMappingEngine mappingEngine, PropertyMap propertyMap, ExpressionResolutionResult result, MemberInfo destinationMember, IDictionary`2 typePairCount) +268
AutoMapper.QueryableExtensions.Extensions.CreateMemberBindings(IMappingEngine mappingEngine, TypePair typePair, TypeMap typeMap, Expression instanceParameter, IDictionary`2 typePairCount) +1477
AutoMapper.QueryableExtensions.Extensions.CreateMapExpression(IMappingEngine mappingEngine, TypePair typePair, Expression instanceParameter, IDictionary`2 typePairCount) +363
AutoMapper.QueryableExtensions.Extensions.CreateMapExpression(IMappingEngine mappingEngine, TypePair typePair, IDictionary`2 typePairCount) +119
AutoMapper.QueryableExtensions.<>c__DisplayClass1`2.<CreateMapExpression>b__0(TypePair tp) +119
System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory) +85
AutoMapper.Internal.ConcurrentDictionaryImpl`2.GetOrAdd(TKey key, Func`2 valueFactory) +67
AutoMapper.QueryableExtensions.Extensions.CreateMapExpression(IMappingEngine mappingEngine) +322
AutoMapper.QueryableExtensions.ProjectionExpression`1.To() +111
Portal.Controllers.YoungPersonController.EditYoungPerson(Int32 youngPersonId) in c:\tfs\Portal\Dev\Portal.UI\Controllers\YoungPersonController.cs:278
lambda_method(Closure , ControllerBase , Object[] ) +161
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +208
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +28
System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +57
System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +223
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +48
System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +24
System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +102
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +57
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +43
System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +14
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +57
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +47
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__3(IAsyncResult asyncResult) +25
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +23
System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +47
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9651116
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
编辑:我错过了使用DataSelector类的ViewModel。
public class _YoungPersonViewModel ICustomMappings {
public int YoungPersonId { get; set; }
public string FirstName { get; set; }
public string Surname { get; set; }
public string FullName { get { return FirstName + " " + Surname; } }
public DateSelector DateOfBirth { get; set; }
public IEnumerable<SelectListItem> GenderTypeList { get; set; }
public void CreateMappings(IConfiguration configuration) {
configuration.CreateMap<Entities.Models.YoungPerson, _YoungPersonViewModel>()
.ForMember(dest => dest.DateOfBirth, opt=>opt.MapFrom(src=>src.DateOfBirth));
}
}
答案 0 :(得分:1)
尝试使用ProjectUsing:
configuration.CreateMap<DateTime, DateSelector>()
. ProjectUsing(src => new DateSelector(src));