「指定されたキャストは無効です」という例外をときどきスローし始めたアプリケーションがあります。このエラーを一貫して再現することはできず、それが私と私のユーザーを夢中にさせています。
問題のあるコード：
public Complaint GetComplaintById(int Id)
{
Complaint complaint = (from c in _context.cts_complaints
join ud in _context.cts_user_details on c.CreatedBy equals ud.UserId
where c.Id == Id
select new Complaint
{
Id = c.Id,
CompanyId = c.CompanyId,
ComplaintTypeId = c.ComplaintTypeId,
CategoryId = c.CategoryId,
ReportCategoryId = c.ReportCategoryId,
ParentId = c.ParentId,
LanguageId = c.LanguageId,
AreaId = c.AreaId,
Title = c.Title,
Description = c.Description,
ResponseDue = c.ResponseDue,
DateReceived = c.DateReceived,
FPSCNumber = c.FPSCNumber,
FPSCRepresentative = c.FPSCRepresentative,
ContactMethodId = c.ContactMethodId,
ContactedBy = c.ContactedBy,
CreatedDate = c.CreatedDate,
CreatedBy = c.CreatedBy,
CreatedByName = ud.Name,
Status = c.Status,
AttachmentsArchived = c.AttachmentsArchived,
Timestamp = c.Timestamp,
}).FirstOrDefault();
complaint.Users = this.GetUsersByComplaintId(Id);
return complaint;
}
スタックトレース：
Specified cast is not valid.
at System.Data.Linq.SqlClient.SqlProvider.Execute(Expression query, QueryInfo queryInfo, IObjectReaderFactory factory, Object[] parentArgs, Object[] userArgs, ICompiledSubQuery[] subQueries, Object lastResult)
at System.Data.Linq.SqlClient.SqlProvider.ExecuteAll(Expression query, QueryInfo[] queryInfos, IObjectReaderFactory factory, Object[] userArguments, ICompiledSubQuery[] subQueries)
at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
at System.Data.Linq.DataQuery`1.System.Linq.IQueryProvider.Execute[S](Expression expression)
at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
at ComplaintTracking.Business.Data.SqlComplaintRepository.GetComplaintById(Int32 Id) in C:\SourceCode2010\ComplaintTracking\Service Pack\1.0 ComplaintTracking\ComplaintTracking.Business\Data\SqlComplaintRepository.cs:line 20
at ComplaintTracking.Business.Managers.ComplaintManager.GetComplaintById(Int32 Id) in C:\SourceCode2010\ComplaintTracking\Service Pack\1.0 ComplaintTracking\ComplaintTracking.Business\Managers\ComplaintManager.cs:line 33
at ComplaintTracking.Web.UserControls.ComplaintViews.ResolveViewPresenter.Init() in C:\SourceCode2010\ComplaintTracking\Service Pack\1.0 ComplaintTracking\ComplaintTracking.Web\UserControls\ComplaintViews\ResolveViewPresenter.cs:line 39
at ComplaintTracking.Web.Library.BaseUserControl`2.OnLoad(EventArgs e) in C:\SourceCode2010\ComplaintTracking\Service Pack\1.0 ComplaintTracking\ComplaintTracking.Web\Library\BaseUserControl.cs:line 56
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
更新： リポジトリパターンを利用しようとしています。cts_complaintsというLINQ2SQL ORMオブジェクトがあります。これは、SQLServerテーブルdbo.cts_complaintsからの1-1マッピングです。私のアプリケーションには、Complaintというモデルがあります。私のリポジトリはcts_complaintsからComplaintにマッピングしています。
[HasSelfValidation]
public class Complaint
{
public Complaint()
{
CreatedBy = System.Threading.Thread.CurrentPrincipal.Identity.Name;
CreatedDate = DateTime.Now;
DateReceived = DateTime.Now;
Users = new List<ComplaintUser>();
}
public int Id { get; internal set; }
public int CompanyId { get; set; }
public int ComplaintTypeId { get; set; }
public int CategoryId { get; set; }
public int ReportCategoryId { get; internal set; }
public int? ParentId { get; set; }
public int LanguageId { get; set; }
public int? AreaId { get; set; }
public string Title { get; set; }
public string Description { get; set; }
public DateTime ResponseDue { get; set; }
public DateTime DateReceived { get; set; }
public string FPSCNumber { get; set; }
public string FPSCRepresentative { get; set; }
public int ContactMethodId { get; set; }
public string ContactedBy { get; set; }
public int Status { get; set; }
public bool AttachmentsArchived { get; set; }
public DateTime CreatedDate { get; internal set; }
public string CreatedBy { get; internal set; }
public string CreatedByName { get; set; }
public byte[] Timestamp { get; internal set; }
public List<ComplaintUser> Users { get; internal set; }
[SelfValidation()]
public void ValidateUsers(ValidationResults results)
{
//if id is 0 it's new. There must be user
if (Users.Count==0)
results.AddResult(new ValidationResult("You must assign at least one user.", this, "Users", "", null));
}
}
cts_complaints：
CREATE TABLE [dbo].[cts_complaint](
[Id] [int] IDENTITY(1,1) NOT NULL,
[CompanyId] [int] NOT NULL,
[ComplaintTypeId] [int] NOT NULL,
[CategoryId] [int] NOT NULL,
[ReportCategoryId] [int] NOT NULL,
[ParentId] [int] NULL,
[LanguageId] [int] NOT NULL,
[AreaId] [int] NULL,
[Title] [nvarchar](50) NOT NULL,
[Description] [nvarchar](max) NOT NULL,
[ResponseDue] [datetime] NOT NULL,
[DateReceived] [datetime] NOT NULL,
[FPSCNumber] [nvarchar](50) NOT NULL,
[FPSCRepresentative] [nvarchar](50) NOT NULL,
[ContactMethodId] [int] NOT NULL,
[ContactedBy] [nvarchar](50) NOT NULL,
[CreatedDate] [datetime] NOT NULL,
[CreatedBy] [nvarchar](50) NOT NULL,
[Status] [int] NOT NULL,
[AttachmentsArchived] [bit] NOT NULL,
[Timestamp] [timestamp] NOT NULL,
CONSTRAINT [PK_cts_complaint] PRIMARY KEY CLUSTERED
(
[Id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
cts_user_details：
CREATE TABLE [dbo].[cts_user_detail](
[UserId] [nvarchar](50) NOT NULL,
[Name] [nvarchar](50) NOT NULL,
[Email] [nvarchar](255) NOT NULL,
[ManagerEmail] [nvarchar](255) NOT NULL,
[Role] [nvarchar](15) NOT NULL,
[Timestamp] [timestamp] NOT NULL,
CONSTRAINT [PK_cts_user_detail_1] PRIMARY KEY CLUSTERED
(
[UserId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]