C＃，Linq2Sql，.NET 2.0，SQL 2005 Express
当我运行以下代码时，我得到了一个 InvalidCastException无法将System.Byte []类型强制转换为System.String
这不会发生在表中的所有行上，即此代码运行正常。
我检查表中没有linq声明为SYstem.Byte []
的列堆栈跟踪表示在linq语句和I11时发生异常 在代码中，GetProject永远不会被调用，此异常发生在此方法之前 被称为。
所以我认为这是Linq框架错误。
这让我难过？任何想法？
[代码]
public Project GetProject(int id)
{
var project = (from row in _dbctx.Projects
where row.ProjectID == id
select row).SingleOrDefault();
Project proj = GetProject(project);
return proj;
}
private Project GetProject(TBRServices.Domain.TBR.DataContext.Project sqlproject)
{
Project project = new Project();
project.ProjectID = sqlproject.ProjectID;
project.ProjectName = sqlproject.ProjectName;
project.ProjectDescription = sqlproject.ProjectDescription;
project.ClientID = sqlproject.ClientID;
project.PurchaseOrderNumber = sqlproject.PurchaseOrderNumber;
project.ProjectTotalBillingEstimate = sqlproject.ProjectTotalBillingEstimate;
project.EmployeeID = sqlproject.EmployeeID;
project.ProjectBeginDate = sqlproject.ProjectBeginDate.ToString();
project.ProjectEndDate = sqlproject.ProjectEndDate.ToString();
project.Active = sqlproject.Active;
project.InclGST = sqlproject.InclGST;
project.ContractRate = sqlproject.ContractRate;
project.MarginRate = sqlproject.MarginRate;
project.Notes = sqlproject.Notes;
project.PayrollTax = sqlproject.PayrollTax;
project.EmployeeReference = sqlproject.EmployeeReference;
project.PayReference = sqlproject.PayReference;
project.ProjectLocation = sqlproject.ProjectLocation;
project.ContractTypeID = sqlproject.ContractTypeID;
project.DoNotCalcMarginOrGST = sqlproject.DoNotCalcMarginOrGST;
project.ConvertToInvoice = sqlproject.ConvertToInvoice;
project.AuthFirstname = sqlproject.AuthFirstname;
project.AuthLastname = sqlproject.AuthLastname;
project.AuthEmail = sqlproject.AuthEmail;
project.CapturedDocumentType = sqlproject.CapturedDocumentType;
project.TimesheetProcessingType = sqlproject.TimesheetProcessingType;
project.TimesheetFrequency = sqlproject.TimesheetFrequency;
project.AggregateTimesheet = sqlproject.AggregateTimesheet;
project.AggregateAutomatically = sqlproject.AggregateAutomatically;
project.BusProcEmpCut = sqlproject.BusProcEmpCut;
project.BusProcAgencyCut = sqlproject.BusProcAgencyCut;
project.SendCopyTimesheet = sqlproject.SendCopyTimesheet;
project.TimesheetRecipient1 = sqlproject.TimesheetRecipient1;
project.TimesheetRecipient2 = sqlproject.TimesheetRecipient2;
project.SendCopyInvoice = sqlproject.SendCopyInvoice;
project.PublishedOn = sqlproject.PublishedOn.ToString();
project.SendAggTimesheetsWhenReceived = sqlproject.SendAggTimesheetsWhenReceived;
project.AuthoriseInvoice = sqlproject.AuthoriseInvoice;
project.HourlyDailyMthly = sqlproject.HourlyDailyMthly;
project.EmployeeCategory = sqlproject.EmployeeCategory;
project.AgencyRate = sqlproject.AgencyRate;
project.ConsultantID = sqlproject.ConsultantID;
project.SendCopyInvoiceEmployee = sqlproject.SendCopyInvoiceEmployee;
project.UseClientDetailsForTimesheet = sqlproject.UseClientDetailsForTimesheet;
project.FaxedTimesheet = sqlproject.FaxedTimesheet;
project.TimesheetEditable = sqlproject.TimesheetEditable;
project.IncludeInReport = sqlproject.IncludeInReport;
project.SendLogonEmail = sqlproject.SendLogonEmail;
project.NoticePeriodID = sqlproject.NoticePeriodID;
project.ManagerCanViewPaidUnpaid = sqlproject.ManagerCanViewPaidUnpaid;
project.LesterSalesStaff = sqlproject.LesterSalesStaff;
project.IncludeSalesReport = sqlproject.IncludeSalesReport;
project.CurrencyAccount = sqlproject.CurrencyAccount;
project.LeaveMustBeAuthorisedTimesheet = sqlproject.LeaveMustBeAuthorisedTimesheet;
project.LeaveMustBeAuthorisedLeaveForm = sqlproject.LeaveMustBeAuthorisedLeaveForm;
project.DefaultHoursWorkedWeek = sqlproject.DefaultHoursWorkedWeek;
project.DefaultHoursWorkedDay = sqlproject.DefaultHoursWorkedDay;
project.AccruedLeaveStartDate = sqlproject.AccruedLeaveStartDate.ToString();
project.AllowLeaveMoreThanAccrued = sqlproject.AllowLeaveMoreThanAccrued;
project.IsPaidASalary = sqlproject.IsPaidASalary;
project.AgencyID = sqlproject.AgencyID;
project.SendEmailToManagerToOKLeave = sqlproject.SendEmailToManagerToOKLeave;
project.SpecialPayrollNotes = sqlproject.SpecialPayrollNotes;
project.SpecialInvoicingNotes = sqlproject.SpecialInvoicingNotes;
project.InvoiceTermsMessage = sqlproject.InvoiceTermsMessage;
project.AuthManagerPhone = sqlproject.AuthManagerPhone;
project.LMF = sqlproject.LMF;
project.LMFPercent = sqlproject.LMFPercent;
project.LMFInclInPayRate = sqlproject.LMFInclInPayRate;
project.LMFOnTop = sqlproject.LMFOnTop;
project.AgencyComm = sqlproject.AgencyComm;
project.AgencyCommPercent = sqlproject.AgencyCommPercent;
project.AgencyCommInclInPayRate = sqlproject.AgencyCommInclInPayRate;
project.AgencyCommOnTop = sqlproject.AgencyCommOnTop;
project.PayRateInclMargin = sqlproject.PayRateInclMargin;
project.MarginRatePercent = sqlproject.MarginRatePercent;
project.MarginRateGST = sqlproject.MarginRateGST;
project.MarginRateInclInPayRate = sqlproject.MarginRateInclInPayRate;
project.MarginRateOnTop = sqlproject.MarginRateOnTop;
project.PayRateInclSuper = sqlproject.PayRateInclSuper;
project.PayrollTaxAmount = sqlproject.PayrollTaxAmount;
project.PayrollTaxPercent = sqlproject.PayrollTaxPercent;
project.PayrollTaxInclInPayRate = sqlproject.PayrollTaxInclInPayRate;
project.PayrollTaxOnTop = sqlproject.PayrollTaxOnTop;
project.TypeOfArrangement = sqlproject.TypeOfArrangement;
project.ParameterRequired = sqlproject.ParameterRequired;
project.SpecialPayrollEnabled = sqlproject.SpecialPayrollEnabled;
project.ClientContactUsedReceiptOfInvoiceID = sqlproject.ClientContactUsedReceiptOfInvoiceID;
project.ExcludeEmpNameOnInvoice = sqlproject.ExcludeEmpNameOnInvoice;
project.BPForReporting = sqlproject.BPForReporting;
project.UseGemteqInvoiceFormat = sqlproject.UseGemteqInvoiceFormat;
project.TreatPayrollDetailsSameAsBP = sqlproject.TreatPayrollDetailsSameAsBP;
return project;
}
[/代码]
答案 0 :(得分：0)
无法将System.Byte []类型强制转换为System.String
表示sqlproject中的属性存储为byte[]，而project中的相应属性为string
答案 1 :(得分：0)
检查类似SO问题的答案。它不是确切的答案，但可以帮助您在查询中找到问题 -