如何在linq查询中为整型列设置null条件。获取整型列的空引用异常

Question

  Dim payorProvidersList = (From pp In payorProviders
                                 Group Join p In accPayors On p.PayorCode Equals pp.PayorCode Into gpPP = Group From p In gpPP.DefaultIfEmpty()
                                 Group Join hpc In hipaaPayorConnectors On hpc.ConnectorId Equals pp.ConnectorID And hpc.PayorCode Equals pp.PayorCode And hpc.TransactionType Equals pp.TransactionType Into gpHPC = Group From hpc In gpHPC.DefaultIfEmpty()
                                 Select New PayorProvidersInfo With
                                    {
                                       .ID = pp.ID,
                                       .PayorCode = pp.PayorCode,
                                       .ProviderId = pp.ProviderId,
                                       .CreatedBy = pp.CreatedBy,
                                       .CreatedDate = pp.CreatedDate,
                                       .UpdatedBy = pp.UpdatedBy,
                                       .UpdatedDate = pp.UpdatedDate,
                                       .ConnectorID = pp.ConnectorID,
                                       .NPI = pp.NPI,
                                       .Order = hpc.Order,
                                       .TransactionType = pp.TransactionType,
                                       .PayorName = If(p IsNot Nothing AndAlso p.PayorName IsNot Nothing, p.PayorName, "Unknown"),
                                       .EmdeonPayorName = If(p IsNot Nothing AndAlso p.EmdeonPayorName IsNot Nothing, p.EmdeonPayorName, "Unknown")}).ToList()

Answer 1

用If(hpc.ConnectorId, 0)替换hpc.ConnectorId。

编辑：

根据您的评论，您的问题不是整型字段，而是hpc对象本身。

尝试用If(hpc is nothing, 0,hpc.ConnectorId)替换hpc.ConnectorId