Linq to Generic 列表 C# 数据过滤问题

Question

我在使用 C# 代码中的 linq 查询时遇到问题。我想排除具有 jobChangeTypeId Unallocate 或 Delete 但将它们带入结果集中的数据。

foreach (EmployeejobAudit empjobAudit in list)
{
     int iEmployeeServiceId = empjobAudit.EmployeeServiceId;

     PushNotificationData.jobAuditRow[] jobAuditList = empjobAudit.jobAuditList;

     var jobCallQuery = (from job in jobAuditList
                         where ((from dc in dataset.jobCall select dc.jobId).Contains(job.jobId)) && 
                        ( job.jobChangeTypeId != (int) Common.jobChangeTypeId.Unallocate  || job.jobChangeTypeId != (int) Common.jobChangeTypeId.Delete)                                   
                         select job).Distinct();

     if (jobCallQuery.Any())
     {
         foreach (var item in jobCallQuery)
         {
             System.Diagnostics.Debug.WriteLine("jobId {0}  Employee ServiceID {1} jobChange Type ID {2}", item.jobId, item.EmployeeServiceId, item.jobChangeTypeId);
         }
     }
}

Answer 1

如果您想同时排除它们，则它是 AND 而不是 OR

foreach (EmployeejobAudit empjobAudit in list)
{
     int iEmployeeServiceId = empjobAudit.EmployeeServiceId;

     PushNotificationData.jobAuditRow[] jobAuditList = empjobAudit.jobAuditList;

     var jobCallQuery = (from job in jobAuditList
                         where ((from dc in dataset.jobCall select dc.jobId).Contains(job.jobId)) && 
                        ( job.jobChangeTypeId != (int) Common.jobChangeTypeId.Unallocate && job.jobChangeTypeId != (int) Common.jobChangeTypeId.Delete)                                   
                         select job).Distinct();

     if (jobCallQuery.Any()) //Useless because the following foreach will do it for you, but you can test if != null 
     {
         foreach (var item in jobCallQuery)
         {
             System.Diagnostics.Debug.WriteLine("jobId {0}  Employee ServiceID {1} jobChange Type ID {2}", item.jobId, item.EmployeeServiceId, item.jobChangeTypeId);
         }
     }
}

Answer 2

您正在 || 而不是 &&。问题是当使用 || 时，两个表达式之一将始终为真，因此被包括在内。

这个：

job.jobChangeTypeId != (int) Common.jobChangeTypeId.Unallocate  
|| job.jobChangeTypeId != (int) Common.jobChangeTypeId.Delete

需要改成这样：

job.jobChangeTypeId != (int) Common.jobChangeTypeId.Unallocate  
&& job.jobChangeTypeId != (int) Common.jobChangeTypeId.Delete

Linq to Generic 列表 C# 数据过滤问题

Linq to Generic list C# Data Filtering issue

c#

linq

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generic-programming