如何重写这个LINQ语句来处理位置变量条件？

Question

public IQueryable<JobLevelsWithJobCountViewModel> JobLevelsWithJobCountViewModels(string location = null) 
{ 
    return (from jl in _dbContext.JobLevels 
      from j in jl.Jobs 
      .Where(job => job.Company.ZipCode.MajorArea.Contains(location)) 
      .Where(job => !job.IsDeleted && !job.IsPrivate) 
      group jl by jl.JobLevelId into g 
      select new JobLevelsWithJobCountViewModel 
      { 
       JobLevel = g.FirstOrDefault(), 
       JobCount = g.FirstOrDefault().Jobs.Count(j => !j.IsDeleted && !j.IsPrivate) 
      }); 
} 

我不希望添加这个条件。凡（作业=> job.Company.ZipCode.MajorArea.Contains（位置））如果位置是空

Answer 1

使用短路OR运营商如果location为空，则通过该条件：

.Where(job => location == null || job.Company.ZipCode.MajorArea.Contains(location))