返回 function 以获取 id 列表

Question

I have method that returns function for companySurveys

Here is it

private Func<IQueryable<Client>, IQueryable<CompanySurvey>> JoinCompanySurvey(int id, 
        IQueryable<CompanySurvey> companuSurveyQuery)
    {
       var function = (IQueryable<Client> companies) => from companySurvey in companuSurveyQuery
                          where companySurvey.Id == id
                          join company in companies
                          on companySurvey.CompanyId equals company.CompanyId
                          into res
                          from company in res
                          select companySurvey;

        return function;
    }

id parameter is companySurvey ID.

I need method that can work with list of id's.

So I can send here List and return function for many companySurveys

So same stuff as now, but for many.

How I need to rewrite this method?

Answer 1

How about this, change parameter int Id to IEnumerable<int> ids and in the func body change companySurvey.Id == id to ids.Contains(companySurvey.Id)

 private Func<IQueryable<Client>, IQueryable<CompanySurvey>> JoinCompanySurvey(IEnumberable<int> ids, 
    IQueryable<CompanySurvey> companuSurveyQuery)
{
   var function = (IQueryable<Client> companies) => from companySurvey in companuSurveyQuery
                      where ids.Contains(companySurvey.Id)
                      join company in companies
                      on companySurvey.CompanyId equals company.CompanyId
                      into res
                      from company in res
                      select companySurvey;

    return function;
}