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Hello Guys
I am quite new to linq and .net core. I am trying to calculate the next tax return date of a company as a part of my final year’s project.

    If there is a newly made company with no tax has been made yet (means no entry in the tax table), Then add 18 months in the company’s incorporated date.
    If the company has already paid tax, then pick the latest date TaxReturnDate from tax table and add 9 months into that to get the next TaxReturnDate.

Thats what i have tried in SQL, now i am trying to convert this sql into Linq Query, I need some help to get the desired results.


What I have tried:

WITH cte_company (CompanyID, CompanyName, CompanyNumber,IncorporatedDate,TOTAL_YEARS)    AS (
SELECT 
CompanyID,
CompanyName,
CompanyNumber, 
IncorporatedDate,
DateDiff(YEAR,IncorporatedDate,CURRENT_TIMESTAMP) AS TOTAL_YEARS  
FROM tbl_Company 
)
SELECT 
cte_company.CompanyID,
CompanyName,
CompanyNumber, 
IncorporatedDate,
TOTAL_YEARS,  
CASE WHEN TOTAL_YEARS > 1 THEN (select DateAdd(MONTH,9,Max(TaxReturnDate )) from tbl_Tax  where cte_company.CompanyID = tbl_Tax.CompanyID )
ELSE DateAdd(month,18,IncorporatedDate )
END AS TaxDate
FROM cte_company


IEnumerable<CompanyTaxInfo> result = from c in this.AcmeDB.tbl_Company
                   let TotalYears = (DateTime.Now - c.IncorporatedDate).Value.Days / 365
                   let taxReturnDate = this.AcmeDB.tbl_Tax.Max(tx => tx.TaxReturnDate).Value.AddMonths(9)
                   select new CompanyTaxInfo
                   {
                       CompanyID = c.CompanyID,
                       CompanyName=  c.CompanyName,
                       CompanyNumber=  c.CompanyNumber,
                       IncorporatedDate= c.IncorporatedDate,
                       TotalYears = TotalYears,
                       TaxDate = TotalYears > 1 ? taxReturnDate :    c.IncorporatedDate.Value.AddMonths(18)
                   };


  return result;
Posted
Updated 23-Feb-23 1:56am
v2
Comments
Maciej Los 18-Jul-22 15:30pm    
What's wrong with your linq query?
Member 15627495 23-Feb-23 8:18am    
hi !

bookmark this link for your LINQ query.
It's a .Net fiddle, :: https://dotnetfiddle.net/
Dave Kreskowiak 23-Feb-23 11:20am    
I seriously doubt the OP is still working on this little problem 7 months later.

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