Check date exist or not

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I want to add custom validation where if once date adds then same or between date cannot be added.

start date and End date

if suppose I add 01-06-2018 to 10-06-2018 this record

then no more between this record can be added.

suppose user enter now 06-06-2018 to 15-06-2018 then return false. because 06-06-2018 is already registered first.

What I have tried:

List lstOffers = db.OfferMasters.Where(x => ((x.OfferStartDate = dtStart) || (x.OfferStartDate >= dtEndDate && x.OfferEndDate = dtStart && x.OfferEndDate <= dtEndDate)) && x.IsActive && x.RestaurantId == RestaurantId).ToList();

Posted 27-Jun-18 19:53pm

Jaydeep Shah

Updated 28-Jun-18 6:47am

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Krunal Rohit 28-Jun-18 2:07am

Shouldn't be it like this? -

List lstOffers = db.OfferMasters.Where(x => ((x.OfferStartDate == dtStart) || (x.OfferStartDate >= dtEndDate && x.OfferEndDate == dtStart && x.OfferEndDate <= dtEndDate)) && x.IsActive && x.RestaurantId == RestaurantId).ToList();

StartDate and EndData should be compared.

KR

2 solutions

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Maciej Los · Answer 1 · 2018-06-27T22:20:00

First of all, i'd suggest to read this: Time Period Library for .NET[^], because it may help you in understanding the relationship between two time periods...

According to your requirement, your StartDate have to be greater than Max(OfferEndDate). In other words, if StartDate is less than Max(OfferEndDate) your method should return false.

Richard Deeming · Answer 2 · 2018-06-28T06:48:00

Solution 2

Assuming you want to find out whether there are any offers which overlap the specified date range:

C#

bool anyOverlappingOffers = db.OfferMasters
    .Where(x => x.RestaurantId == RestaurantId && x.IsActive)
    .Any(x => x.OfferStartDate <= dtEndDate && dtStartDate <= x.OfferEndDate);

Posted 28-Jun-18 6:48am

Richard Deeming