CODEWITHSUNDEEP
c#entity-framework
Beginner
Beginner

Reputation: 1030

Cannot implicitly convert type System.Collections.Generic.IEnumerable<> to bool

I'm developing an ASP.NET MVC 4 Application and I'm trying to run this Lambda expression in Entity Framework 5.

var customer = db.GNL_Customer.Where(d => d.GNL_City.FKProvinceID == advancedProvinceID || advancedProvinceID == null)
            .Where(d => d.FKCityID == advancedCityID || advancedCityID == null)
            .Where(d => d.FKDepartmentStoreID == advancedDepartmentStoreID || advancedDepartmentStoreID == null)
            .Where(d => d.GNL_CustomerLaptopProduct.Where(r => String.Compare(r.BrandName, brandID) == 0 || brandID == null));

I get this error :

Cannot implicitly convert type 'System.Collections.Generic.IEnumerable<ITKaranDomain.GNL_CustomerLaptopProduct>' to 'bool'

I know that the last where clause is wrong but I don't know how to correct it.

Upvotes: 11

Views: 23704

Answers (2)

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236268

Use Where ( Any ) in last statement to select customers which have at least one product satisfying your conditions:

var customer = db.GNL_Customer
   .Where(d => d.GNL_City.FKProvinceID == advancedProvinceID || advancedProvinceID == null)
   .Where(d => d.FKCityID == advancedCityID || advancedCityID == null)
   .Where(d => d.FKDepartmentStoreID == advancedDepartmentStoreID || advancedDepartmentStoreID == null)
   .Where(d => brandID == null || d.GNL_CustomerLaptopProduct.Any(r => r.BrandName == brandID));

Upvotes: 6

Andrew Whitaker
Andrew Whitaker

Reputation: 126072

You might want another .Any instead of a .Where in your .Any clause at the end:

var customer = db.GNL_Customer.Where(d => d.GNL_City.FKProvinceID == advancedProvinceID || advancedProvinceID == null)
            .Where(d => d.FKCityID == advancedCityID || advancedCityID == null)
            .Where(d => d.FKDepartmentStoreID == advancedDepartmentStoreID || advancedDepartmentStoreID == null)
            .Any(d => d.GNL_CustomerLaptopProduct.Any(r => String.Compare(r.BrandName, brandID) == 0 || brandID == null));

Upvotes: 19

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