如何在 IQueryable 中使用带有列表整数的过滤结果

Question

我的程序包含几个 table。其中一些 table 如下：国家 table - 产品 table - ProductCountry（交界处 table）。当在商店页面上应用过滤器时（示例。com/shop），我想将所选国家/地区的过滤器应用于结果，它经历了各个阶段（这些国家/地区的 ID 是整数列表) 写了好几种方式，都有错误。感谢您的帮助


IQueryable<ProductLocalization> result = _context.ProductLocalizations
                .Include(c => c.Languages)
                .Include(c => c.ProductPropertyLocalizations)
                .Include(c => c.Product)
                .Include(c => c.Product.UserProducts)
                .Include(c => c.Product.Brand)
                .Include(c => c.Product.Category)
                .Include(c => c.Product.Category.CategoryPropertyLocalizations)
                .Where(c => c.LanguageId == languageId);

if (countryId.Count != 0)
            {
                result = result.Where(c => countryId.Contains(c.Product.CountryProducts.Select(b => b.CountryId));
                result = result.Where(c => c.Product.CountryProducts.Any(b => b.CountryId == countryId));
                result = result.Where(c => countryId.Any(b => b == c.Product.CountryProducts[0].CountryId)); //for example
                result = result.Where(c => c.Product.CountryProducts.Select(c => countryId.Any(c.CountryId)));
                result = result.Where(c => c.Product.CountryProducts.FindAll(b => b.CountryId == countryId));
                result = result.Where(c => c.Product.CountryProducts.Select(c => c.CountryId).Contains(countryId);
                result = result.Where(c => countryId.Any(b => b == c.Product.CountryProducts.Select(a=>a.CountryId)));
            }

Answer 1

尝试以下过滤器：

result = result.Where(c => 
   c.Product.CountryProducts.Any(b => countryId.Contains(b.CountryId))
);

如何在 IQueryable 中使用带有列表整数的过滤结果

How to use filter result with list integer in IQueryable

linq

entity-framework

entity-framework-core

ef-core-3.1