I have a Product table in my DB. Also, I have Brand and Category tables in my DB which are not related to each other. I want to relate these. In the form UI when I click the one of the Categories, should come the Brands which they have products in the related category.
I tried this way to do this. First, I get my products by categoryID with GetList method then I get these products' brands and I added these brands to pblist list(Brand type). However, some products have the same brands and pblist have repeated brand names. I tried to fix this with contains method but it does not work. Also, I have the same problem in the other part which I try to remove brands not included in pblist from blist(all brands' list). I tried removing item from blist by taking its index with this code: blist.RemoveAt(blist.IndexOf(item)); but this one also not working.It returns -1. But item is in the blist.
public class BrandVM : BaseVM
{
public int ProductCount { get; set; }
}
public class BaseVM
{
public int ID { get; set; }
public string Name { get; set; }
public override string ToString()
{
return this.Name;
}
public class BrandService : ServiceBase, IBrandService
{
public List<BrandVM> GetList(int Count)
{
try
{
var result = GetQuery();
result = Count > 0 ? result.Take(Count) : result;
return result.ToList();
}
catch (Exception ex)
{
return null;
}
}
public List<BrandVM> GetListByCatID(int pCatID)
{
var plist = productService.GetListByCatID(pCatID);
List<BrandVM> pblist = new List<BrandVM>();
foreach (var item in plist)
{
if (!pblist.Contains(item.Brand))
{
pblist.Add(item.Brand);
}
};
var blist = GetList(0);
var blistBackup = GetList(0);
foreach (BrandVM item in blistBackup)
{
if (!pblist.Contains(item))
{
blist.Remove(item);
}
};
return blist;
}
These are my classes related to Brand. In BrandService I shared the filled methods there are more methods to fill.
This is method is in my ProductService: I use that method to pull product list by CategoryID (plist)
public List<ProductVM> GetListByCatID(int EntityID)
{
try
{
var result = GetQuery().Where(x => x.Category.ID==EntityID);
return result.ToList();
}
catch (Exception ex)
{
return null;
}
}
This GetQuery method for ProductService, in other services there are some differences but there are similar
private IQueryable<ProductVM> GetQuery()
{
return from p in DB.Products
select new ProductVM
{
ID = p.ProductID,
Name = p.ProductName,
UnitPrice = (decimal)p.UnitPrice,
Category =p.CategoryID==null?null:new CategoryVM()
{
ID = (int)p.CategoryID,
Name = p.Category.CategoryName
},
Brand = p.BrandID == null ? null :
new BrandVM
{
ID=(int)p.BrandID,
Name=p.Brand.BrandName,
}
};
}