Question

I’ve been trying to get the “Count” for my “Value” field in my query expression. In my code it suppose to create a list of checkboxes and beside the checkboxes is a count of how many items are in the list(checkbox).

Could someone show me how to get the count for the items of my field Value this is a checbox filtering system I’m making.I’ve just started learning linq and lambda exressions.

Code in C# ASP.NET

var dept = Page.RouteData.Values["department"];
var department = (from d in db.Departments where d.Name.Replace(" ", "-") == dept select new {d.Id, d.Name}).FirstOrDefault();

 var query = (from p in db.Products
              join f in db.ProductFilters on p.Id equals f.ProductId into filters
              from x in filters.Where(x => x.Product.DepartmentId == department.Id)                            
              select new { x.Id, x.Name, x.Value }).ToList();

 var brand = query.Where(x => x.Name == "Brand").OrderBy(x => x.Value);
 var price = query.Where(x => x.Name == "Price").OrderBy(x => x.Value);

 var brandAndPrice = brand.Concat(price);

 var labelBrandAndPrice = (from f in brandAndPrice select new { f.Name }).Distinct().OrderBy(x => x.Name);
 //var otherFilters = query.Except(brandAndPrice);

 StringBuilder sb = new StringBuilder();
 sb.Append("<div class=\"Filters\">");                
 foreach (var label in labelBrandAndPrice)
 {
     sb.Append("<span>" + label.Name + "</span><br />");
     sb.Append("<div class=\"ProdFilters\">");
     // Below is where I wanted to do distinct expression and groupby but it didn't work
     var BrandPriceCollection = brandAndPrice.Where(x => x.Name == label.Name).Distinct().ToList();
     foreach (var bp in BrandPriceCollection)
     {
        //Here i want to write out the count for the field Value 
        sb.Append("<input type=\"checkbox\" id=\"" + bp.Value + "\" /><span>" + bp.Value + "(" + "Count" + ")" + "</span><br />");
     }
     sb.Append("</div>");
 }               
 sb.Append("</div>");

Answer 1

var BrandPriceCollection = brandAndPrice.Where(x => x.Name == label.Name).Distinct().ToList();
var groupings = BrandPriceCollection.GroupBy(x => x.Value);
foreach (var g in groupings)
{
   //Here i want to write out the count for the field Value 
   sb.Append("<input type=\"checkbox\" id=\"" + g.Key + "\" /><span>" + g.Key + "(" + g.Count() + ")" + "</span><br />");
}

GroupBy returns your data in the structure like Dictionary, with value you are grouping on in Key property and the collection of elements inside, so you can just Count() it. Note that groupings is the collection of collections now.