I have the following model;
public class Object
{
public int Id { get; set; }
public string Name { get; set; }
public Nullable<double> Price { get; set; }
public string Description { get; set; }
public string Image { get; set; }
public Nullable<int> Type { get; set; }
}
and i create a view model;
public class PlanBaseTypedObjects
{
public int? Id { get; set; }
public IEnumerable<Object> ObjectDetails { get; set; }
}
in my controller i did grouping as follows;
var model = model1.GroupBy(t => t.Type).Select(g => new PlanBaseTypedObjects
{
Id = g.Key,
ObjectDetails = g
});
How can i get the number of records that belong to a particular "Type"??
for an example for type 1 how many records under ObjectDetails??
and can i access the "objectDetails" directly??
for an example if i want to know the "Name" of Id=3 of Type 2.how can i get it??
You need to iterate on the grouping result to find the count for each one.
foreach(var group in model)
{
int groupCount = group.ObjectDetails.Count();
}
If you want to access the items in ObjectDetails you need another foreach:
foreach(var group in model
{
int groupCount = group.ObjectDetails.Count();
foreach(var item in group.ObjectDetails))
{
//do something with item
}
}
Related
I have developed a Site using asp net mvc 6, I have used enom as categories, now I need to get product count under each enom value,
Here is my enum look like,
namespace ecom.Data
{
public enum BookCategory
{
Action,
Comedy,
Drama,
Others
}
}
What I want is get products count under this enoms,
See here, Front view without product count
This is my Controller Looks like,
using ecom.Data.Services;
namespace ecom.Controllers;
public class HomeController : Controller
{
private readonly IBooksService _service;
public async Task <IActionResult> BookView(string slug)
{
var data = await _service.GetBookBySlugAsync(slug);
if(data == null) return View("NotFound");
return View("BookView", data);
}
This is model which i use as product model,
namespace ecom.Models
{
public class Book:IEntityBase
{
[Key]
public int Id { get; set; }
public string Name { get; set; }
public string Slug { get; set; }
public string Description { get; set; }
public double Price { get; set; }
public string Image { get; set; }
public string PublishDate { get; set; }
//enom
public BookCategory BookCategory { get; set; }
//Relationships
public List<Writter_Book> Writter_Books { get; set; }
//Publisher
public int PublisherId { get; set; }
[ForeignKey("PublisherId")]
public Publisher Publisher { get; set; }
}
}
My cshtml view right now,
#foreach (var cat in Html.GetEnumSelectList<BookCategory>())
{
<li>#cat.Text <span>()</span></li>
}
I want to get product count to above inside foreach's span tag,
Anyone can help me with that??
You can use GroupBy and Count to achieve your goal.
Something like
myBooksDataSource
.GroupBy(book => book.BookCategory)
.Select(group => new { Category = group.Key, Count = group.Count() });
Which will output a collection of (BookCategory, Count).
{ BookCategory.Action, 20 }
{ BookCategory.Comedy, 204 }
You can create a class to hold that data if you need to pass it around.
public class BookCategoryCountData
{
public BookCategory Category { get; set; }
public int Count { get; set; }
}
and select using that object.
public IEnumerable<BookCategoryCountData> GetBookCountByCategory()
{
return _context.Books
.GroupBy(book => book.BookCategory)
.Select(group => new BookCategoryCountData() {
Category = group.Key,
Count = group.Count()
});
}
I am a little puzzled to how I can add items depending on the value that is in a list of a list.
I have these models
public class ItemsModel
{
public int OrderItemId { get; set; }
public string Sku { get; set; }
public string Name { get; set; }
public int Quantity { get; set; }
}
public class OrdersModel
{
public int OrderId { get; set; }
public string OrderNumber { get; set; }
public List<ItemsModel> Items { get; set; }
}
public class OrderResultModel
{
public List<OrdersModel> Orders { get; set; }
}
Question
I need to add all orders from an api, but add Items that has SKU only ending with "5".
How can I do this?
How I tried it
I have an API call to get all orders.. List<OrdersModel> GetOrders().
Then I add the data like so:
public ObservableCollection<OrdersModel> Orders { get; private set; }
...
Orders = new ObservableCollection<OrdersModel>();
foreach (var item in GetOrders())
{
Orders.Add(item);
}
Here is how I tried to add values with SKU ending with 5:
var list = GetOrders().Where(x => x.Items.Any(i => i.Sku.EndsWith("5")));
foreach (var item in list)
{
Orders.Add(item);
}
Problem
This still shows me all values.. why? And how I can correct it?
foreach(var order in GetOrders())
{
order.Items = order.Items.Where(i => i.Sku.EndsWith("5")).ToList();
Orders.Add(order);
}
It's showing you all the value because Any() will evaluate to true if any of List of ItemsModels ends with 5.
you should filter on the list first something like
var filteredItems = orders.Items.Where(i => i.sku.EndsWith("5"))
I'm using ASP.NET Core 2.2. I have 2 models and a viewmodel which injects data to a view. I want to order results based on their productType. Let's make it clear
This is Product model
public class Product
{
public int ProductID { get; set; }
public int ProductName { get; set; }
public string ProductImage { get; set; }
public int ProductTypeID { get; set; }
[ForeignKey("ProductTypeID")]
public virtual ProductType ProductType{ get; set; }
}
This is ProductType model
public class ProductType
{
public int ProductTypeID { get; set; }
public int ProductTypeName { get; set; }
public string ProductTypeImage { get; set; }
public string ProductTypeDescription { get; set;
}
And finally this is DishesViewModel
public class DishesVM
{
public IEnumerable<ProductType> ProductType { get; set; }
public IEnumerable<Product> Product { get; set; }
}
In MyController I get data from DB then with automapper, map them to DishViewModel
public class HomeController : Controller
{
public IActionResult Dishes()
{
var productTypes= _context.ProductType.OrderBy(p =>p.ProductTypeID).ToList();
var products= _context.Products.OrderBy(p => p.ProductID).ToList();
var DishesVM = new DishesVM();
DishesVM.ProductType = _mapper.Map<IEnumerable<ProductType>>(productTypes);
DishesVM.Product = _mapper.Map<IEnumerable<Product>>(products);
}
}
Now in Dishes View I can have nested foreach
#model DishesViewModel
<div>
foreach(var pt in Model.ProductType)
{
<h1>pt.ProductTypeName</h1>
foreach(var p in Model.Product)
{
p.ProductName
}
}
</div>
This works fine but the only problem it has, is it returns all products. but I want each Product Category has its Products In front of its header. This is visual representation of what I want and what I have now.
This is what I want
But this is what I have
You have to filter your products by product type in each iteration. At the moment you just display all products for each product type:
<div>
foreach(var type in Model.ProductType)
{
//products which belong to the particular type
var productsForType = Model.Product.Where(x => x.ProductTypeID == type.ProductTypeID);
<h1>pt.ProductTypeName</h1>
foreach(var product in productsForType)
{
product.ProductName
}
}
</div>
This will give you a jump on the linq statement:
var list = productTypes.Where(x => x.ProductTypeID == 1).Select(x => new Product()
{
ProductImage = x.ProductTypeImage,
}).ToList();
You will need to decide on what to put into the where clause, I'm using ProductTypeID
I have this entity model for a recursively structured category tree:
public class ProductCategory
{
public int Id { get; set; }
public int? ParentId { get; set; }
public string Title { get; set; }
public int SortOrder { get; set; }
public ProductCategory ParentCategory { get; set; } //nav.prop to parent
public ICollection<ProductCategory> Children { get; set; } = new List<ProductCategory>();
public ICollection<ProductInCategory> ProductInCategory { get; set; }
public ICollection<FrontPageProduct> FrontPageProduct { get; set; } // Nav.prop. to front page product
// Recursive sorting:
public void RecursiveOrder()
{
Children = Children.OrderBy(o => o.SortOrder).ToList();
Children.ToList().ForEach(r => r.RecursiveOrder());
}
}
... and this, supposedly, matching ViewModel:
public class ViewModelProductCategory
{
public int Id { get; set; }
public int? ParentId { get; set; }
public string Title { get; set; }
public int SortOrder { get; set; }
public bool Checked { get; set; } // Used for assigning a product to multiple categories in Product/Edit
// Nav.props:
public ViewModelProductCategory ParentCategory { get; set; } // Nav.prop. to parent
public ICollection<ViewModelProductCategory> Children { get; set; } // Nav.prop. to children
public IEnumerable<ViewModelProduct> Products { get; set; } // Products in this category
public IEnumerable<ViewModelFrontPageProduct> FrontPageProducts { get; set; }
public string ProductCountInfo { get { return Products?.Count().ToString() ?? "0"; } }
}
When I try to populate the viewmodel, like this:
List<ProductCategory> DbM =
await _context.ProductCategories
.Include(c => c.Children)
.Where(x => x.ParentId == null)
.OrderBy(o => o.SortOrder)
.ToListAsync();
foreach (var item in DbM)
{
VMSelectCategories.Add(
new ViewModelProductCategory{
Id = item.Id,
Children = item.Children,
Title = item.Title
});
}
VisualStudio screams at me that it can't implicitly convert ProductCategory to ViewModelCategory. This happens at Children = item.Children.
Why isn't it working? Can't I have additional properties in the viewmodel that I use unrelated to the original entity model? Like Checked and ProductCountInfo?
In this line:
Children = item.Children,
Children is the ViewModelProductCategory.Children property, which is type ICollection<ViewModelProductCategory>, while item.Children is the ProductCategory.Children property, which is type ICollection<ProductCategory>. They are different types and neither inherits or implements the other so why would you expect to be able to assign an object of one type to a property of the other type? Would you expect this to work:
var list1 = new List<int> {1, 2, 3};
List<string> list2 = list1;
Of course not (I hope) because assigning a List<int> object to a List<string> variable would be silly. What you're trying to do is exactly the same. You need to provide some way to convert from one type to the other and then implement that in your code. An option for that might be like this:
Children = item.Children.Select(pc => MapToViewModel(pc)).ToList(),
where MapToViewModel is a method that you write to create a ViewModelProductCategory and populate its properties from a ProductCategory parameter.
You might also look at using something like AutoMapper.
I have a viewmodel which needs data from two models person and address:
Models:
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public int Gender { get; set; }
}
public class Address
{
public int Id { get; set; }
public string Street { get; set; }
public int Zip { get; set; }
public int PersonId {get; set; }
}
The Viewmodel is as such
public class PersonAddViewModel
{
public int Id { get; set; }
public string Name { get; set; }
public string Street { get; set; }
}
I have tried several ways to get data into the viewmodel and pass it to the view. There will be multiple records returned to display.
My latest method is populating the view model as such:
private AppContexts db = new AppContexts();
public ActionResult ListPeople()
{
var model = new PersonAddViewModel();
var people = db.Persons;
foreach(Person p in people)
{
Address address = db.Addresses.SingleOrDefault(a => a.PersonId == p.Id)
model.Id = p.Id;
model.Name = p.Name;
model.Street = address.Street;
}
return View(model.ToList());
}
I get an error on the Address address = db... line of "EntityCommandExecutionException was unhandled by user code.
How can you populate a view model with multiple records and pass to a view?
Final Solution:
private AppContexts db = new AppContexts();
private AppContexts dbt = new AppContexts();
public ActionResult ListPeople()
{
List<PersonAddViewModel> list = new List<PersonAddViewModel>();
var people = db.Persons;
foreach(Person p in people)
{
PersonAddViewModel model = new PersonAddViewModel();
Address address = dbt.Addresses.SingleOrDefault(a => a.PersonId == p.Id)
model.Id = p.Id;
model.Name = p.Name;
model.Street = address.Street;
}
return View(list);
}
First, EntityCommandExecutionException errors indicates an error in the definition of your entity context, or the entities themselves. This is throwing an exception because it's found the database to be different from the way you told it that it should be. You need to figure out that problem.
Second, regarding the proper way to do this, the code you've shown should work if your context were correctly configured. But, a better way would be to use Navigational properties, so long as you want to get all related records and not specify other Where clause parameters. A navigational property might look like this:
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
public int Gender { get; set; }
public virtual Address Address { get; set; }
// or possibly, if you want more than one address per person
public virtual ICollection<Address> Addresses { get; set; }
}
public class Address
{
public int Id { get; set; }
public string Street { get; set; }
public int Zip { get; set; }
public int PersonId { get; set; }
public virtual Person Person { get; set; }
}
Then you would simply say:
public ActionResult ListPeople()
{
var model = (from p in db.Persons // .Includes("Addresses") here?
select new PersonAddViewModel() {
Id = p.Id,
Name = p.Name,
Street = p.Address.Street,
// or if collection
Street2 = p.Addresses.Select(a => a.Street).FirstOrDefault()
});
return View(model.ToList());
}
For displaying lists of objects, you could use a generic view model that has a generic list:
public class GenericViewModel<T>
{
public List<T> Results { get; set; }
public GenericViewModel()
{
this.Results = new List<T>();
}
}
Have a controller action that returns, say all people from your database:
[HttpGet]
public ActionResult GetAllPeople(GenericViewModel<People> viewModel)
{
var query = (from x in db.People select x); // Select all people
viewModel.Results = query.ToList();
return View("_MyView", viewModel);
}
Then make your view strongly typed, taking in your generic view model:
#model NameSpace.ViewModels.GenericViewModel<NameSpace.Models.People>