How to define List with data from model and then use with lambda expression to get all elements

Question

What i trying to do is to fill list with names with data from model and set to View and show in view With dropDownListFor ...is my logic a right ...and what i should do else

Model :

public class Categories{
public int id {get;set}
public string categoryName{get;set}
    public List<CategoryName> catNames {get;set;} //or IEnumerable<>
}

controller:

public ActionResult getSomething(){
public List<CategoryName>   list = new List<CategoryName>() ;
public List<CategoryName> names= list.FindAll(x=>x.categoryName);
return View(names)
}

Darin Dimitrov · Accepted Answer · 2013-03-03 09:30:10Z

1

You have invalid C# syntax but you are on the right track.

Define a model:

public class CategoriesModel
{
    public int Id { get; set }
    public string CategoryName { get; set }
    public List<CategoryName> CategoryNames { get; set; }
}

a controller:

public class HomeController: Controller
{
    public ActionResult Index()
    {
        var model = new CategoriesModel();
        model.CategoryNames = GetCategoryNames();
        return View(model);
    }

    private List<CategoryName> GetCategoryNames()
    {
        // TODO: you could obviously fetch your categories from your DAL
        // instead of hardcoding them as shown in this example
        var categories = new List<CategoryName>();
        categories.Add(new CategoryName { Id = 1, Name = "category 1" });
        categories.Add(new CategoryName { Id = 2, Name = "category 2" });
        categories.Add(new CategoryName { Id = 3, Name = "category 3" });
        return categories;
    }
}

and finally a strongly typed view to the model:

@model CategoriesModel
@using (Html.BeginForm())
{
    @Html.DropDownListFor(
        x => x.CategoryName, 
        new SelectList(Model.CategoryName, "Id", "Name")
    )
    <button type="submit"> OK</button>
}

You haven't shown your CategoryName model but in this example I am supposing that it has properties called Id and Name which is what the DropDownList is bound to.

answered Mar 3, 2013 at 9:30

Darin Dimitrov

1.0m277 gold badges3.3k silver badges3k bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Darin Dimitrov Over a year ago

@user2026573,StackOverflow is an English speaking website, so please write in English. If you want to fill the categories from your database you could simply query it instead of hardcoding the values as shown in my answer. For example if you are using Entity Framework and already have a DbContext you could directly fetch the category names from it: model.CategoryNames = db.CategoryNames.ToList();

Collectives™ on Stack Overflow

How to define List with data from model and then use with lambda expression to get all elements

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related