不能键入'System.Web.Mvc.SelectList'隐式转换为“了System.Collections.Generic.ICollection＆LT; System.Web.Mvc.SelectList＆GT;' [英] Cannot implicitly convert type 'System.Web.Mvc.SelectList' to 'System.Collections.Generic.ICollection<System.Web.Mvc.SelectList>'

问题描述

我想一定值添加到我的SelectList数据成员在我的对象，但我得到一个错误

I am trying to add some values into my SelectList data member in my object but I get an error

public ActionResult Create()
    {

        var paf = new ProductAddForm();
        paf.Sizes = new SelectList(m.GetProductSizes());
        paf.Suppliers = new SelectList(m.GetAllSuppliersList(), "Id", "Name");

        return View(paf);
    }

这是我的科瑞功能和paf.Sizes / paf.Suppliers code不起作用。

that is my creat function, and the paf.Sizes / paf.Suppliers code does not work.

我productaddform类：

My productaddform class:

    public class ProductAddForm
{

    public double MSRP { get; set; }

    public string Name { get; set; }

    public string ProductId { get; set; }

    public ICollection<SelectList> Sizes { get; set; }

    public ICollection<SelectList> Suppliers { get; set; }

    public string UPC { get; set; }


}

和我的方法，我manager.cs

And my methods in my manager.cs

public IEnumerable<SupplierList> GetAllSuppliersList()
    {

        var fetchedObjects = ds.Suppliers.OrderBy(n => n.Name);

        var Suppliers = new List<SupplierList>();

        foreach (var item in fetchedObjects)
        {

            var s = new SupplierList();
            s.Name = item.Name;
            s.Id = item.Id;

            Suppliers.Add(s);
        }

        return (Suppliers);

    }

    public List<string> GetProductSizes()
    {

        return new List<string>() { "Small", "Medium", "Large" };
    }

哪些错误？

推荐答案

供应商是的SelectList 的集合。所以，你需要项目添加到集合

Suppliers is a collection of SelectList. So you need to Add item into the collection

修改

paf.Suppliers = new SelectList(m.GetAllSuppliersList(), "Id", "Name");

到

paf.Suppliers.Add(new SelectList(m.GetAllSuppliersList(), "Id", "Name"));

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