动作方法返回null

Question

在VendorControllder中，我有两种方法（一种显示全部，一种删除供应商）

// to display all vendor
 public ActionResult Index()
        {
            SLMEntitiesDB dbContext = new SLMEntitiesDB();
            List<Vendor> Vlist = dbContext.Vendors.ToList();
            return View(Vlist);
        }

// to delete vendor 
 public ActionResult delv(Vendor VID) //this return null 
        {
            SLMEntitiesDB dbContext = new SLMEntitiesDB();
            dbContext.DelV(VID.VID);
            return RedirectToAction("Index");
        }

DelV是如下过程

create procedure [dbo].[DelV]
(@VID int)
as
begin
Delete from vendor where VID=@VID
end

来自供应商索引，我有两个HTML Action链接，如下所示

        @Html.ActionLink("Delete", "delv", new { VID = item.VID },null)

当我运行应用程序时，VID返回null

Answer 1

看来您的ActionLink设置不正确。更改此

@Html.ActionLink("Delete", "delv", new { VID = item.VID },null)

为此

@Html.ActionLink("Delete", "delv", "Vendor", new { VID = item.VID },null)

记住对Html.ActionLink的设置是：链接文本，操作名称，控制器名称，路由值，HTML值