我是程序员 ASP.net 初学者。我知道控制器正在调用列表，而模型正在调用通用模型，并且可以通过将视图中的模型设置为@model IEnumerable<WebApplication2.Models.Strategy>来轻松解决此问题
但我希望能够在视图中调用模型，以便我可以在我的视图中调用它。下面我发布了我的代码。
控制器：
public ActionResult Index(string group, string prin, string status, string osr, string groupnew, string stratvar, string fltstring, Strategy selg, FormCollection form)
{
if (Session["UserId"] != null)
{
Strategy strat = new Strategy();
int id = Int32.Parse(Session["UserId"].ToString()); // Get the user id from the session
String em = db.UserAccounts.Find(id).Email.ToString(); // Use the id to get the associated email address
EmailList emailListItem = db.EmailLists.First(x => x.Email == em); // Use the email address to get the associated emaillist object which holds the group
string perm = emailListItem.Perm;
if (perm == null)
{
perm = "0";
}
ViewData["perm"] = perm;
// if external
if (!emailListItem.IntExt)
{
// Create a list to hold the Todos which we will end up showing
List<Strategy> list = new List<Strategy>();
// this is a foreach loop, it goes through all the Todos returned from db.Todoes.ToList()
foreach (Strategy s in db.Strategies.ToList())
{
// makes sure that the group of a todo isn't null (empty)
if (!String.IsNullOrEmpty(s.Group))
{
// checks if the group of the user is equal to the group of the post. if so it adds the todo to the list.
if (emailListItem.Group.Equals(s.Group))
{
list.Add(s);
}
}
}
return View(list);
}
else
{
// This is the query building code.
string p = emailListItem.Perm;
string gr = emailListItem.Group;
StringBuilder sb = new StringBuilder();
sb.Append("SELECT * FROM dbo.Strategy WHERE "); //change table name for whatever you need returned
foreach (char c in p.ToCharArray())
{
if (group == null)
{
sb.Append("Perm LIKE '%");
sb.Append(c);
sb.Append("%' OR ");
}
}
sb.Length = sb.Length - 4;
if (selg == null)
{
List<Strategy> list = db.Strategies.SqlQuery(sb.ToString()).ToList(); //change table name
return View(list);
}
else
{
var groups = from g in db.Strategies
select g;
var prins = from pr in db.Strategies
select pr;
var osrs = from o in db.Strategies
select o;
var statuss = from s in db.Strategies
select s;
ViewBag.Groupcmb = (from g in db.Strategies.Include(p) where g.Group != null
select g.Group).Distinct();
ViewBag.Principalcmb = (from pr in db.Strategies.Include(p) where pr.Principal != null
select pr.Principal).Distinct();
ViewBag.OSRcmb = (from o in db.Strategies.Include(p) where o.OSR != null
select o.OSR).Distinct();
ViewBag.Statuscmb = (from s in db.Strategies.Include(p) where s.Status != null
select s.Status).Distinct();
//ViewData["OSR"] = new SelectList(ViewBag.OSRcmb);
ViewBag.osrsel = osr;
//if all filters are null
if (group == null && stratvar == null && prin == null && osr == null && status == null)
{
return View(db.Strategies.ToList());
}
//returns same search filter for group if edit
if (stratvar != null && group == null)
{
group = stratvar;
groups = groups.Where(g => g.Group.Contains(group));
// return View(group.ToList());
};
if (prin != null && group != null && osr != null && status != null)
{
ViewBag.osrsel = osr;
prins = prins.Where(gpr => gpr.Principal.Contains(prin) && gpr.Group.Contains(group) && gpr.OSR.Contains(osr) && gpr.Status.Contains(status));
stratvar = null;
return View(prins.ToList());
}
return View(strat);
}
}
}
else
{
return RedirectToAction("Login", "Account");
}
}
视图：
@model WebApplication2.Models.Strategy
<h2>Index</h2>
<div class="col-md-6">
@Html.ActionLink("Create New", "Create")
</div>
<div class="col-md-6">
@if ((ViewData["perm"]).ToString() != "0")
{
using (Html.BeginForm())
{
<table>
<tr>
<td>Group</td>
<td>@Html.DropDownList("group", new SelectList(ViewBag.Groupcmb), "--Select--")</td>
<td>Status</td>
<td>@Html.DropDownList("status", new SelectList(ViewBag.Statuscmb), "--Select--")</td>
<td>Principal</td>
<td>@Html.DropDownList("prin", new SelectList(ViewBag.Principalcmb), "--Select--")</td>
<td>OSR</td>
<td>@Html.DropDownListFor(m => m.OSR, new SelectList(ViewBag.OSRcmb), "--Select--")</td>
<td>
<input type="submit" value="Search" onclick="location.href='@Url.Action("Index", "Strategy")'" />
</td>
</tr>
</table>
}
}
else if ((ViewData["perm"]).ToString() == "0")
{
<div class="col-md-6 hide">
@using (Html.BeginForm())
{
}
</div>
}
</div>
<div class="col-md-12"></div>
<table class="table">
<tr>
<th>
@Html.DisplayNameFor(model => model.Customer)
</th>
<th>
@Html.DisplayNameFor(model => model.Product)
</th>
<th>
@Html.DisplayNameFor(model => model.Status)
</th>
<th>
@Html.DisplayNameFor(model => model.NextAction)
</th>
<th>
@Html.DisplayNameFor(model => model.Updated)
</th>
<th>
@Html.DisplayNameFor(model => model.FollowUpDate)
</th>
<th>
@Html.DisplayNameFor(model => model.OSR)
</th>
<th>
@Html.DisplayNameFor(model => model.Principal)
</th>
<th>
@Html.DisplayNameFor(model => model.Value)
</th>
<th></th>
</tr>
@*@foreach (var item in Model)
{*@
<tr>
<td>
@Html.DisplayFor(model => model.Customer)
</td>
<td>
@Html.DisplayFor(model => model.Product)
</td>
<td>
@Html.DisplayFor(model => model.Status)
</td>
<td>
@Html.DisplayFor(model => model.NextAction)
</td>
<td>
@Html.DisplayFor(model => model.Updated)
</td>
<td>
@Html.DisplayFor(model => model.FollowUpDate)
</td>
<td>
@Html.DisplayFor(model => model.OSR)
</td>
<td>
@Html.DisplayFor(model => model.Principal)
</td>
<td>
@Html.DisplayFor(model => model.Value)
</td>
<td>
@Html.ActionLink("Edit", "Edit", new { id = Model.StrategyId, group = Model.Group }) |
@Html.ActionLink("Details", "Details", new { id = Model.StrategyId })
@*|*@
</td>
</tr>
</table>
您可以将视图中的模型类型设置为：
@model IEnumerable<WebApplication2.Models.Strategy>
在观点上：
if(Model != null)
{
foreach(var strategy in Model)
{
//strategy should give you all the details you need
}
}
想象一下，你有一个StategyViewModel。 如果您的视图呈现多个类型，您会发现在超类型("ViewModel"类型)中组织这些类型更容易。
阅读有关 MVVM 模式的信息
在这种情况下，而不是...
型：
public class Strategy
{
public string name;
// all your other properties...
}
视图：
@model WebApplication2.Models.Strategy
<!-- present some stuffs... -->
控制器：
public ActionResult Index()
{
var strategy = new Strategy(); // a concrete model type/class
// do some stuffs...
// using ViewBag to pass a bag of stuffs...
return View(strategy);
}
更改为此...
视图模型：
public class StrategyViewModel
{
public Strategy strategy;
public string someString; // instead of ViewBag'ing everything?
}
视图：
@model WebApplication2.ViewModels.StrategyViewModel
<!-- present some stuffs... -->
控制器：
public ActionResult Index()
{
var vm = new StrategyViewModel();
// do some stuffs...
return View(vm);
}