Asp.net-mvc – How to use ViewBag to pass list of data from View to controller

asp.net-mvcviewbag

how can i sen a list of items from a view to a controller to save it. i believe that i can use Viewbag but i dont realy no how to use ite to pass data from view to controller.

this is what i have tried
My view

@using (Html.BeginForm()) {
@Html.ValidationSummary(true)
<fieldset>
    <legend>ProductionOrderItem</legend>


    <div class="editor-label">
        @Html.Label("ProducrionOrderNo");
    </div>
    <div class="editor-field">
        @Html.TextBox("ProductionOrderNo", ViewBag.ProductionOrder as int)

    </div>

    <div class="editor-label">
       @Html.Label("OrderName")
    </div>
    <div class="editor-field">
        @Html.TextBox("OrderName", ViewBag.ProductionOrder as string)
    </div>
 <div class="editor-label">
       @Html.Label("OrderDate")
    </div>
    <div class="editor-field">
        @Html.TextBox("OrderDate", ViewBag.ProductionOrder as DateTime)
</div>
      <p>
        <input type="submit" value="Create" />
    </p>
</fieldset>
}

and my controller

   [HttpPost]
     public ActionResult Create(FormCollection collection)
     {
        ProductionRegistration pr = new ProductionRegistration();
        ProductionItem poi = new ProductionItem();

         poi = Viewbag.ProductionOrder;

         pr.SaveOrder(Conn, poi);
         return RedirectToAction("Index");

     }

Best Answer

You can't pass data from ViewBag/ViewData to the controller. It's one-way only (controller to view). The only way to get data back to the controller is to post it (post-body) or send it along in a querystring.

In fact, you should really avoid ViewBag as much as possible. It was added as a convenience and like most convenience methods, it's abused more often than not. Use a view model to both pass data to the view and accept data back from a post.

You strongly-type your view with:

@model Namespace.For.My.OrderViewModel

Then, you can use the [Foo]For methods of Razor to build your fields in a strongly-typed way:

<div class="editor-label">
    @Html.LabelFor(m => m.ProductionOrderNo);
</div>
<div class="editor-field">
    @Html.TextBoxFor(m => m.ProductionOrderNo)
</div>

And finally in your post action, you accept the view model as a param:

[HttpPost]
public ActionResult Create(OrderViewModel model)
{
    ...
}

And let MVC's modelbinder wire up the posted data for you.

No more dynamics. Everything is strongly-typed end-to-end, so if something goes wrong, you'll know it at compile-time, not run-time.

For MVC v5.1 use Html.EnumDropDownListFor

@Html.EnumDropDownListFor(
    x => x.YourEnumField,
    "Select My Type", 
    new { @class = "form-control" })

For MVC v5 use EnumHelper

@Html.DropDownList("MyType", 
   EnumHelper.GetSelectList(typeof(MyType)) , 
   "Select My Type", 
   new { @class = "form-control" })

For MVC 5 and lower

I rolled Rune's answer into an extension method:

namespace MyApp.Common
{
    public static class MyExtensions{
        public static SelectList ToSelectList<TEnum>(this TEnum enumObj)
            where TEnum : struct, IComparable, IFormattable, IConvertible
        {
            var values = from TEnum e in Enum.GetValues(typeof(TEnum))
                select new { Id = e, Name = e.ToString() };
            return new SelectList(values, "Id", "Name", enumObj);
        }
    }
}

This allows you to write:

ViewData["taskStatus"] = task.Status.ToSelectList();

by using MyApp.Common

Asp.net-mvc – How to render an ASP.NET MVC view as a string

Here's what I came up with, and it's working for me. I added the following method(s) to my controller base class. (You can always make these static methods somewhere else that accept a controller as a parameter I suppose)

MVC2 .ascx style

protected string RenderViewToString<T>(string viewPath, T model) {
  ViewData.Model = model;
  using (var writer = new StringWriter()) {
    var view = new WebFormView(ControllerContext, viewPath);
    var vdd = new ViewDataDictionary<T>(model);
    var viewCxt = new ViewContext(ControllerContext, view, vdd,
                                new TempDataDictionary(), writer);
    viewCxt.View.Render(viewCxt, writer);
    return writer.ToString();
  }
}

Razor .cshtml style

public string RenderRazorViewToString(string viewName, object model)
{
  ViewData.Model = model;
  using (var sw = new StringWriter())
  {
    var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext,
                                                             viewName);
    var viewContext = new ViewContext(ControllerContext, viewResult.View,
                                 ViewData, TempData, sw);
    viewResult.View.Render(viewContext, sw);
    viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
    return sw.GetStringBuilder().ToString();
  }
}

Edit: added Razor code.

Best Answer

Related Solutions

C# – How to create a dropdownlist from an enum in ASP.NET MVC

For MVC v5.1 use Html.EnumDropDownListFor

For MVC v5 use EnumHelper

For MVC 5 and lower

Asp.net-mvc – How to render an ASP.NET MVC view as a string

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