The model item passed into the dictionary is of type 'requires a model item of type 'System.Collections.Generic.IEnumerable`

Question

I have created a web application in mvc3 and created two partial views one having controls like dropdownlist. second having webgrid which shows data from database.

partialview1.cshtml
@model Mapping.Models.SecurityIdentifierMapping

@using (Html.BeginForm("Mapping", "Home"))
{
    @Html.DropDownList("SecurityID", Model.PricingSecurityID, "-- Select SecurityID --")
    <br />    
    @Html.DropDownList("CUSIPID", Model.PricingSecurityID, "-- Select CUSIPID --")
    <br />
    <button type="submit">Map</button>
}

partialview2.cshtml
@model IEnumerable<Mapping.Models.SecurityIdentifierMapping>

@{
    ViewBag.Title = "Mapping";
    WebGrid grid = null;
    if (Model.Count() > 0 ){
    grid = new WebGrid(source: Model,
                            defaultSort: "Id",
                            canPage: true,
                            canSort: true,
                            rowsPerPage:20);
    }
}


<h2>Mapping</h2>


@if (grid != null)
{
@grid.GetHtml(
                tableStyle: "grid",
                headerStyle: "head",
                alternatingRowStyle: "alt",
                columns: grid.Columns(
                                            grid.Column("", header: null, format: @<text>@Html.ActionLink("Edit", "Edit", new { id = (int)item.id })  @Html.ActionLink("Delete", "Delete", new { id = (int)item.id })</text>),
                                            grid.Column("PricingSecurityID"),
                                            grid.Column("CUSIP")
                                          )

                )
}
<br />
<p>
    @Html.ActionLink("Back", "Index")
</p>

in index.cshtml


<div>
@Html.Partial("_ControlsPartial",)
</div>

<div>
@Html.Partial("_WebGridPartial")
</div>

HomeController.cs
  public ActionResult Index()
        {
            SecurityIdentifierMapping objModel = new SecurityIdentifierMapping();
            objModel.PricingSecurityID = objRepository.GetPricingSecurityID();
            objModel.CUSIP = objRepository.GetCUSIP();
            return View(objModel);

        }

How can i show webgrid and populate dropdown with same Index()??

getting error :( what should be 2nd parameter inside @Html.Partial() so that both grid and control works fine on same page.?

Answer 1

You are passing a SecurityIdentifierMapping model to the Index view. Inside this Index view you are calling 2 partials:

@Html.Partial("_ControlsPartial")

and:

@Html.Partial("_WebGridPartial")

The first one works fine because it is strongly typed to SecurityIdentifierMapping but the second one (the one with the grid) doesn't work because it is strongly typed to IEnumerable<SecurityIdentifierMapping> . Thus the exception you are getting.

I would recommend you using a view model which will contain 2 properties: one simple SecurityIdentifierMapping that you could pass to the first partial and an IEnumerable<SecurityIdentifierMapping> property that you will pass to the second partial. It is the controller action that will fill this view model and pass it to the Index view:

Index.cshtml :

@model MyViewModel

<div>
    @Html.Partial("_ControlsPartial", Model.SecurityIdentifier)
</div>

<div>
    @Html.Partial("_WebGridPartial", Model.Identifiers)
</div>