ASP.NET MVC 2 : Having trouble with creating a Master-Detail View

Answer 1

It appears you are calling the same render partial method twice, passing it once with the datatype CategoryDescription and another time passing it a model with type IEnumerable<CategoryDescription>. Have you tried commenting out the one that does not pass the correct data type for the view?

Try something like this:

<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<InnVue.Globe.Models.CategoryModel>" %>
    <%@ Import Namespace="InnVue.Globe.Models" %>

    <asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
        <%: ViewContext.RouteData.Values["Action"] %> Category
    </asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">

    <h2><%: ViewContext.RouteData.Values["Action"] %> Category</h2>

    <% Html.EnableClientValidation(); %>
    <% using (Html.BeginForm()) {%>
        <%: Html.ValidationSummary(true) %>

        <fieldset>
            <legend>CategoryDescription</legend>
            <% foreach (var catdes in Model.CategoryDescriptions) { %>
                <% Html.RenderPartial("CategoryDescriptions", catdes); %>
            <% } %>

            <p>
                <input type="submit" value="Save" />
            </p>
        </fieldset>
    <% } %>

    <div>
        <%: Html.ActionLink("Back to List", "Index") %>
    </div>

</asp:Content>

And use this as your partial view:

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl<InnVue.Globe.Models.CategoryModel>" %>

<%: Html.EditorFor(m => m) %>