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PODropDownList not working 100% in ASP.Net MVC
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  1. PODropDownList not working 100% in ASP.Net MVC
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    copied!<p>I am quite confused with how to effectively use the Html.DropDownList helper for ASP.NET MVC.</p> <p><strong>Background:</strong> I have a 5-page form, which saves data to the form each time "Next" is clicked. Users may navigate back and forth between sections, so previous sections will already be pre-populated with previously-entered data.</p> <p>This works for TextBoxes. But not DropDownLists. I have tried a load of different methods, including:</p> <ul> <li><a href="https://stackoverflow.com/questions/867117/how-to-add-static-list-of-items-in-mvc-html-dropdownlist/867218#867218">How to add static list of items in MVC Html.DropDownList()</a></li> <li><a href="https://stackoverflow.com/questions/2080802/setting-selected-item-to-dropdownlist-in-mvc-application">Setting selected item to DropdownList in MVC Application?</a></li> </ul> <p>I have a ViewModel such taht I have got my lists and my Model (a LINQ-to-SQL generated class) as properties. eg:</p> <pre><code>public class ConsultantRegistrationFormViewModel { public IConsultantRegistration ConsultantRegistration { get; private set; } public SelectList Titles { get; private set; } public SelectList Countries { get; private set; } public SelectList Currencies { get; private set; } public int CurrentSection { get; private set; } private ConsultantRegistrationFormViewModel(IConsultantRegistration consultantRegistration) { ConsultantRegistration = consultantRegistration; CurrentSection = 1; Titles = new SelectList(new string[] { "Mr", "Mrs", "Miss", "Ms", "Dr", "Sir" }); Countries = new SelectList(countries.Select(q =&gt; q.Name)); Currencies = new SelectList(currencies,"CurrencyCode","FriendlyForm"); } } </code></pre> <p>My Controller's Edit Action on GET looks like:</p> <pre><code>public class ConsultantRegistrationController : Controller { public IConsultantRegistrationRepository ConsultantRegistrationRepository { get; private set; } public ICountryRepository CountryRepository { get; private set; } public IEnumerable&lt;ICountry&gt; Countries { get; private set; } public ConsultantRegistrationController() { ConsultantRegistrationRepository = RepositoryFactory.CreateConsultantRegistrationRepository(); CountryRepository = RepositoryFactory.CreateCountryRepository(); Countries = CountryRepository.GetCountries().ToArray(); } public ActionResult Edit(Guid id, int sectionIndex) { IConsultantRegistration consultantRegistration = ConsultantRegistrationRepository.GetConsultantRegistration(id); SelectList bankBranchCountriesSelectList = new SelectList(Countries, "BankBranchCountry", "CountryName", consultantRegistration.BankBranchCountry); ViewData["bankBranchCountrySelectList"] = bankBranchCountriesSelectList; return View(new ConsultantRegistrationFormViewModel(consultantRegistration,sectionIndex, Countries,Currencies)); } } </code></pre> <p>With my View doing:</p> <pre><code> &lt;%: Html.DropDownList("ConsultantRegistration.BankBranchCountry",ViewData["bankBranchCountrySelectList"] as SelectList) %&gt; </code></pre> <p>This gives me the error:</p> <blockquote> <p>DataBinding: 'IWW.ArrowPay.ConsultantRegistration.Data.Country' does not contain a property with the name 'BankBranchCountry'.</p> </blockquote> <p>Which it does, have a look at the schema of this property:</p> <pre><code>public interface IConsultantRegistration { Guid ID { get; set; } [DisplayName("Branch Country")] string BankBranchCountry { get; set; } } </code></pre> <p>(My LINQ-to-SQL type ConsultantRegistration implemented IConsultantRegistration)</p> <p>It seems that it is trying to bind to the wrong type, though?</p> <p>If I use this in my view (and use my Controller's Countries property):</p> <pre><code> &lt;%: Html.DropDownList("ConsultantRegistration.BankBranchCountry ",Model.Countries,"(select a Country)") %&gt; </code></pre> <p>I get the saved value fine, but my model doesn't update on POST.</p> <p>And if I use this in my view:</p> <pre><code> &lt;%: Html.DropDownListFor(model=&gt;model.ConsultantRegistration.BankBranchCountry ",Model.Countries,"(select a Country)") %&gt; </code></pre> <p>I get the list, and it POSTs the selected value back, but does not pre-select the currently selected item in my model on the view.</p> <p>So I have a bit of the solution all over the place, but not all in one place.</p> <p>Hope you can help fill in my ignorance.</p>
 

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