MVC3 DropDownListFor - a simple example

Question

I m having trouble with DropDownListFor in my MVC3 app    I was able to use StackOverflow to figure out how to get them to appear on the View  but now I don t know how to capture the values in its corresponding properties on the View Model when it s submitted   In order to get this to work I had to create an inner class that had an ID and a value property  then I had to use an IEnumerable lt Contrib gt  to satisfy the DropDownListFor parameter requirements    Now  however  how is MVC FW supposed to map the value that is selected on this drop-down back into the simple string property on my view model    public class MyViewModelClass       public class Contrib               public int ContribId   get  set            public string Value   get  set               public IEnumerable lt Contrib gt  ContribTypeOptions            new List lt Contrib gt                        new Contrib  ContribId   0  Value    Payroll Deduction                new Contrib  ContribId   1  Value    Bill Me                    DisplayName  Contribution Type        public string ContribType   get  set        In my View I place the dropdown on the page like this    lt div class  editor-label  gt       Html LabelFor m   gt  m ContribType   lt  div gt   lt div class  editor-field  gt       Html DropDownListFor m   gt  m ContribTypeOptions First   ContribId                new SelectList Model ContribTypeOptions   ContribId    Value     lt  div gt    When I submit the form the ContribType is  of course  null    What is the correct way to do this

User · Accepted Answer

You should do like this    Html DropDownListFor m   gt  m ContribType                   new SelectList Model ContribTypeOptions                                   ContribId    Value      Where   m   gt  m ContribType   is a property where the result value will be

User · Answer

I think this will help   In Controller get the list items and selected value  public ActionResult Edit int id        ItemsStore item   itemStoreRepository FindById id       ViewBag CategoryId   new SelectList categoryRepository Query   Get                                              Id    Name  item CategoryId           ViewBag to pass values to View and SelectList        get list of items valuefield textfield selectedValue       return View item       and in View   Html DropDownList  CategoryId  String Empty

User · Answer

Html DropDownListFor m   gt  m SelectedValue Your List  ID   Values     Here Value is that object of model where you want to save your Selected Value

User · Answer

For binding Dynamic Data in a DropDownList you can do the following   Create ViewBag in Controller like below  ViewBag ContribTypeOptions   yourFunctionValue      now use this value in view like below    Html DropDownListFor m   gt  m ContribType       new SelectList  ViewBag ContribTypeOptions   ContribId                        Value   Model ContribTypeOptions First   ContribId         Select  please

[c#] MVC3 DropDownListFor - a simple example?

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