mvc checkboxes selection

Question

Hi

I am working with checkboxes in MVC.I have a table with one clolumn as "bit" type.The following code giving me error

 [HttpPost]

 public string Index(IEnumerable<City> cities)

if (cities.Count(x => x.Chosen) == 0)

 return "You did not select any city";

Chosen is a bit type here. and when i am trying to build it says "

Cannot implicitly convert type 'bool?' to 'bool'. An explicit conversion exists (are you missing a cast?)

Vinay Singh · Answer

Hi A checkbox needs to have a value (After all it can only be in one of two states checked or unchecked true or false). Why can't you just make isActive a bool since it's just the view model. In your model you can keep isActive as a nullable. When you create the view model just check to see if the model's isActive is null and if so set the view model's isActive to false. Another alternative is to not use the strongly typed helper which expects a bool and just use Html.CheckBox like so Try the below code @ Html . CheckBox ( IsActive  Model . IsActive . HasValue ? Model . IsActive : false )

Manas Mohapatra · Answer

Follow below link: http://forums.asp.net/t/1794010.aspx?convert+type+bool+to+bool+for+a+Html+CheckBoxFor

Ajay Malik · Answer

consider this code model public class MerchantModel { public int AppId{ get ; set ;} public string Name{ get ; set ;} public bool IsSelected{ get ; set ;} } public class MerchantViewModel { public List Merchants{ get ; set ;} } controller //GET:Default public ActionResultIndex() { varmerchant1= new MerchantModel { AppId=1 Name= Bob }; varmerchant2= new MerchantModel { AppId=2 Name= Ted }; varmerchant3= new MerchantModel { AppId=3 Name= Alice }; List list= new List (); list.Add(merchant1); list.Add(merchant2); list.Add(merchant3); varmodel= new MerchantViewModel { Merchants=list }; return View(model); } [HttpPost] public ActionResultIndex(MerchantViewModelmodel) { return View(model); } } view viewport content= width=device-width /> Index /default/index method= post > @ for ( int i=0;i { @Html.CheckBoxFor(x=>x.Merchants[i].IsSelected) @Html.HiddenFor(x=>x.Merchants[i].AppId) @Model.Merchants[i].AppId @Html.HiddenFor(x=>x.Merchants[i].Name) @Model.Merchants[i].Name } submit >Submit