Proper submission of forms with autogenerated controls - asp.net-mvc

Question

Based on:
MVC Html.CheckBox and form submit issue
Let's consider following example. View:
<% using(Html.BeginForm("Retrieve", "Home")) %>
<% { %>
<%foreach (var app in newApps) { %>
<tr>
<td><%=Html.CheckBox(""+app.ApplicationId )%></td>
</tr>
<%} %>
<input type"submit"/>
<% } %>
Controller:
List<app>=newApps; //Database bind
for(int i=0; i<app.Count;i++)
{
var checkbox=Request.Form[""+app[i].ApplicationId];
if(checkbox!="false")// if not false then true,false is returned
}
Proposed solution was about manual parsing of Request.Form that seems for me out of MVC concept. It makes the problem while unit testing of this controller method. In this case I need to generate mock Request.Form object instead of some ViewModel passed as input param.
Q: Is there some other solution of submitting forms like this, so that ViewModel object, containing collection of submitted controls, passed as input param to controller method?
For example:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Retrieve(AppList[] applist)
or
public ActionResult Retrieve(AppList<App> applist)
etc

Answer 1

Controller:
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Retrieve(AppList[] applist)
View:
<% using(Html.BeginForm("Retrieve", "Home")) %> { %>
<%foreach (var app in newApps) { %>
<tr>
<td><%=Html.CheckBox(String.Format("appList[{0}].AProperty", app.ApplicationId) %></td>
</tr>
<% } %>
<input type"submit" />
<% } %>
Read this: Scott Hanselman's ComputerZen.com - ASP.NET Wire Format for Model Binding to Arrays, Lists, Collections, Dictionaries
UPDATED:
If ApplicationId is a key from DB it is better to use AppList<App> as Action parameter. Then your form would be looking as:
<% using(Html.BeginForm("Retrieve", "Home")) %> { %>
<% var counter = 0; %>
<% foreach (var app in newApps) { %>
<tr>
<td><%=Html.CheckBox(String.Format("appList[{0}].Key", counter), app.ApplicationId) %></td>
<!-- ... -->
<td><%=Html.Input(String.Format("appList[{0}].Value.SomeProperty1", counter), app.SomeProperty1) %></td>
<td><%=Html.Input(String.Format("appList[{0}].Value.SomePropertyN", counter), app.SomePropertyN) %></td>
<% counter = counter + 1; %>
</tr>
<% } %>
<input type"submit" />
<% } %>