Populating Nested List<> in MVC4 C# - asp.net-mvc-4

Question

I've got a problem populating nested List<>
The object graph looks like this:
Route ⇒ Section ⇒ Co-ordinates
Whenever I try to populate Сoordinates list it just overwrites previous record and at the end gives me only the last Coordinate record. But I want all the Co-ordinates.
Here is my controller code:
List<RequestRouteDataClass> result = new List<RequestRouteDataClass> {
new RequestRouteDataClass() {
RouteRequestId = objRouteManagement.RouteRequestId,
RouteName = objRouteManagement.RouteName,
RouteDescription = objRouteManagement.RouteDescription,
RouteSections = new List<RouteSections> {
new RouteSections() {
Route_Sections_Id = objSections.Route_Sections_Id,
Section_Speed = objSections.Section_Speed,
Section_Description = objSections.Section_Description,
RouteCordinatesSections = new List<SectionCoordinatesRelationData> {
new SectionCoordinatesRelationData() {
SectionCoordinate_Relat_Id = objSectionsCordinates.SectionCoordinate_Relat_Id,
CoordinateLat = objSectionsCordinates.CoordinateLat,
CoordinateLag = objSectionsCordinates.CoordinateLag
}
}
}
}
}

Answer 1

If you want to use Nested List.
Your Model Contains =>
public class MainModelToUse
{
public MainModelToUse()
{
FirstListObject = new List<FirstListClass>();
}
public List<FirstListClass> FirstListObject { get; set; }
}
public class FirstListClass
{
public FirstListClass()
{
SecondListObject = new List<SecondListClass>();
}
public List<SecondListClass> SecondListObject { get; set; }
}
public class SecondListClass
{
public SecondListClass()
{
ThirdListObject = new List<ThirdListClass>();
}
public List<ThirdListClass> ThirdListObject { get; set; }
}
public class ThirdListClass
{
}
Your Code to Nested List =>
FirstListClass vmFirstClassMenu = new FirstListClass();
vmFirstClassMenu.SecondListClass = new List<SecondListClass>();
FirstListClass vmFirstClassCategory = new FirstListClass();
var dataObject1 = //Get Data By Query In Object;
foreach (Model objModel in dataObject1)
{
vmFirstClassCategory = new FirstListClass
{
//Your Items
};
var DataObject2 = //Get Data By Query In Object;
vmFirstClassCategory.SecondListClass = new List<SecondListClass>();
foreach (SecondListClass menuItem in DataObject2)
{
SecondListClass vmFirstClassMenuItem = new SecondListClass
{
//Your Items
};
var DataObject3 = //Get Data By Query In Object;
vmFirstClassMenuItem.ThirdListClass = new List<ThirdListClass>();
foreach (ThirdListClass price in DataObject3)
{
ThirdListClass vmThirdClassobj = new ThirdListClass
{
//Your Items
};
vmFirstClassMenuItem.ThirdListClass.Add(vmThirdClassobj);
}
vmFirstClassCategory.SecondListClass.Add(vmFirstClassMenuItem);
}
}
Hope this is what you are looking for.

Answer 2

First off: spacing helps with readability (edit: but I see you fixed that in your question already):
List<RequestRouteDataClass> result = new List<RequestRouteDataClass>
{
new RequestRouteDataClass()
{
RouteRequestId = objRouteManagement.RouteRequestId,
RouteName = objRouteManagement.RouteName,
RouteDescription = objRouteManagement.RouteDescription,
RouteSections = new List<RouteSections>
{
new RouteSections()
{
Route_Sections_Id = objSections.Route_Sections_Id,
Section_Speed = objSections.Section_Speed,
Section_Description = objSections.Section_Description,
RouteCordinatesSections = new List<SectionCoordinatesRelationData>
{
new SectionCoordinatesRelationData()
{
SectionCoordinate_Relat_Id = objSectionsCordinates.SectionCoordinate_Relat_Id,
CoordinateLat = objSectionsCordinates.CoordinateLat,
CoordinateLag =objSectionsCordinates.CoordinateLag
}
}
}
}
}
};
Next: what you are doing with the above is initiating your lists with a single element in each list. If you want more elements, you have to add them. I recommend using a foreach and the Add() functionality to fill your lists.
From your example it is not clear how your source data is stored, but if you have multiples of something I would expect those too to be in a list or an array of some kind.