將項目添加到列表<string>從另一個類c＃

Question

我有3類。這些是places.cs，onePlace.cs和placestovisit.cs。 placestovisit.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 
namespace Sunamganj.ViewModels 
{ 
    public class placestovisit 
    { 
     public bool IsDataLoaded { get; set; } 
     public onePlace sunamganj { get; set; } 
     public static string basePlaces = "Assets/Places/"; 
     private string baseTanguar = basePlaces + "Tanguar/"; 
     private string baseBaruni = basePlaces + "Baruni/"; 

     public void LoadData() 
     { 
      sunamganj = createSunamganj(); 

      IsDataLoaded = true; 
     } 

     private onePlace createSunamganj() 
     { 
      onePlace data = new onePlace(); 

      data.Items.Add(new places() 
      { 
       ID = "0", 
       Title = "Tanguar Haor", 
       shortDescription="Tanguar Haor (Lowlaying marsh) is a complex landscape of over 46 marshes, 30 km Northwest of Sunamgonj District.", 
       itemImage = baseTanguar + "1.jpg", 

       FullDescription = "Tanguar Haor (Lowlaying marsh) is a complex landscape of over 46 marshes, 30 km Northwest of Sunamgonj District. The marshes are inter connected with one another through narrow Channels but merge into a single large water body during monsoon. The aquatic vegetation and less disturbance from the human are instrument to invite a large variety of waterfowl specially winter migrant ducks that congregates in thousands. Resident and local migrant, raptor, waders and passerine birds made the area as one of the Asia's most potential birding place. Tanguar Haor is listed as a Ramsar site under the Ramsar Convention in 2000." 
      }); 
    } 
} 

onePlace.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace Sunamganj.ViewModels 
{ 
    public class onePlace 
    { 
     public string Title { get; set; } 
     public List<places> Items { get; set; } 

     public onePlace() 
     { 
      Items = new List<places>(); 
     } 
    } 
} 

places.cs

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace Sunamganj.ViewModels 
{ 
    public class places 
    { 
     public string ID { get; set; } 
     public string Title { get; set; } 
     public string shortDescription { get; set; } 
     public string FullDescription { get; set; } 
     public string itemImage { get; set; } 
     public List<string>Gallery { get; set; } 

    } 
} 

我想從placestovisit類添加到項目庫。那該怎麼辦？

其實我想爲每個對象添加一個照片庫。但我在OOP方面並不太好。此時此刻我能否理解這個概念或者需要改變這個概念。如果我可以使用這個，那麼我怎樣才能從placestovisit類中添加項目到畫廊？

Answer 1

Gallery只是places類的一個屬性，您可以通過places類的實例訪問該屬性來添加項目。

public class places 
{ 
    public places() 
    { 
     Gallery = new List<string>(); 
    } 
} 

然後你就可以添加新的項目：你應該記住，引用類型的屬性是空默認情況下，所以你需要初始化them.You可以做，在你的構造

一件事

var plc = new places() { /* set the properties */ } 

plc.Gallery.Add("new gallery");