0
你好，感謝你的時間。動態添加元素來查看基於xml解析的viewmodel
我正在爲學校製作一個項目，而且我遇到了一個id想要在週末解決的問題。 （我的老師顯然沒有問題）
我正在爲我的應用程序使用MVVM架構。 我希望動態地添加堆棧面板（有一些內容）的視圖，基於多少條目的選定的類別，我發現在相關的XML文件中的ViewModel我已經創建了一個XMLContainer類，它使用單身模式。 我有一個名爲「類別」與可用類別的枚舉。 我有一個ViewModel叫'SecondPageViewModel'
我只有這樣做了2個月，所以即使你認爲它明顯是什麼意思。詳細一點更請:)
我的工具： Visual Studio的終極2013 ReSharper的8
分類枚舉：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace TouristAppV3.Enums
{
enum Categories
{
Bars,
Festivals,
Hotels,
Museums,
Restaurants,
}
}
XMLContainer類：
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml.Linq;
using Windows.ApplicationModel;
using Windows.Media.MediaProperties;
using Windows.Storage;
using TouristAppV3.Enums;
namespace TouristAppV3.Classes
{
/// <summary>
/// This class uses the singleton pattern.
/// Use GetInstance() to use the class
/// </summary>
class XMLContainer
{
private static XMLContainer _object;
private IEnumerable<XElement> BarsXML;
private IEnumerable<XElement> HotelsXML;
private IEnumerable<XElement> MuseumsXML;
private IEnumerable<XElement> RestaurantsXML;
private IEnumerable<XElement> FestivalsXML;
private XMLContainer()
{
GetBars();
GetFestivals();
GetHotels();
GetMuseums();
GetRestaurants();
}
/// <summary>
/// Usage: XMLContainer "desired name" = XMLContainer.GetInstance()
/// </summary>
/// <returns>The same object every time.</returns>
public static XMLContainer GetInstance()
{
if (_object == null)
{
_object = new XMLContainer();
}
return _object;
}
/// <summary>
/// Returns the XML for the requested category
/// </summary>
/// <param name="desiredCategory">The desired category</param>
/// <returns>ienumerable xelement</returns>
public IEnumerable<XElement> ReturnXMLFrom(Categories desiredCategory)
{
switch (desiredCategory)
{
case Categories.Bars:
return BarsXML;
case Categories.Hotels:
return HotelsXML;
case Categories.Festivals:
return FestivalsXML;
case Categories.Museums:
return MuseumsXML;
case Categories.Restaurants:
return RestaurantsXML;
}
return null;
}
private void GetBars()
{
GetXML(Categories.Bars);
}
private void GetHotels()
{
GetXML(Categories.Hotels);
}
private void GetMuseums()
{
GetXML(Categories.Museums);
}
private void GetRestaurants()
{
GetXML(Categories.Restaurants);
}
private void GetFestivals()
{
GetXML(Categories.Festivals);
}
/// <summary>
/// Gets the content of the xml file associated with the selected category
/// </summary>
/// <param name="selectedCategory"></param>
private async void GetXML(Categories selectedCategory)
{
string _selectedCategory = selectedCategory.ToString();
StorageFile categoryFile = null;
StorageFolder installationFolder = Package.Current.InstalledLocation;
string xmlPath = @"Assets\xml\Models\" + _selectedCategory + ".xml";
categoryFile = await installationFolder.GetFileAsync(xmlPath);
Stream categoryStream = await categoryFile.OpenStreamForReadAsync();
XDocument categoryXDocument = XDocument.Load(categoryStream);
categoryStream.Dispose();
IEnumerable<XElement> returnThis = categoryXDocument.Descendants(_selectedCategory.Remove(_selectedCategory.Count() - 1).ToLower());
switch (_selectedCategory)
{
case "Bars":
BarsXML = returnThis;
break;
case "Hotels":
HotelsXML = returnThis;
break;
case "Restaurants":
RestaurantsXML = returnThis;
break;
case "Museums":
MuseumsXML = returnThis;
break;
case "Festivals":
FestivalsXML = returnThis;
break;
}
}
}
}
SecondPageViewModel：
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.IO;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Linq;
using Windows.ApplicationModel;
using Windows.Storage;
using Windows.UI.Core;
using TouristAppV3.Annotations;
using TouristAppV3.Classes;
using TouristAppV3.Enums;
namespace TouristAppV3.ViewModel
{
class SecondPageViewModel : INotifyPropertyChanged
{
private IEnumerable<XElement> xml;
private string _selectedCategory = MainPageViewModel.SelectedCategory;
public SecondPageViewModel()
{
LoadXML();
}
private void LoadXML()
{
XMLContainer xmlContainer = XMLContainer.GetInstance();
switch (_selectedCategory)
{
case "Bars":
xml = xmlContainer.ReturnXMLFrom(Categories.Bars);
break;
case "Hotels":
xml = xmlContainer.ReturnXMLFrom(Categories.Hotels);
break;
case "Restaurants":
xml = xmlContainer.ReturnXMLFrom(Categories.Restaurants);
break;
case "Museums":
xml = xmlContainer.ReturnXMLFrom(Categories.Museums);
break;
case "Festivals":
xml = xmlContainer.ReturnXMLFrom(Categories.Festivals);
break;
}
}
public event PropertyChangedEventHandler PropertyChanged;
[NotifyPropertyChangedInvocator]
protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null) handler(this, new PropertyChangedEventArgs(propertyName));
}
}
}
再一次，謝謝你的時間
將XML反序列化爲POCO，這些是您的模型。將它們存儲在虛擬機的屬性中。綁定你的用戶界面到這些，使用DataTemplates顯示對應於每種類型的用戶界面。現在你已經完成了。 – Will 2014-10-31 15:00:02
我解決了數據綁定到GridView元素的問題。我喜歡發佈我的代碼供他人閱讀。但我沒有選擇添加答案 – 2014-10-31 21:17:58