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你好，感谢你的时间。动态添加元素来查看基于xml解析的viewmodel
我正在为学校制作一个项目，而且我遇到了一个id想要在周末解决的问题。 （我的老师显然没有问题）
我正在为我的应用程序使用MVVM架构。 我希望动态地添加堆栈面板（有一些内容）的视图，基于多少条目的选定的类别，我发现在相关的XML文件中的ViewModel我已经创建了一个XMLContainer类，它使用单身模式。 我有一个名为“类别”与可用类别的枚举。 我有一个ViewModel叫'SecondPageViewModel'
我只有这样做了2个月，所以即使你认为它明显是什么意思。详细一点更请:)
我的工具： Visual Studio的终极2013 ReSharper的8
分类枚举：
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类：
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，谢谢你的时间
将XML反序列化为POCO，这些是您的模型。将它们存储在虚拟机的属性中。绑定你的用户界面到这些，使用DataTemplates显示对应于每种类型的用户界面。现在你已经完成了。 – Will 2014-10-31 15:00:02
我解决了数据绑定到GridView元素的问题。我喜欢发布我的代码供他人阅读。但我没有选择添加答案 – 2014-10-31 21:17:58