[英]How can i bind xml to mvvm wpf?
我有個問題。 我有wpf mvvm應用程序,需要綁定xml,但我不知道如何。
我有元素模型,元素vm和視圖。 一切正常,但是所有這些元素都具有“某些基礎”模型。
class ItemModel
{
public ItemModel(string name, double weight, double sg, double volume)
{
Name = name;
Weight = weight;
Sg = sg;
Volume = volume;
}
public string Name { get; set; }
public double Weight { get; set; }
public double Sg { get; set; }
public double Volume { get; set; }
}
這是我的虛擬機。
class ItemViewModel : BaseVM
{
public ItemViewModel(string name, double sg, double weight, double volume)
{
Name = name;
Weight = weight;
Sg = sg;
Volume = volume;
}
public string Name { get; set; }
private double _weight;
public double Weight
{
get => _weight;
set
{
_weight = value;
RaisePropertyChanged();
}
}
private double _sg;
public double Sg
{
get => _sg;
set
{
_sg = value;
Weight = value * _volume;
RaisePropertyChanged("Weight");
RaisePropertyChanged("Sg");
}
}
private double _volume;
public double Volume
{
get => _volume;
set
{
_volume = value;
_weight = value * _sg;
RaisePropertyChanged();
RaisePropertyChanged("Weight");
RaisePropertyChanged("Sg");
}
}
}
這是我的MainVM
class MainViewModel
{
private DataModel Data;
public ObservableCollection<ItemViewModel> Items { get; set; }
public ListCollectionView FilteredItems { get; set; }
public MainViewModel()
{
Data = new DataModel();
Items = new ObservableCollection<ItemViewModel>();
FilteredItems = new ListCollectionView(Items)
{
Filter = item => ((ItemViewModel)item).Volume != 0,
IsLiveFiltering = true,
LiveFilteringProperties =
{
nameof (ItemViewModel.Volume)
}
};
Load();
}
public void Load()
{
foreach (var item in Data.GetItems())
Items.Add(new ItemViewModel(item.Name, item.Weight, item.Sg, item.Volume));
}
}
我有一些“ DataModel”
class DataModel
{
public List<ItemModel> GetItems() =>
new List<ItemModel>
{
new ItemModel("Water", 0.00, 1.025, 0.00),
new ItemModel("Ballast", 0.00, 1.000, 0.00),
new ItemModel("Oil", 0.00, 1.040, 0.00),
};
}
這是我想綁定的xml。
<ballast>
<tank ID="FPTW" Name="Forepeak" Weight="0.00" SG="1.025" Volume="0.00"> </tank>
</ballast>
請幫助我如何綁定此xml文件,而不是在DataModel中列出。
我強烈建議您將XML反序列化為“真實”對象。 在您的示例中,您希望在程序中有一個坦克清單。 視圖(XAML)不應該知道“數據存儲”是xml文件,數據庫還是其他。 只需綁定到TankViewModel
的列表TankViewModel
(或者,在您的情況下,您將其命名為ItemViewModel
。希望您不要對所有這些坦克都TankViewModel
。
這是您將xml反序列化為“真實”對象的方式(完整的工作控制台應用程序:
https://dotnetfiddle.net/zCHSmc
using System;
using System.IO;
using System.Xml.Serialization;
using System.Collections.Generic;
public class Program
{
public static void Main()
{
MainViewModel vm = new MainViewModel();
foreach(tank t in vm.ListOfTanks.ballast)
{
Console.WriteLine(t.ID);
}
}
public class MainViewModel
{
public tanks ListOfTanks
{
get
{
string xmlContent = "<?xml version=\"1.0\" encoding=\"utf-16\"?><tanks xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\"> <ballast><tank><ID>ksj</ID></tank> </ballast></tanks>";
tanks allTanks = null;
XmlSerializer serializer = new XmlSerializer(typeof(tanks));
//if you have a xml file you can use serializer.Deserialize("yourFile.xml"); instead of the "in memory stream"
using (TextReader reader = new StringReader(xmlContent))
{
allTanks =(tanks)serializer.Deserialize(reader);
}
return allTanks;
}
}
}
public class tanks
{
public tanks()
{
ballast = new List<tank>();
}
public List<tank> ballast {get;set;}
}
public class tank
{
public string ID {get;set;}
}
}
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