[英]Windows phone 8.1 binding data to XAML from datasource (HUB template)
我需要幫助...
所以從本質上講,我一直在看WP 8.1開發教程,並且有一個使用標准HUB模板的教程。
因此,我嘗試配置此模板供自己使用。 我有一個JSON文件,其中包含我想在頁面上列出的所有我需要的數據(公寓)。 我“重新創建了” SampleDataSource,它在我的應用程序中只是DataSource。 我認為數據一切正常,現在出現了翻譯數據並將其綁定到XAML的問題。 我真的不知道為什么它不起作用,因為我剛剛嘗試更改模板中有效的參數(由SDK提供)。 你們可以幫我還是給我一些指導,在哪里可以找到這樣做的例子。
如果有人願意幫助我或向我提供Skype / TW,只是為了向我展示結構和我必須做的事情,我將不勝感激,因為我那時會知道它的基本翻譯和工作原理,因此我可以從事其他方面的工作。項目! 有比特幣作為獎勵! :)
提前謝謝。
編輯:添加Github存儲庫: https : //github.com/lklancir/zimmerfrei_wp/tree/master/ZimmerFrei_v0.1
這是DataSource.cs :
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Windows.Data.Json;
using Windows.Storage;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Media.Imaging;
命名空間ZimmerFrei.Data {
public class ApartmentData
{
public ApartmentData(String id, String name, String description, String capacity, String stars, String address, String email, String phone, String phone2, String rating, String lat, String lng, String price, String cover_photo, String owner_id, String type_id, String city_id)
{
this.Id = id;
this.Name = name;
this.Description = description;
this.Capacity = capacity;
this.Stars = stars;
this.Address = address;
this.Email = email;
this.Phone = phone;
this.Phone2 = phone2;
this.Rating = rating;
this.Lat = lat;
this.Lng = lng;
this.Price = price;
this.Cover_photo = cover_photo;
this.Owner_id = owner_id;
this.Type_id = type_id;
this.City_id = city_id;
}
public string Id { get; private set; }
public string Name { get; private set; }
public string Description { get; private set; }
public string Capacity { get; private set; }
public string Stars { get; private set; }
public string Address { get; private set; }
public string Email { get; private set; }
public string Phone { get; private set; }
public string Phone2 { get; private set; }
public string Rating { get; private set; }
public string Lat { get; private set; }
public string Lng { get; private set; }
public string Price { get; private set; }
public string Cover_photo { get; private set; }
public string Owner_id { get; private set; }
public string Type_id { get; private set; }
public string City_id { get; private set; }
public override string ToString()
{
return this.Name;
}
}
public sealed class DataSource
{
private static DataSource _dataSource = new DataSource();
private ObservableCollection<ApartmentData> _apartments = new ObservableCollection<ApartmentData>();
public ObservableCollection<ApartmentData> Apartments
{
get { return this._apartments; }
}
public static async Task<IEnumerable<ApartmentData>> GetApartmentsAsync()
{
await _dataSource.GetDataAsync();
return _dataSource.Apartments;
}
public static async Task<ApartmentData> GetApartmentAsync(string id)
{
await _dataSource.GetDataAsync();
var matches = _dataSource.Apartments.Where((apartment) => apartment.Id.Equals(id));
if (matches.Count() == 1) return matches.First();
return null;
}
private async Task GetDataAsync()
{
if (this._apartments.Count != 0)
return;
Uri dataUri = new Uri("ms-appx:///DataModel/Apartments.json");
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(dataUri);
string jsonText = await FileIO.ReadTextAsync(file);
JsonObject jsonObject = JsonObject.Parse(jsonText);
JsonArray jsonArray = jsonObject["apartments"].GetArray();
foreach (JsonValue apartmentValue in jsonArray)
{
JsonObject apartmentObject = apartmentValue.GetObject();
ApartmentData apartment = new ApartmentData(apartmentObject["Id"].GetString(),
apartmentObject["Name"].GetString(),
apartmentObject["Description"].GetString(),
apartmentObject["Capacity"].GetString(),
apartmentObject["Stars"].GetString(),
apartmentObject["Address"].GetString(),
apartmentObject["Email"].GetString(),
apartmentObject["Phone"].GetString(),
apartmentObject["Phone2"].GetString(),
apartmentObject["Rating"].GetString(),
apartmentObject["Lat"].GetString(),
apartmentObject["Lng"].GetString(),
apartmentObject["Price"].GetString(),
apartmentObject["Cover_photo"].GetString(),
apartmentObject["Owner_id"].GetString(),
apartmentObject["Type_id"].GetString(),
apartmentObject["City_id"].GetString());
this.Apartments.Add(apartment);
}
}
}
}
這是ListPage.xaml (我想在其中寫出數據)
<Page
x:Class="ZimmerFrei_v0._1.ListPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:ZimmerFrei_v0._1"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:data="using:ZimmerFrei.Data"
DataContext="{Binding DefaultViewModel, RelativeSource={RelativeSource Self}}"
d:DataContext="{Binding Source={d:DesignData Source=/DataModel/Apartments.json, Type=data:DataSource}}"
mc:Ignorable="d" FontFamily="Global User Interface">
<Page.Resources>
<DataTemplate x:Key="StandardTripleLineItemTemplate">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto"/>
<ColumnDefinition Width="*"/>
</Grid.ColumnDefinitions>
<Border Background="{ThemeResource ListViewItemPlaceholderBackgroundThemeBrush}" Margin="0,9.5,0,0" Grid.Column="0" HorizontalAlignment="Left">
<Image Source="{Binding Cover_photo}" Stretch="UniformToFill" AutomationProperties.Name="{Binding Title}" Height="79" Width="79"/>
</Border>
<StackPanel Grid.Column="1" Margin="14.5,0,0,0">
<TextBlock Text="{Binding Name}" Style="{ThemeResource ListViewItemTextBlockStyle}" FontFamily="Global User Interface"/>
<TextBlock Text="{Binding Description}" Style="{ThemeResource ListViewItemContentTextBlockStyle}" Foreground="{ThemeResource PhoneMidBrush}" FontFamily="Global User Interface" />
<TextBlock Text="{Binding Stars}" Style="{ThemeResource ListViewItemSubheaderTextBlockStyle}" />
</StackPanel>
</Grid>
</DataTemplate>
</Page.Resources>
<Grid x:Name="LayoutRoot">
<Hub x:Name="Hub" x:Uid="Hub" Header="ZimmerFrei">
<HubSection x:Uid="HubSection" Header="APARTMENTS"
DataContext="{Binding Apartments}" >
<DataTemplate>
<ListView
AutomationProperties.AutomationId="ItemListViewSection3"
AutomationProperties.Name="Items In Group"
SelectionMode="None"
IsItemClickEnabled="True"
ItemsSource="{Binding apartment}"
ItemTemplate="{StaticResource StandardTripleLineItemTemplate}"
ItemClick="ItemView_ItemClick"
ContinuumNavigationTransitionInfo.ExitElementContainer="True">
</ListView>
</DataTemplate>
</HubSection>
</Hub>
</Grid>
這里有一些問題:
ApartmentData
類具有一些名為Cover_photo
屬性。 這通常不是C#使用的樣式約定,因此我將它們重命名為CoverPhoto
。 在同一主題上,您的ApartmentData
屬性的名稱類似於Cover_photo
但在JSON(這是典型的JSON樣式)中,它們的名稱類似於cover_photo
。 您正在像這樣訪問JSON鍵:
apartmentObject["Cover_photo"].GetString() // KeyNotFoundException
但應該是:
apartmentObject["cover_photo"].GetString()
這將在運行時工作, 但設計人員將不會執行此代碼。 設計器將讀取JSON文件,並嘗試將JSON文件中的鍵與您指定的類型的屬性進行匹配,但是由於鍵和屬性不匹配,因此無法執行。 所以你要么:
CoverPhoto
之類的屬性。 DataContractAttribute
注釋您的類型。 這使您可以使用DataMemberAttribute
指定JSON和.NET類型之間的映射,但這主要是因為您獲得了JSON序列化/反序列化! 我向您發送了包含這些更改的請求請求。 此外,您的設計數據非常龐大(〜1000個項目!)。 它只能包含約5個項目,因為無論如何您將無法在設計器中看到所有項目。
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