使用如下所示的Resturent模型，我正在检索数据以具有两个列的列表的形式显示在列表视图中
模型
public class ResturentItems
{
[JsonProperty("Resturent")]
public List<Resturent> Resturent { get; set; }
}
public class Resturent : ModelBase
{
[JsonIgnore]
private static readonly ILocalFileToBase64StringConverter _base64Converter = DependencyService.Get<ILocalFileToBase64StringConverter>();
[JsonProperty("ID")]
public string ID { get; set; }
[JsonProperty("Category")]
public string Category { get; set; }
[JsonProperty("Name")]
public string Name { get; set; }
[JsonProperty("Code")]
public string Code { get; set; }
[JsonProperty("Description")]
public string Description { get; set; }
[JsonProperty("Price")]
public string Price { get; set; }
[JsonProperty("isservicecharge")]
public bool isservicecharge { get; set; }
[JsonProperty("isaddonapplicable")]
public bool isaddonapplicable { get; set; }
[JsonProperty("CostPrice")]
public string CostPrice { get; set; }
[JsonProperty("Date")]
public string Date { get; set; }
[JsonProperty("Image")]
public string Image { get; set; }
[JsonIgnore]
public ImageSource ImageSource => string.IsNullOrEmpty(Image) ? "userpic.jpg" : ImageSource.FromStream(() => new MemoryStream(_base64Converter.ConvertBack(Image)));
}
，并通过以下代码检索数据
private List<ResturentPair> GetDishItems(List<Resturent> list)
{
var res = new List<ResturentPair>();
for (int i = 0; i < list.Count-1; i += 2)
{
res.Add(new ResturentPair { Item1 = list[i], Item2 = list[i+1] });
}
return res;
}
为方便起见，我也会在模型下方显示
public class ResturentPair
{
public Resturent Item1 { get; set; }
public Resturent Item2 { get; set; }
}
因此，最后，餐厅详细信息随名称和类别ETC一起出现，但我的要求我只想显示类别（餐厅项目列表需要列为类别，因此任何想法都只能检索仅按餐厅商品的类别列出??谢谢您的支持
以下有关视图模型的完整代码
public class RootViewModel : ContextViewModelBase
{
private readonly IRestService _restService;
private RootPage _page;
public RootViewModel(IAppContext context, IRestService restService, IStatusBarService statusBarService) : base(context)
{
_restService = restService;
statusBarService.ShowStatusBar();
statusBarService.SetDefaultFontColor();
ActionCommand = new Command(OnActionCommand);
PageAppearingCommand = new Command<RootPage>(OnPageAppearingCommand);
PageDisappearingCommand = new Command(OnPageDisappearingCommand);
}
public List<ResturentPair> Items { get; set; }
public List<Resturent> CarouselItems { get; set; }
public string Photo { get; set; } = "Photo.png";
public bool IsLoading { get; set; } = true;
public ICommand ActionCommand { get; }
public string PagingText { get; set; }
private async void OnPageAppearingCommand(RootPage page)
{
_page = page;
Photo = $"{DefaultValues.ServerUrl}{Context.User.PhotoUrl}";
IsLoading = true;
var items = await _restService.GetFoodMenuInfo();
CarouselItems = GetCarouselItems(items.Resturent);
Items = GetDishItems(items.Resturent);
OnCarouselViewItemSelected(this, new SelectedItemChangedEventArgs(CarouselItems.First())); // we call it for setting paging
IsLoading = false;
_page.CarouselView.ItemSelected += OnCarouselViewItemSelected;
}
private void OnPageDisappearingCommand()
{
_page.CarouselView.ItemSelected -= OnCarouselViewItemSelected;
}
private List<Resturent> GetCarouselItems(List<Resturent> items)
{
var carouselViewItems = new List<Resturent>();
// put your logic here for selecting items for carouselView
for (var i = 0; i < 4; i++)
{
carouselViewItems.Add(items[i]);
}
return carouselViewItems;
}
private List<ResturentPair> GetDishItems(List<Resturent> list)
{
var res = new List<ResturentPair>();
for (int i = 0; i < list.Count-1; i += 2)
{
res.Add(new ResturentPair { Item1 = list[i], Item2 = list[i+1] });
}
return res;
}
private void OnCarouselViewItemSelected(object sender, SelectedItemChangedEventArgs e)
{
var selectedIndex = CarouselItems.IndexOf(e.SelectedItem as Resturent);
var pagingResult = string.Empty;
for (var i = 0; i < CarouselItems.Count; i++)
{
if (i == selectedIndex)
{
pagingResult += $" \uf26d ";
}
else
{
pagingResult += $" \uf26c ";
}
}
PagingText = pagingResult;
}
private void OnActionCommand()
{
Navigator.PushAsync<SettingsViewModel>();
}
}
以下是用于API调用的示例json
{
"Resturent": [
{
"ID": "12238000003927",
"Category": "LEAF TEA_PRE",
"Name": "LT 100G COP",
"Code": "80067-012",
"Description": "LT 100G COP",
"Price": "140.000",
"isservicecharge": 0,
"isaddonapplicable": 0,
"CostPrice": ".000",
"Date": "12228000000000",
"Image": ""
},
{
"ID": "12238000004015",
"Category": "LEAF TEA_PRE",
"Name": "LEAF TEA 200g PREMIUM",
"Code": "80033-024",
"Description": "LEAF TEA 200g\/24 PREMIUM (PILLOW PACK)",
"Price": "310.000",
"isservicecharge": 0,
"isaddonapplicable": 0,
"CostPrice": ".000",
"Date": "12228000000000",
"Image": ""
},
{
"ID": "12238000006325",
"Category": "TEA BAGS_PRE",
"Name": "PREMIUM TAG TBAG 050 ",
"Code": "80021-024",
"Description": "TAG TBAG 050\/2.0g\/24 PREMIUM",
"Price": "240.000",
"isservicecharge": 0,
"isaddonapplicable": 0,
"CostPrice": ".000",
"Date": "12228000000000",
"Image": ""
},
{
"ID": "12238000006192",
"Category": "TEA BAGS_PRE",
"Name": "TAG TBAG 025 PREMIUM",
"Code": "80011-012",
"Description": "TAG TBAG 025\/2.0g\/12 PREMIUM",
"Price": "125.000",
"isservicecharge": 0,
"isaddonapplicable": 0,
"CostPrice": ".000",
"Date": "12228000000000",
"Image": ""
},
{
"ID": "12238000006703",
"Category": "LEAF TEA_GOU",
"Name": "TINCADDY 125g EA",
"Code": "81032-006",
"Description": "TIN CADDY 125g\/06 ENGLISH AFTERNOON",
"Price": "450.000",
"isservicecharge": 0,
"isaddonapplicable": 0,
"CostPrice": ".000",
"Date": "12228000000001",
"Image": ""
},
{
"ID": "12238000003727",
"Category": "TEA BAGS_GOU",
"Name": "FOIL ENV TBAG 025 ENG BFST",
"Code": "80086-012",
"Description": "FOIL ENV TBAG 025\/2.0g\/12 ENGLISH BREAKFAST",
"Price": "160.000",
"isservicecharge": 0,
"isaddonapplicable": 0,
"CostPrice": ".000",
"Date": "12228000000001",
"Image": ""
}
]
}