我正在使用Xamarin进行跨平台项目。现在，我陷入了API JSON数据，数据类和ListView的问题。

这是我的TideInfo类中的代码：

public class TideRoot {
    [JsonProperty("EventType")]
    public string EventType { get; set; } = string.Empty;

    [JsonProperty("DateTime")]
    public DateTime DateTime { get; set; }

    [JsonProperty("IsApproximateTime")]
    public bool IsApproximateTime { get; set; }

    [JsonProperty("Height")]
    public double Height { get; set; }

    [JsonProperty("IsApproximateHeight")]
    public bool IsApproximateHeight { get; set; }

    [JsonProperty("Filtered")]
    public bool Filtered { get; set; }

    [JsonIgnore]
    public string DisplayTide => $"Height: {EventType ?? string.Empty},{Height}";


}

public class TideRootList {
    public List<TideRoot> ListItem { get; set; } }

我使用json2csharp来获取TideRoot列表，并添加了DisplayTide，因此我可以在列表中同时显示EventType和Height。最近，我添加了TideRootList以获取有关潮汐7天信息的列表。

这是JSON文件：

[{
  "EventType": "LowWater","DateTime": "2019-11-08T01:32:00","IsApproximateTime": false,"Height": 1.8388111705145762,"IsApproximateHeight": false,"Filtered": false
},{
  "EventType": "HighWater","DateTime": "2019-11-08T08:56:00","Height": 4.2101062451792144,{
  "EventType": "LowWater","DateTime": "2019-11-08T14:03:00","Height": 1.7989273407141986,"DateTime": "2019-11-08T21:04:00","Height": 4.070738079705702,"DateTime": "2019-11-09T02:16:00","Height": 1.6184884034712226,"DateTime": "2019-11-09T09:34:00","Height": 4.4085443850273309,"DateTime": "2019-11-09T14:44:00","Height": 1.5501832117158008,"DateTime": "2019-11-09T21:44:00","Height": 4.2701942634884968,"DateTime": "2019-11-10T02:56:00","Height": 1.4077035385806112,"DateTime": "2019-11-10T10:09:00","Height": 4.5597566246677248,"DateTime": "2019-11-10T15:20:00","Height": 1.33459759647378,"DateTime": "2019-11-10T22:21:00","Height": 4.4226776330873276,"DateTime": "2019-11-11T03:32:00","Height": 1.2396397924330329,"DateTime": "2019-11-11T10:44:00","Height": 4.6557658698506978,"DateTime": "2019-11-11T15:55:00","Height": 1.1711223007079854,"DateTime": "2019-11-11T22:57:00","Height": 4.5263662430387752,"DateTime": "2019-11-12T04:08:00","Height": 1.1263357912996472,"DateTime": "2019-11-12T11:17:00","Height": 4.7038380223666625,"DateTime": "2019-11-12T16:29:00","Height": 1.0599435514996523,"DateTime": "2019-11-12T23:29:00","Height": 4.5937485679887731,"DateTime": "2019-11-13T04:42:00","Height": 1.0650050994934075,"DateTime": "2019-11-13T11:48:00","Height": 4.7189203663268842,"DateTime": "2019-11-13T17:02:00","Height": 0.99227216956188025,"DateTime": "2019-11-14T00:00:00","Height": 4.6379169444371362,"DateTime": "2019-11-14T05:17:00","Height": 1.0460921771289937,"DateTime": "2019-11-14T12:17:00","Height": 4.7116384452230751,"DateTime": "2019-11-14T17:36:00","Height": 0.9624477944154356,"Filtered": false
}]

这就是我处理API的方式：

public async Task<TideRootList> GetTideInfo(string id,string duration)
        {
            using (var client = new HttpClient())
            {
                // Request headers
                client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key","223604c97163487bb857cfb554c96c90");

                var url = string.Format(TideInfo,id,duration);
                var json = await client.GetStringAsync(url);

                if (string.IsnullOrWhiteSpace(json))
                    return null;

                json.Replace("[","").Replace("]","");

                //deserialize the array into a list of Result objects,and take the object at index zero.
                var result = JsonConvert.DeserializeObject<List<TideRootList>>(json);
                return result[0];
            }

        }

最后一部分是执行API方法并将信息提供给XAML的viewModel。两者都在这里：

TideRootList tidelist;
        public TideRootList TideList
        {
            get { return tidelist; }
            set { tidelist = value; OnPropertyChanged(); }
        }


 TideList = await WeatherService.GetTideInfo("0065","7");

还有XAML：

<StackLayout Padding="10" Spacing="10">
            <ListView ItemsSource="{Binding TideRootList.ListItem}"
              HasUnevenRows="True"
              CachingStrategy="RecycleElement"
              IsPullToRefreshEnabled="True"
              RefreshCommand="{Binding GetWeatherCommand}"
              IsRefreshing="{Binding IsBusy,Mode=OneWay}"
              RowHeight="66"
              x:Name="ListViewTide">
                <ListView.SeparatorColor>
                    <OnPlatform x:TypeArguments="Color" iOS="Transparent"/>
                </ListView.SeparatorColor>
                <ListView.ItemTemplate>
                    <DataTemplate>
                        <ViewCell>
                            <StackLayout Orientation="Horizontal" Padding="10,0">
                                <StackLayout Padding="10" Spacing="5">
                                    <Label Text="{Binding DisplayTide}"
                                   TextColor="#3498db"
                                           FontAttributes="Bold"
                                   Style="{Dynamicresource ListItemTextStyle}"/>
                                    <Label Text="{Binding DisplayTide}" 
                                   Style="{Dynamicresource ListItemDetailTextStyle}"/>
                                </StackLayout>
                            </StackLayout>
                        </ViewCell>
                    </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </StackLayout>

经过许多不同的测试后，我无法在应用程序上显示DisplayTide，它只是一个空白。请告诉我我所缺少的。谢谢。