Question

GetAirports让我填写_airports如果要取消索引，这意味着如果我使用_airport[0]

我也可以获得机场

但是，使用此公共API链接https://desktopapps.ryanair.com/en-gb/res/stations获取机场会使用分配了对象的索引数组。如何在不知道实际索引名称的情况下动态填充 _airports和解压缩？

public async Task<List<Airports>> GetAirports()
{
    string url = _BASEURL;
    if( _airports == null)
        _airports = await GetAsync<List<Airports>>(url);

    return _airports;
}

GetAsync功能：

protected async Task<T> GetAsync<T>(string url)
    {
        using (HttpClient client = CreateHttpClient())
        {
            try
            {
                var json = await client.GetStringAsync(url);
                return await Task.Run(() => JsonConvert.DeserializeObject<T>(json));
            }
            catch (Exception ex)
            {
                Debug.WriteLine(ex.Message);
                return default(T);
            }
        }
    }

机场型号：

public class Airports
{
    public string Name { get; set; }
    public string Country { get; set; }
    public string TimeZone { get; set; }
    public string Latitude { get; set; }
    public string Longitude { get; set; }
}

来自API

"AAL":{
    "name":"Aalborg Airport",
    "country":"DK",
    "timeZone":"DK",
    "latitude":"570535N",
    "longitude":"0095100E"
},
"AAR":{...}

Answer 1

以下是基于API返回的数据格式的解决方法。

向模型添加其他属性以保存密钥/代码，例如AAL

public class Airport { //<-- note the name change of the model
    public string Code { get; set; }
    public string Name { get; set; }
    public string Country { get; set; }
    public string TimeZone { get; set; }
    public string Latitude { get; set; }
    public string Longitude { get; set; }
}

接下来重构解析以使用Dictionary<string, Airport>，然后提取KeyValuePair以返回所需的类型

public async Task<List<Airport>> GetAirportsAsync() { //<-- note the name change
    string url = _BASEURL;
    if( _airports == null) {
        var data = await GetAsync<Dictionary<string, Airport>>(url);
        _airports = data.Select(_ => {
            var code = _.Key;
            var airport = _.Value;
            airport.Code = code;
            return airport;
        }).ToList();
    }

    return _airports;
}

从索引数组中动态填充mvvm模型

1 个答案: