Question

我正在为Windows Phone 8.1开发一个hub-pivot应用程序。我正在访问Datamodel文件夹中的sampledata.json。但是如何在线使用相同的sampledata.json文件。

可以使用

访问该文件

        Uri dataUri = new Uri("ms-appx:///DataModel/SampleData.json");

使用

解析数据

        StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(dataUri);
        string jsonText = await FileIO.ReadTextAsync(file);
        JsonObject jsonObject = JsonObject.Parse(jsonText);
        JsonArray jsonArray = jsonObject["Groups"].GetArray();

        foreach (JsonValue groupValue in jsonArray)
        {
            JsonObject groupObject = groupValue.GetObject();
            SampleDataGroup group = new SampleDataGroup(groupObject["UniqueId"].GetString(),
                                                        groupObject["Title"].GetString(),
                                                        groupObject["Subtitle"].GetString(),
                                                        groupObject["ImagePath"].GetString(),
                                                        groupObject["Description"].GetString());

            foreach (JsonValue itemValue in groupObject["Items"].GetArray())
            {
                JsonObject itemObject = itemValue.GetObject();
                group.Items.Add(new SampleDataItem(itemObject["UniqueId"].GetString(),
                                                   itemObject["Title"].GetString(),
                                                   itemObject["Subtitle"].GetString(),
                                                   itemObject["ImagePath"].GetString(),
                                                   itemObject["Description"].GetString(),
                                                   itemObject["Content"].GetString()));
            }
            this.Groups.Add(group);
        }

我想做httprequest，我也试过

        var client = new HttpClient();
        HttpResponseMessage response = await client.GetAsync(new Uri("http://url/sampledata.json"));
        string jsonString = await response.Content.ReadAsStringAsync();

在此之后，我很震惊。请帮忙

Answer 1

我有一些帮助方法可以将JSON自动转换为所需的类型。我的ASP.NET WebAPI服务返回JSON，我也以JSON格式发布数据。

public static async Task<TRes> Post<TReq, TRes>(string url, TReq data, HttpClient httpClient)
{
    HttpContent content = ToJsonHttpContent(data);
    HttpResponseMessage response = await httpClient.PostAsync(url, content);
    response.EnsureSuccessStatusCode();
    return await response.Content.Extract<TRes>();
}

public static async Task<T> Extract<T>(this HttpContent me)
{
    DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(T));
    using (Stream stream = await me.ReadAsStreamAsync())
    {
        return (T)serializer.ReadObject(stream);
    }
}

public static HttpContent ToJsonHttpContent(object data)
{
    string jsonData = JsonConvert.SerializeObject(data);
    return new StringContent(jsonData, Encoding.UTF8, "application/json");
}

在Windows Phone 8.1中阅读在线json数据

1 个答案: