我有一个问题，我似乎无法绕过头脑。我是Xamarin.Forms（和C＃）的新手，我正在尝试反馈我从Giphy.com请求的Json数据。这是我的代码：
var uri = new Uri(string.Format ("http://api.giphy.com/v1/gifs/search?q=" + SearchText + "&api_key=1234&limit=5", string.Empty));
HttpResponseMessage response = await client.GetAsync(uri);
if (response.IsSuccessStatusCode)
{
try
{
string json = await response.Content.ReadAsStringAsync();
var data = (JObject)JsonConvert.DeserializeObject(json);
string ImageUrl = data["url"].Value<string>();
Giphy = _giphyService.GetGiphyImageUrl(ImageUrl);
}
catch(Exception e)
{
Debug.WriteLine("Message: " + e);
}
}
在我尝试使用ImageUrl字符串之前，我的应用程序没有出错。该错误告诉我ImageUrl为空，而“url”键确实存在于我的Json数据中。我使用不同的Json字符串测试了相同的代码，这很好。
这是可行的示例Json数据：
string json = "{ \"Atlantic/Canary\": \"GMT Standard Time\", \"Europe/Lisbon\": \"GMT Standard Time\", \"Antarctica/Mawson\": \"West Asia Standard Time\", \"Etc/GMT+3\": \"SA Eastern Standard Time\", \"Etc/GMT+2\": \"UTC-02\", \"Etc/GMT+1\": \"Cape Verde Standard Time\", \"Etc/GMT+7\": \"US Mountain Standard Time\", \"Etc/GMT+6\": \"Central America Standard Time\", \"Etc/GMT+5\": \"SA Pacific Standard Time\", \"Etc/GMT+4\": \"SA Western Standard Time\", \"Pacific/Wallis\": \"UTC+12\", \"Europe/Skopje\": \"Central European Standard Time\", \"America/Coral_Harbour\": \"SA Pacific Standard Time\", \"Asia/Dhaka\": \"Bangladesh Standard Time\", \"America/St_Lucia\": \"SA Western Standard Time\", \"Asia/Kashgar\": \"China Standard Time\", \"America/Phoenix\": \"US Mountain Standard Time\", \"Asia/Kuwait\": \"Arab Standard Time\" }";
这是我正在尝试使用的Json数据：
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151.101.38.2
我无法更改Json数据，因为我从URL获取它，但我认为它出错了，因为Json数据看起来与示例Json数据不同。如何从此Json数据中获取URL？
答案 0 :(得分：0)
我要做的第一件事是使用此工具将您的json转换为类： http://json2csharp.com/
完成此操作后，您可以使用已经使用的Newtonsoft库将json转换为类中的类型对象，如下所示：
var object = JsonConvert.DeserializeObject<ClassName>(json);
完成此操作后，您可以使用对象中的ImageUrl下载图像。您现在可以在Xamarin中使用WebClient，这可能是下载图像的最佳方式。你可以在这里看到一篇关于它的帖子：
How to download image from url
我不确定你的GetGiphyImageUrl方法是做什么的，但是你可以将数据加载到Image控件中：
using (var client = new WebClient())
{
bytes = await client.DownloadDataTaskAsync(Url);
Source = ImageSource.FromStream(() => new MemoryStream(bytes));
}