c# - 使用 Xamarin.Forms C# 反序列化 Json 数据

Question

我有一个问题，我似乎无法解决问题。我是 Xamarin.Forms(和 C#)的新手，我正在尝试反序列化从 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);
                }

            }

在尝试使用 ImageUrl 字符串之前，我的应用程序不会给出错误。该错误告诉我 ImageUrl 为空，而“url”键确实存在于我的 Json 数据中。我用不同的 Json 字符串测试了相同的代码，效果很好。

这是有效的示例 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\" }";

这是我尝试使用的 Json 数据:

{"data":[{"type":"gif","id":"26gscSULUcfKU7dHq","slug":"studiosoriginals-alphabet-gilphabet-26gscSULUcfKU7dHq","url":"https:\/\/giphy.com\/gifs\/studiosoriginals-alphabet-gilphabet-26gscSULUcfKU7dHq","bitly_gif_url":"http:\/\/gph.is\/2ktry2w","bitly_url":"http:\/\/gph.is\/2ktry2w","embed_url":"https:\/\/giphy.com\/embed\/26gscSULUcfKU7dHq","username":"studiosoriginals","source":"","rating":"g","content_url":"","source_tld":"","source_post_url":"","is_indexable":0,"import_datetime":"2017-02-01 22:22:47","trending_datetime":"2017-02-08 18:52:29","user":{"avatar_url":"https:\/\/media.giphy.com\/avatars\/studiosoriginals\/j3JBzK5twdv8.jpg","banner_url":"https:\/\/media.giphy.com\/headers\/studiosoriginals\/fHmcHCHkISg3.gif","profile_url":"https:\/\/giphy.com\/studiosoriginals\/","username":"studiosoriginals","display_name":"GIPHY Studios Originals","twitter":""},"images":{"fixed_height_still":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200_s.gif","width":"300","height":"200","size":"6048"},"original_still":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy_s.gif","width":"480","height":"320","size":"9780"},"fixed_width":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200w.gif","width":"200","height":"133","size":"13081","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200w.mp4","mp4_size":"4579","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200w.webp","webp_size":"11096"},"fixed_height_small_still":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100_s.gif","width":"150","height":"100","size":"3375"},"fixed_height_downsampled":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200_d.gif","width":"300","height":"200","size":"23490","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200_d.webp","webp_size":"16284"},"preview":{"width":"480","height":"320","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-preview.mp4","mp4_size":"9295"},"fixed_height_small":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100.gif","width":"150","height":"100","size":"9207","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100.mp4","mp4_size":"3577","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100.webp","webp_size":"8370"},"downsized_still":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-downsized_s.gif","width":"480","height":"320","size":"9780"},"downsized":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-downsized.gif","width":"480","height":"320","size":"44098"},"downsized_large":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy.gif","width":"480","height":"320","size":"44098"},"fixed_width_small_still":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100w_s.gif","width":"100","height":"67","size":"2342"},"preview_webp":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-preview.webp","width":"480","height":"320","size":"27344"},"fixed_width_still":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200w_s.gif","width":"200","height":"133","size":"4082"},"fixed_width_small":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100w.gif","width":"100","height":"67","size":"5871","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100w.mp4","mp4_size":"2690","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/100w.webp","webp_size":"6206"},"downsized_small":{"width":"480","height":"320","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-downsized-small.mp4","mp4_size":"9295"},"fixed_width_downsampled":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200w_d.gif","width":"200","height":"133","size":"13081","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200w_d.webp","webp_size":"11096"},"downsized_medium":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy.gif","width":"480","height":"320","size":"44098"},"original":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy.gif","width":"480","height":"320","size":"44098","frames":"6","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy.mp4","mp4_size":"10969","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy.webp","webp_size":"28662","hash":"fe97ee89c8223e31ed7c1ac2080aaf32"},"fixed_height":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200.gif","width":"300","height":"200","size":"23490","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200.mp4","mp4_size":"6847","webp":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/200.webp","webp_size":"16284"},"looping":{"mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-loop.mp4","mp4_size":"269263"},"original_mp4":{"width":"480","height":"320","mp4":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy.mp4","mp4_size":"10969"},"preview_gif":{"url":"https:\/\/media2.giphy.com\/media\/26gscSULUcfKU7dHq\/giphy-preview.gif","width":"480","height":"320","size":"44098"},"480w_still":{"url":"https:\/\/media4.giphy.com\/media\/26gscSULUcfKU7dHq\/480w_s.jpg","width":"480","height":"320"}}},{"type":"gif","id":"3oKIPnvlVTnGnFunok","slug":"studiosoriginals-3oKIPnvlVTnGnFunok","url":"https:\/\/giphy.com\/gifs\/studiosoriginals-3oKIPnvlVTnGnFunok","bitly_gif_url":"http:\/\/gph.is\/2oUxRj8","bitly_url":"http:\/\/gph.is\/2oUxRj8","embed_url":"https:\/\/giphy.com\/embed\/3oKIPnvlVTnGnFunok","username":"studiosoriginals","source":"","rating":"g","content_url":"","source_tld":"","source_post_url":"","is_indexable":0,"import_datetime":"2017-05-02 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151.101.38.2

我无法更改 Json 数据，因为我是从 URL 获取它的，但我认为它出错了，因为 Json 数据看起来与示例 Json 数据不同。我如何从这个 Json 数据中获取 URL？

Answer 1

我要做的第一件事是使用此工具将您的 json 转换为一个类: http://json2csharp.com/

完成此操作后，您可以使用已经在使用的 Newtonsoft 库将 json 转换为类中的类型化对象，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

我不确定您的 GetGiphyImageUrl 方法的作用，但这是将数据加载到图像控件中的方法:

                using (var client = new WebClient())
                {
                    bytes = await client.DownloadDataTaskAsync(Url);

                    Source = ImageSource.FromStream(() => new MemoryStream(bytes));
                }