如何使用 HttpClient 读取 XML 响应？

Question

显然HttpClient 是发出 HTTP 请求的新推荐方式，因此我尝试使用它向 Delicious API 发出请求，该 API 返回一个 XML 响应。这是我得到的：

internal class Program
{
    private static void Main(string[] args)
    {
        var credentials = new NetworkCredential("username", "password");
        var handler = new HttpClientHandler { Credentials = credentials};
        var client = new HttpClient(handler);

        var suggest = new Uri("https://api.del.icio.us/v1/posts/suggest");

        var suggestions =
            client.GetAsync(suggest.AddQueryParams("url", "https://yahoo.com"))
                .ContinueWith(t => t.Result.Content.ReadAsAsync<DeliciousSuggest>())
                .Unwrap()
                .Result;



        Console.ReadLine();
    }
}

public class DeliciousSuggest
{
    public string[] Popular { get; set; }
    public string[] Recommended { get; set; }
    public string[] Network { get; set; }
}

但是，它会在 ReadAsAsync 位上引发异常，

附加信息：无法加载文件或程序集“Newtonsoft.Json, Version=4.5.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed”或其依赖项之一。系统找不到指定的文件。

也许我错过了一些程序集，但这让我很反感。返回类型是 XML，而不是 JSON，但我仍然不太确定这个 ReadAsAsync 方法是如何工作的，或者我什至会如何指定它。

示例响应如下所示：

<?xml version=\"1.0\" encoding=\"UTF-8\"?>
<suggest>
<popular>yahoo!</popular>
<popular>yahoo</popular>
<popular>web</popular>
<popular>tools</popular>
<popular>searchengines</popular>
<recommended>yahoo!</recommended>
<recommended>yahoo</recommended>
<recommended>web</recommended>
<network>for:Bernard</network>
<network>for:britta</network>
<network>for:deusx</network>
</suggest>

我怎样才能把它解析成一些可用的格式？

Answer 1

“我怎样才能把它解析成一些可用的格式？”

    [XmlRoot("suggest")]
public class DeliciousSuggest {
    [XmlElement("popular")]
    public string[] Popular { get; set; }

    [XmlElement("recommended")]
    public string[] Recommended { get; set; }

    [XmlElement("network")]
    public string[] Network { get; set; }
}

并使用 XmlSerializer 进行反序列化。

---

您应该将 del.icio.us 的响应作为字符串读回，然后您可以按如下方式对其进行反序列化：

var s = "this is the response from del"; 
var buffer = Encoding.UTF8.GetBytes(s); 
using (var stream = new MemoryStream(buffer)) { 
    var serializer = new XmlSerializer(typeof(DeliciousSuggest)); 
    var deliciousSuggest = (DeliciousSuggest)serializer.Deserialize(stream); 
    //then do whatever you want
}