无法从System.Int64强制转换或转换为System.Collections.Generic.List

Question

当我尝试从Twitter API反序列化JSON响应时，我收到以下异常。它有时会经历，但有时会有问题。

以下是课程：

public static List<Tweet> Newtwt = new List<Tweet>();

public class Url2
{
    public string url { get; set; }
    public string expanded_url { get; set; }
    public string display_url { get; set; }
    public List<int> indices { get; set; }
}

public class Url
{
    public List<Url2> urls { get; set; }
}

public class Description
{
    public List<object> urls { get; set; }
}

public class Entities
{
    public Url url { get; set; }
    public Description description { get; set; }
}

public class User
{
    public int id { get; set; }
    public string id_str { get; set; }
    public string name { get; set; }
    public string screen_name { get; set; }
    public string location { get; set; }
    public string description { get; set; }
    public string url { get; set; }
    public Entities entities { get; set; }
    public bool @protected { get; set; }
    public int followers_count { get; set; }
    public int friends_count { get; set; }
    public int listed_count { get; set; }
    public string created_at { get; set; }
    public int favourites_count { get; set; }
    public int utc_offset { get; set; }
    public string time_zone { get; set; }
    public bool geo_enabled { get; set; }
    public bool verified { get; set; }
    public int statuses_count { get; set; }
    public string lang { get; set; }
    public bool contributors_enabled { get; set; }
    public bool is_translator { get; set; }
    public string profile_background_color { get; set; }
    public string profile_background_image_url { get; set; }
    public string profile_background_image_url_https { get; set; }
    public bool profile_background_tile { get; set; }
    public string profile_image_url { get; set; }
    public string profile_image_url_https { get; set; }
    public string profile_link_color { get; set; }
    public string profile_sidebar_border_color { get; set; }
    public string profile_sidebar_fill_color { get; set; }
    public string profile_text_color { get; set; }
    public bool profile_use_background_image { get; set; }
    public bool default_profile { get; set; }
    public bool default_profile_image { get; set; }
    public object following { get; set; }
    public bool follow_request_sent { get; set; }
    public object notifications { get; set; }
}

public class Entities2
{
    public List<object> hashtags { get; set; }
    public List<object> symbols { get; set; }
    public List<object> urls { get; set; }
    public List<object> user_mentions { get; set; }
}

public class RootObject
{
    public string created_at { get; set; }
    public object id { get; set; }
    public string id_str { get; set; }
    public string text { get; set; }
    public string source { get; set; }
    public bool truncated { get; set; }
    public object in_reply_to_status_id { get; set; }
    public object in_reply_to_status_id_str { get; set; }
    public object in_reply_to_user_id { get; set; }
    public object in_reply_to_user_id_str { get; set; }
    public object in_reply_to_screen_name { get; set; }
    public User user { get; set; }
    public object geo { get; set; }
    public object coordinates { get; set; }
    public object place { get; set; }
    public object contributors { get; set; }
    public int retweet_count { get; set; }
    public int favorite_count { get; set; }
    public Entities2 entities { get; set; }
    public bool favorited { get; set; }
    public bool retweeted { get; set; }
    public string lang { get; set; }
    public bool? possibly_sensitive { get; set; }
}

public class Tweet
{
    public string UserName { get; set; }
    [JsonProperty(PropertyName = "text")]
    public string Message { get; set; }
    [JsonProperty(PropertyName = "id")]
    public object ID { get; set; }
    [JsonProperty(PropertyName = "created_at")]
    public DateTime TwitTime { get; set; }
}

我尝试以下列方式反序列化响应：

string str = TwitterAPI(Request.QueryString["screen_name"].ToString(), "10");
var root = JsonConvert.DeserializeObject<List<RootObject>>(str);

TwitterAPI()将从以下Twitter API返回响应：

https://api.twitter.com/1.1/statuses/user_timeline.json

以下是详细错误：

Answer 1

我刚刚找到答案。

问题在于Twitter API的局限性，因为文档说：

  

“当应用程序超过给定API端点的速率限制时，Twitter API现在将返回HTTP 429错误”

我超出限制因此它提供了例外 (429) Too Many Requests 。

如果您达到给定端点的速率限制，这将是您将看到的HTTP 429消息的正文：

{
  "errors": [
    {
      "code": 88,
      "message": "Rate limit exceeded"
    }
  ]
}

因此，它只返回JSON格式的错误消息，并将其传递给Deserialize函数，后者又发出错误。

感谢大家的建议。