我的代码有错误 System.Net.WebException：'An exception occurred during a WebClient request.'

Question

我的 xamarin 代码有 System.Net.WebException: 'An exception occurred during a WebClient request.' 错误

NameValueCollection postCollection = new NameValueCollection();
postCollection.Add("q", city);
postCollection.Add("appid", ApiKey);

WebClient postClient = new WebClient();

var postResult = postClient.UploadValues(
       "https://samples.openweathermap.org/data/2.5/weather", 
       "GET", 
       postCollection); //this line has error

Answer 1

您几乎肯定会遇到以下错误：

Cannot send a content-body with this verb-type.

这是因为 UploadValues 旨在表示 POST 或 PUT 样式请求，因此 postCollection 被序列化为请求正文，这对于 GET 请求是不允许的。

解决此问题的最佳方法是使用 Download* 系列方法之一，例如DownloadString，旨在用于 GET 请求：

var url = $"https://samples.openweathermap.org/data/2.5/weather?q={city}&appid={ApiKey}"
var response = postClient.DownloadString(url);

我的代码有错误 System.Net.WebException：'An exception occurred during a WebClient request.'

my code has error System.Net.WebException: 'An exception occurred during a WebClient request.'

c#

api

system.net.webexception

xamarin