C#中HttpClient问题"Properties can only be modified before sending the first request"

Question

使用HttpClient的C#代码如下：

public class TestClass
{
   private static readonly HttpClient _httpClient = new HttpClient();
   public async Task TestMethod ()
   { 
       //...
       _httpClient.BaseAddress = new Uri("http://xxx");
       //...
    }
}

运行时报错

System.InvalidOperationException: This instance has already started one or more requests. Properties can only be modified before sending the first request.
   at System.Net.Http.HttpClient.CheckDisposedOrStarted()
   at System.Net.Http.HttpClient.set_BaseAddress(Uri value)

Answer 1

在初始化的时候就定义BaseAddress呗

Answer 2

我还以为java类库~ 不清楚你上下文，但堆栈貌似很明白。 不过还是推荐这种低级类库别用了，直接用RestSharp，我写外挂有时都用这玩意儿，认证、序列化等等封装都比较可以。

Answer 3

HttpClient - This instance has already started