c# - 未找到 .net 核心中的 Web 请求处理程序？

Question

基本上我从 .framework 迁移至 .core然后我遇到了一个错误，找不到 Web 请求处理程序。我搜索了 .netcore 的替代方法here .

是否有其他注册 Web 请求处理程序的方法？

error

Severity    Code    Description Project File    Line    Suppression State
Error   CS0246  The type or namespace name 'WebRequestHandler' could not be found 
(are you missing a using directive or an assembly reference?)

public HttpClient ConfigureHttpClient(Configuration.Configuration config)
{
    WebRequestHandler mtlsHandler = new WebRequestHandler
    {
        UseProxy = true,
        UseCookies = false,
        CachePolicy = new HttpRequestCachePolicy(HttpRequestCacheLevel.NoCacheNoStore),
        AuthenticationLevel = AuthenticationLevel.MutualAuthRequired,
        AllowAutoRedirect = false
    };
}

Answer 1

在 .netcore 中，等效项是 HttpClientHandler , 描述 here .出于 post 中提到的一些原因您已经引用了，HttpClientHandler公开的选项少于 WebRequestHandler .

下面是配置 HttpClient 的代码以类似于您的示例的方式，使用 HttpClientHandler :

var mtlsHandler = new HttpClientHandler {
   UseProxy = true,
   UseCookies = false,
   AllowAutoRedirect = false
   // CachePolicy = ... not supported and set to HttpRequestLevel.BypassCache equivalent, see https://github.com/dotnet/runtime/issues/21799
   // AuthenticationLevel = ... need to implement it yourself by deriving from HttpClientHandler, see https://stackoverflow.com/questions/43272530/whats-the-alternative-to-webrequesthandler-in-net-core
};

var httpClient = new HttpClient(mtlsHandler);

不幸的是，还有 2 个 Unresolved 方面，都需要在 HttpClientHandler 之上进行您自己的自定义实现:

不支持 CachePolicy除了 BypassCache 等效项，讨论了 here .

不支持 AuthenticationLevel , 讨论 here .