将处理程序添加到 httpclient 后无法添加构造函数

Question

为什么添加DelegatingHandler后无法添加身份验证详细信息？

在添加 DelegatingHandler 之前，我能够像这样实例化 HttpClient：

var client = new HttpClient{Credentials = ..., BaseAddress = ...};

添加DelegatingHandler 后，我无法添加Credentials 和BaseAddress：

var client = new HttpClient(new RetryHandler(new HttpClientHandler()));
client.BaseAddress = // does not exist!
client.Credentials = // does not exist!

我们如何向该客户端添加凭据和基地址？

Answer 1

这是您可以将凭据传递到处理程序的方式：

var clientHandler = new HttpClientHandler()
{
    Credentials = ...
};

var retryHandler = new RetryHandler(clientHandler);

var client = new HttpClient(retryHandler )
{
    BaseAddress = ...
};