如果您希望在整个应用程序生命周期中使用一个，这是非常好的，但是您可能希望为每个API端点配置不同的配置。

builder.Register(ctx => new HttpClient() {BaseAddress = new Uri("https://api.ipify.org")})
    .Named<HttpClient>("ipify")
    .SingleInstance();

builder.Register(ctx => new HttpClient() { BaseAddress = new Uri("https://api.postcodes.io") })
    .Named<HttpClient>("postcodes.io")
    .SingleInstance();

假设我们有一个PostcodeQueryHandler

public class PostcodeQueryHandler
{
    public PostcodeQueryHandler(HttpClient httpClient) { }
}

我们会设置这样的绑定

builder.Register(ctx => new PostcodeQueryHandler(ctx.ResolveNamed<HttpClient>("postcodes.io")))
        .InstancePerDependency();