An exception occurred: Cannot access a disposed object.

[zengqinglei]

Instructions When I use HttpClient and join HttpClientMessageHandler, an exception occurs:Cannot access a disposed object.

This exception occurs when I request more than twice

Run Environment .net core: 2.2 castle.windsor: 5.0.1

Minimal repro steps

1. Create asp.net core 2.2 api project

   
   <Project Sdk="Microsoft.NET.Sdk.Web">
   
   <PropertyGroup>
   <TargetFramework>netcoreapp2.2</TargetFramework>
   <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
   </PropertyGroup>
   
   <ItemGroup>
   <PackageReference Include="Autofac.Extensions.DependencyInjection" Version="5.0.1" />
   <PackageReference Include="Castle.Windsor" Version="5.0.1" />
   <PackageReference Include="Castle.Windsor.MsDependencyInjection" Version="3.3.1" />
   <PackageReference Include="Microsoft.AspNetCore.App" />
   <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.2.0" PrivateAssets="All" />
   </ItemGroup>

2. Add service interface
```csharp
/// <inheritdoc />
public class RepoService : IRepoService
{
    private readonly HttpClient _httpClient;

    /// <inheritdoc />
    public RepoService(HttpClient client)
    {
        _httpClient = client;
    }

    /// <inheritdoc />
    public async Task<IEnumerable<GitHubIssue>> GetRepos()
    {
        var response = await _httpClient.GetAsync("repos/aspnet/AspNetCore.Docs/issues?state=open&sort=created&direction=desc");

        response.EnsureSuccessStatusCode();

        var result = await response.Content.ReadAsAsync<IEnumerable<GitHubIssue>>();

        return result;
    }
}

3. Inject HttpClient in Startup

   // This method gets called by the runtime. Use this method to add services to the container.
   public IServiceProvider ConfigureServices(IServiceCollection services)
   {
   services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
   
   services.AddTransient<ValidateHeaderHandler>();
   services.AddHttpClient<IRepoService, RepoService>(
       c =>
       {
           c.BaseAddress = new Uri("https://api.github.com/");
           c.DefaultRequestHeaders.Add("Accept", "application/vnd.github.v3+json");
           c.DefaultRequestHeaders.Add("User-Agent", "HttpClientFactory-Sample");
       })
       .AddHttpMessageHandler<ValidateHeaderHandler>();
   
   if (false)
   {
       return services.UseAutofac();
   }
   else
   {
       return services.UseWindsor();
   }
   }

4. Use the Castle.Windsor container

   public static class ServiceCollectionExtension
   {
   public static IServiceProvider UseAutofac(this IServiceCollection services)
   {
       // create a container-builder and register dependencies
       var builder = new ContainerBuilder();
   
       // populate the service-descriptors added to `IServiceCollection`
       // BEFORE you add things to Autofac so that the Autofac
       // registrations can override stuff in the `IServiceCollection`
       // as needed
       builder.Populate(services);
   
       // this will be used as the service-provider for the application!
       return new AutofacServiceProvider(builder.Build());
   }
   
   public static IServiceProvider UseWindsor(this IServiceCollection services)
   {
       var windsorContainer = new WindsorContainer();
   
       return WindsorRegistrationHelper.CreateServiceProvider(windsorContainer, services);
   }
   }

5. The code in ApiController is as follows:

   [Route("api/[controller]")]
   [ApiController]
   public class ValuesController : ControllerBase
   {
   private readonly IRepoService _repoService;
   
   /// <inheritdoc />
   public ValuesController(IRepoService repoService)
   {
       _repoService = repoService;
   }
   
   // GET api/values
   [HttpGet]
   public async Task<IEnumerable<GitHubIssue>> Get()
   {
       return await _repoService.GetRepos();
   }
   }

   Demo code: https://github.com/zengqinglei/TestHttpClientHandlerDispose.git

Then after starting the project, the second time the page is refreshed, the following exception occurs:

I use the Autofac container and it works fine! I hope to get your reply as soon as possible, thank you!

[zengqinglei]

@maliming Hi: Is there a repair plan for this problem? Thank you!

[maliming]

I have tried, there is indeed a problem as you said. Castle-windsor-ms-adapter will support net core 3.0. We need to wait for hikalkan to handle this problem, the problem is beyond my ability. :)

[zengqinglei]

@maliming ok!

[maliming]

Fixed by volosoft/castle-windsor-ms-adapter#38