我一直试图找出为什么我的控制台应用程序在引入新包后立即失败。使用IdentityModel.OidcClient and Microsoft.AspNetCore.Server.Kestrel only有效，但是添加时Microsoft.Extensions.Configuration.Json它抛出异常。我也不在代码中引用新包，我只是将其添加到项目中。

重现步骤：

1. Clone https://github.com/IdentityModel/IdentityModel.OidcClient.Samples.git https://github.com/IdentityModel/IdentityModel.OidcClient.Samples.git

2. Upgrade NetCore控制台客户端到 .NET 5（更新包）。

3. Remove Serilog.Sinks.Literate过时的包。

4. 删除呼叫.WriteTo.LiterateConsole对于 Program.cs 中的 SeriLog 并添加using IdentityModel.Client.

5. Add CancellationToken cancellationToken = new CancellationToken()参数为InvokeAsync中的方法SystemBrowser班级。签名为IBrowser接口已更改，新方法应如下所示：public async Task<BrowserResult> InvokeAsync(BrowserOptions options, CancellationToken cancellationToken = new CancellationToken())

6. 运行应用程序并使用 alice/alice 登录。获取token成功。

7. 添加包Microsoft.Extensions.Configuration.Json.

8. 运行应用程序。它现在抛出异常Object reference not set to an instance of an object当写入http响应时。

异常发生在LoopbackHttpListener.SetResult写回复时：ctx.Response.WriteAsync("<h1>You can now return to the application.</h1>");

为什么添加包only，对运行时间有这么大的影响吗？

项目文件：

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <TargetFramework>net5.0</TargetFramework>
    <AssemblyName>NetCoreConsoleClient</AssemblyName>
    <OutputType>Exe</OutputType>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="5.0.0" />
    <PackageReference Include="Serilog.Extensions.Logging" Version="3.0.1" />
    <PackageReference Include="Microsoft.AspNetCore.Server.Kestrel" Version="2.2.0" />
    <PackageReference Include="IdentityModel.OidcClient" Version="3.1.2" />
  </ItemGroup>

</Project>

完整异常：

System.NullReferenceException
  HResult=0x80004003
  Message=Object reference not set to an instance of an object.
  Source=Microsoft.AspNetCore.Server.Kestrel.Core
  StackTrace:
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.CreateResponseHeader(Boolean appCompleted)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.ProduceStart(Boolean appCompleted)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.InitializeResponseAsync(Int32 firstWriteByteCount)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpProtocol.WriteAsync(ReadOnlyMemory`1 data, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Server.Kestrel.Core.Internal.Http.HttpResponseStream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Http.HttpResponseWritingExtensions.WriteAsync(HttpResponse response, String text, Encoding encoding, CancellationToken cancellationToken)
   at Microsoft.AspNetCore.Http.HttpResponseWritingExtensions.WriteAsync(HttpResponse response, String text, CancellationToken cancellationToken)
   at ConsoleClientWithBrowser.LoopbackHttpListener.SetResult(String value, HttpContext ctx) in C:\Users\stefa\Source\Repos\IdentityModel.OidcClient.Samples\NetCoreConsoleClient\src\NetCoreConsoleClient\SystemBrowser.cs:line 172

Solution

摆脱Microsoft.AspNetCore.Server.Kestrel and Microsoft.Extensions.Configuration.Json，将SDK更改为Microsoft.NET.Sdk.Web一切正常。感谢@JHBonarius 为我指明了正确的方向。

我有完全相同的问题。

 ctx.Response.StatusCode = 200;
 ctx.Response.ContentType = "text/html";
 ctx.Response.Headers.Add("Date", DateTimeOffset.UtcNow.ToString());
 await ctx.Response.WriteAsync(content);
 await ctx.Response.Body.FlushAsync();

设置日期标头解决了这个问题 4 我，因为这就是 Kestrel.Core 中失败的地方