Microsoft.AspNetCore.Mvc.ControllerBase.Request.**get**返回null

public async Task<IActionResult> MyAction()
{
    await Task.Delay(1000); // 模拟异步操作
    var request = Request; // 此时应该不会为 null
    // ...
}

public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    // 确保 UseRouting 在自定义中间件之前调用
    app.UseRouting();
    
    app.UseMiddleware<MyCustomMiddleware>();
    
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapControllers();
    });
}

[Test]
public async Task TestMyAction()
{
    var mockHttpContext = new Mock<HttpContext>();
    mockHttpContext.SetupGet(x => x.Request).Returns(new DefaultHttpRequest(new DefaultHttpContext()));
    
    var controller = new MyController();
    controller.ControllerContext = new ControllerContext(new ActionContext(mockHttpContext.Object, new RouteData(), controller));
    
    var result = await controller.MyAction();
    // 断言和验证结果
}

public class MyController : ControllerBase
{
    private readonly HttpRequest _request;

    public MyController(HttpRequest request)
    {
        _request = request;
    }

    public IActionResult MyAction()
    {
        // 使用 _request 而不是 ControllerBase.Request
        return Ok();
    }
}