ASP.NET Core - 尝试使用 HealthChecks 时出错

Question

我正在尝试使用 .NET Core 2.2 运行状况检查。

在

ConfigureServices

中，我注册了实现

Microsoft.Extensions.Diagnostics.HealthChecks.IHealthCheck

接口的类。

但是当我在

UseHealthChecks

方法中执行

Configure

扩展方法时，它会抛出错误：

public void Configure(IApplicationBuilder app)
{
    app.UseHealthChecks("/hc"); // <-- Error in this line
    // ...

System.InvalidOperationException：“尝试激活“Microsoft.AspNetCore.Diagnostics.HealthChecks.HealthCheckMiddleware”时无法解析类型“Microsoft.Extensions.Diagnostics.HealthChecks.HealthCheckService”的服务

Answer 1

在我的例子中，运行状况检查 UI 本身不会启动 .net core 3.1 Web API 应用程序并使其崩溃。

错误消息： 无法构建某些服务（验证服务描述符“ServiceType：HealthChecks.UI.Core.Notifications.IHealthCheckFailureNotifier Lifetime：Scoped ImplementType：HealthChecks.UI.Core.Notifications.WebHookFailureNotifier”时出错：无法解析类型的服务尝试激活“HealthChecks.UI.Core.Notifications.WebHookFailureNotifier”时出现“HealthChecks.UI.Core.Data.HealthChecksDb”。）

修复：添加任何UI存储提供程序。就我而言，我选择了 AddInMemoryStorage()

Startup.cs

    public void ConfigureServices(IServiceCollection services)
    {
        ...
        
        services.AddHealthChecks() 
            .AddDbContextCheck<PollDbContext>() //nuget: Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore
            .AddApplicationInsightsPublisher(); //nuget: AspNetCore.HealthChecks.Publisher.ApplicationInsights
    
        services.AddHealthChecksUI() //nuget: AspNetCore.HealthChecks.UI
            .AddInMemoryStorage(); //nuget: AspNetCore.HealthChecks.UI.InMemory.Storage
            
        ...
    }
    
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        ...
        
        app.UseHealthChecks("/healthcheck", new HealthCheckOptions
        {
            Predicate = _ => true,
            ResponseWriter = UIResponseWriter.WriteHealthCheckUIResponse //nuget: AspNetCore.HealthChecks.UI.Client
        });
        
        //nuget: AspNetCore.HealthChecks.UI
        app.UseHealthChecksUI(options =>
        {
            options.UIPath = "/healthchecks-ui";
            options.ApiPath = "/health-ui-api";
        });
        ...
    }

appsettings.json

    "HealthChecks-UI": {
        "DisableMigrations": true,
        "HealthChecks": [
            {
                "Name": "PollManager",
                "Uri": "/healthcheck"
            }
        ],
        "Webhooks": [
            {
                "Name": "",
                "Uri": "",
                "Payload": "",
                "RestoredPayload": ""
            }
        ],
        "EvaluationTimeOnSeconds": 10,
        "MinimumSecondsBetweenFailureNotifications": 60,
        "MaximumExecutionHistoriesPerEndpoint": 15
    }

Answer 2

您必须通过

AddHealthChecks()

扩展方法配置运行状况检查基础设施服务。例如：

public void ConfigureServices(IServiceCollection services)
{
    services.AddHealthChecks();
}

另请参阅文档。

Answer 3

我遇到了类似的错误：“尝试激活‘Microsoft.AspNetCore.HealthChecks.HealthCheckMiddleware’时无法解析类型‘Microsoft.Extensions.HealthChecks.IHealthCheckService’的服务”

奇怪的是，这个错误似乎只在我安装了一些不相关的 nuget 软件包后才出现。卸载这些软件包后，错误仍然存在！

在这个红鲱鱼上浪费了几个小时后，我意识到我在之前的提交中的 Program.cs 中有一个重复的 app.UseHealthChecks() 调用。此后我已将所有 HealthCheck 逻辑移至 Startup.cs 中...或者我是这么认为的。