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方法内执行Configure扩展方法时，会引发错误：

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

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

Answer 1

您必须通过AddHealthChecks()扩展方法配置运行状况检查基础结构服务。例如：

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

另请参阅np.arange。

Answer 2

就我而言，运行状况检查UI本身不会启动并导致.net core 3.1 Web API应用程序崩溃。

错误消息： 无法构造某些服务（验证服务描述符'ServiceType：HealthChecks.UI.Core.Notifications.IHealthCheckFailureNotifier寿命：范围内的实现类型：HealthChecks.UI.Core.Notifications.WebHookFailureNotifier'时出错：无法解析服务尝试激活“ HealthChecks.UI.Core.Notifications.WebHookFailureNotifier”时输入类型“ HealthChecks.UI.Core.Data.HealthChecksDb”。）

修复：添加任何UI storage provider。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
    }

ASP.NET Core-尝试使用HealthChecks时出错

2 个答案: