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c# - ASP.NET Core - 尝试使用 HealthChecks 时出错

问题描述

我正在尝试使用 .NET Core 2.2 健康检查。

在ConfigureServices我注册了实现Microsoft.Extensions.Diagnostics.HealthChecks.IHealthCheck接口的类。

但是当我在UseHealthChecks方法内部执行扩展方法时Configure，它会抛出一个错误：

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“Microsoft.Extensions.Diagnostics.HealthChecks.HealthCheckService”类型的服务

标签： c#asp.net-core

解决方案

在我的情况下，运行状况检查 UI 本身不会启动和崩溃 .net core 3.1 Web API 应用程序。

错误消息： 无法构造某些服务（验证服务描述符时出错'ServiceType：HealthChecks.UI.Core.Notifications.IHealthCheckFailureNotifier Lifetime：Scoped ImplementationType：HealthChecks.UI.Core.Notifications.WebHookFailureNotifier'：无法解析服务尝试激活“HealthChecks.UI.Core.Notifications.WebHookFailureNotifier”时输入“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()

启动.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";
        });
        ...
    }

应用设置.json

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

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