.net-core - azure webjob : Read appSettings. json 并将配置注入(inject) TimerTrigger

Question

我无法从 webjob 中的 appSettings.json 文件读取配置值。 webjob 使用以下 nuget 包:



我的控制台应用程序(webjob)中有两个设置文件:
appsettings.development.json
appsettings.production.json

在Main方法中，webjob的配置如下:

 static void Main(string[] args)
    {
        var builder = new HostBuilder()
                .ConfigureWebJobs(webJobConfiguration =>
                {
                    webJobConfiguration.AddTimers();
                    webJobConfiguration.AddAzureStorageCoreServices();  
                })
                .ConfigureAppConfiguration((hostingContext, config) =>
                 {
                     var env = hostingContext.HostingEnvironment;
                     Console.WriteLine("hostingContext.HostingEnvironment: " + env.EnvironmentName);
                     config.SetBasePath(Directory.GetCurrentDirectory())
                     .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: false, reloadOnChange: true)
                     .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: false, reloadOnChange: true)
                     .AddEnvironmentVariables().Build();
                 })
                .ConfigureServices((context, serviceCollection) =>
                {
                    serviceCollection.AddSingleton<IConfiguration>(context.Configuration);
                    serviceCollection.AddTransient<SayHelloWebJob>(job => new SayHelloWebJob(context.Configuration));
                })
                .Build();

        builder.Run();
    }

SayHelloWebJob 的代码如下:

public class SayHelloWebJob
{
     static IConfiguration _configuration;
    public SayHelloWebJob(IConfiguration config)
    {
        _configuration = config;
        Console.WriteLine("Initialized SayHelloWebJob");
    }

    [Singleton]
    public static void TimerTick([TimerTrigger("0 */1 * * * *")]TimerInfo myTimer)
    {
        Console.WriteLine($"From SayHelloWebJob: Hello at {DateTime.UtcNow.ToString()}");
        var test = _configuration.GetSection("WebJobConfiguration:message").Value;
        Console.WriteLine("Configuration access: message: " + test);
        Console.WriteLine("Configuration access: " + _configuration.GetSection("WebJobConfiguration:api").Value);
        Console.WriteLine("configuration object: "+ _configuration.GetConnectionString("AzureWebJobsStorage"));

    }
}

当我运行我的 webjob 时，我看到 console.writeline 日志从不输出我试图在 TimerTick 方法中读取的配置。

问题:

如何在 TimerTick 方法中注入(inject) appSettings 配置？

我有两个 appSettings 文件 - 用于开发和生产。如何确保在生产过程中加载了正确的文件？

下面的示例 appSettings.development.json 文件:

{
"connectionStrings": {
    "AzureWebJobsStorage": stringhere",
    "AzureWebJobsDashboard": "stringhere"
},
"WebJobConfiguration": {
    "message": "I'm running locally!",
    "pfuWebApiUrl": "API link here",
    "api": "api here",
    "ApplicationInsights": {
        "InstrumentationKey": "key here"
    }
}

}

Answer 1

我的偏好是像您一样检查所有环境配置，并且绝对可以在运行时根据环境加载正确的文件。

首先在 Visual Studio 的“属性” Pane 中将您的配置文件设置为“复制到较新的输出目录”，或将其添加到您的 csproj:

    <None Update="base.settings.json">
      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
    </None>
    <None Update="prod.settings.json">
      <CopyToPublishDirectory>PreserveNewest</CopyToPublishDirectory>
    </None>

现在您只需要在运行时加载正确的配置。

        private static IConfigurationRoot GetConfiguration(string basePath)
        {
            string filename = Constants.IsAzureEnvironment ? "prod.settings.json" : "dev.settings.json";

            IConfigurationBuilder configBuilder = new ConfigurationBuilder()
                .SetBasePath(basePath)
                .AddJsonFile("base.settings.json")
                .AddJsonFile(filename);

            return configBuilder.Build();
        }

我从 azure 函数的 executionContext 参数中获取 basePath

        [FunctionName("Function1")]
        public static async Task<IActionResult> RunAsync([HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req, ILogger log, Microsoft.Azure.WebJobs.ExecutionContext context)
        {
            // context.FunctionAppDirectory
            return new OkResult();
        }