Question

我在appsettings.json文件中有这个

{
  "api": {
      "users": "/api/users",
      "Default": "/api"
   }
}

我想将“appsettings.json”反序列化到启动类中以获取value1 =“/ api / users”

结果，sectionData＆amp; value1为null，我不知道为什么..

public class Startup
    {
        public string value1, value2;
        public Startup(IHostingEnvironment env)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
                .AddEnvironmentVariables();

            if (env.IsDevelopment())
            {
                // This will push telemetry data through Application Insights pipeline faster, allowing you to view results immediately.
                builder.AddApplicationInsightsSettings(developerMode: true);
            }

            Configuration = builder.Build();
        }

        public IConfiguration Configuration { get; }
        public void ConfigureServices(IServiceCollection services)
        {
            // setup DI in service container
            services.AddOptions();
            services.AddSingleton<IConfiguration>(Configuration);
            IConfigurationSection sectionData = Configuration.GetSection("Api").GetSection("Users");
            Debug.WriteLine("section Data="+sectionData);
            value1 = Configuration.GetSection("api")["users"];
            Debug.WriteLine("testvvalue1=" + value1);
        }
    }

提前感谢您的帮助！

Answer 1

我猜你的文件没有被阅读。路径有问题检查你可以放 .AddJsonFile（＆＃34; appsettings.json＆＃34;，optional：false，reloadOnChange：true）

并检查它是否会抛出。

其他问题可能是＆＃34;用户＆＃34;不是部分而是价值。我不知道它是如何在内部管理的。你能检查一下吗？ Configuration.GetSection（＆＃34; api＆＃34;）也为空？

ASP.NET核心配置 - appsettings.json：值为空

1 个答案: