ServiceCollection IOptions<>不能正确地绑定
ServiceCollection IOptions<>不能正确地绑定
提问于 2021-06-14 15:07:18
我试图绑定一些可配置的设置。这些值是通过app-setings.local.json提供的。要绑定到的模型称为“可配置设置”。我尝试学习一些教程并解决这个问题：
- https://andrewlock.net/how-to-use-the-ioptions-pattern-for-configuration-in-asp-net-core-rc2/
- https://github.com/aspnet/Configuration/issues/411
- Cannot set Configuration from JSON appsettings file in .NET Core project
- ServiceCollection returns null for IOptions even though GetSection is working
我试图遵循这里给出的建议，并在我自己的应用程序中应用它。经过4个小时的尝试，我没能让它开始工作。要么我缺乏实现这一目标所需的基本知识，要么我忽略了一些东西。
我的ConfigurableSettings类的结构如下：
public class ConfigurableSettings
{
public AppSettings _AppSettings;
public DgeSettings _DgeSettings;
public class AppSettings
{
[JsonProperty("SoftDelete")]
public bool SoftDelete { get; set; }
}
public class DgeSettings
{
[JsonProperty("zipFileUrl")]
public string zipFileUrl { get; set; }
[JsonProperty("sourceFileUrl")]
public string sourceFileUrl { get; set; }
}
}我的ConfigureServices的结构如下：
public static void ConfigureServices(IServiceCollection serviceCollection, string[] args)
{
var serviceCollection = new ServiceCollection();
serviceCollection.AddOptions();
var configuration = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("app-settings.local.json", true)
.AddJsonFile("app-settings.json", false)
.Build();
serviceCollection.Configure<ConfigurableSettings>(options => configuration.GetSection("AppSettings").Bind(options));
serviceCollection.Configure<ConfigurableSettings>(options => configuration.GetSection("DgeSettings").Bind(options));
var services = serviceCollection.BuildServiceProvider();
var options = services.GetService<IOptions<ConfigurableSettings>>();
serviceCollection.AddLogging(loggingBuilder =>
{
loggingBuilder.AddConfiguration(configuration.GetSection("Logging"));
loggingBuilder.AddConsole();
loggingBuilder.AddDebug();
});
serviceCollection.AddServices(configuration);
serviceCollection.AddNopCommerceServices(configuration);
serviceCollection.AddTransient<Comparator>();
serviceCollection.AddTransient<UpdateManager>();
serviceCollection.AddTransient<DgeRequestAuthenticator>();
serviceCollection.AddTransient<ISourceConnector, DgeConnector>();
serviceCollection.AddTransient<IDestinationConnector, NopCommerceConnector>();
}我的app-setings.local.json配置如下：
{
"AppSettings": {
"SoftDelete": true
},
"DgeSettings": {
"zipFileUrl" : "www.example-url.com",
"sourceFileUrl" : "www.example-url.com"
}
}当我试图在类中使用它时，我在构造函数中调用它，如下所示：
private readonly ConfigurableSettings _settings;
public AlphaBetaService(IOptions<ConfigurableSettings> settings)
{
_settings = settings.Value;
}有人能帮我找出我做错了什么吗？
回答 1
Stack Overflow用户
发布于 2021-06-15 02:32:56
不确定如何在项目中使用ConfigureServices方法，实际上，Startup.cs中的ConfigureServices必须是无参数的，或者只能接受IServiceCollection类型的一个参数。
将您的ConfigureServices更改如下：
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
var configuration = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("app-settings.local.json", true)
.Build();
services.Configure<ConfigurableSettings>(configuration);
//...
}
}还可以更改模型设计，如下所示：
public class ConfigurableSettings
{
public AppSettings AppSettings{ get; set; }
public DgeSettings DgeSettings { get; set; }
}
public class AppSettings
{
[JsonProperty("SoftDelete")]
public bool SoftDelete { get; set; }
}
public class DgeSettings
{
[JsonProperty("zipFileUrl")]
public string zipFileUrl { get; set; }
[JsonProperty("sourceFileUrl")]
public string sourceFileUrl { get; set; }
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/67972780
复制相关文章
相似问题
腾讯云开发者
