如何在自定义ConfigurationProvider中访问DI [英] How to access DI inside custom ConfigurationProvider
问题描述
我正在实现自定义ConfigurationProvider,并且具有以下扩展方法
I am implementing a custom ConfigurationProvider and I have the following extension method in place
public static class ConfigurationExtensions
{
public static IConfigurationBuilder AddConfigProviderConfiguration(this IConfigurationBuilder configuration)
{
configuration.Add(new ConfigurationSource());
return configuration;
}
}
我正在这样调用扩展方法
And I am calling the extension method like this
return new ServiceCollection().AddConfigProviderServices()
这是ConfigurationSource类
This is the ConfigurationSource class
public class ConfigurationSource : IConfigurationSource
{
public IConfigurationProvider Build(IConfigurationBuilder builder)
{
return new ConfigurationProvider(this);
}
}
在ConfigurationProvider内部,我希望能够注入或以某种方式访问已注册为DI的依赖项(如ILogger).如何访问依赖项?
Inside the ConfigurationProvider I would like to be able to inject or somehow access dependencies like ILogger, that I have registered as DI. How can I access the dependencies?
推荐答案
我最终在ConfigurationProvider类中添加了另一个加载方法,该方法将IServiceProvider作为这样的参数:
I ended up adding another load method inside the ConfigurationProvider class that takes in IServiceProvider as a parameter like this:
public class ConfigurationProvider : Microsoft.Extensions.Configuration.ConfigurationProvider
{
public void Load(IServiceProvider serviceProvider)
{
var logger = serviceProvider.GetRequiredService<ILogger<ConfigurationProvider>>();
// Get other services using serviceProvider, e.g. dbContext and call Set(s.Key, s.Value); accordingly
在启动ServiceProvier之后,下一步调用自定义加载方法,并将其作为这样的参数传递:
Next call the custom load method after ServiceProvier has been initiated and pass it in as a parameter like this:
[TestInitialize()]
public void InitializeTest()
{
var config = new ConfigurationBuilder()
.SetBasePath(Directory
.GetCurrentDirectory()) //From NuGet Package Microsoft.Extensions.Configuration.Json
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddConfigProviderConfiguration()
.Build();
serviceProvider = ServiceProvider.BuildDi(config);
var loggerFactory = serviceProvider.GetService<ILoggerFactory>();
loggerFactory.AddProvider(new LoggerProvider(config));
var provider = config.Providers.FirstOrDefault(p => p is ConfigurationProvider);
var cp = (ConfigurationProvider)provider;
cp.Load(serviceProvider);
}
不是最好的解决方案,但它可以工作,并且可以从ConfigurationProvider中访问所有DI依赖项.
Not the nicest solution but it works and all the DI dependencies are accessible from within ConfigurationProvider.
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