netcore3.0 IConfiguration配置源码解析(四)

前面三篇介绍了netcore的配置系统，现在我们自己做个扩展

先定义source和provider

public class MyConfigurationSource : IConfigurationSource
    {
        public IDictionary<string, string> Data { get; set; }
        public IConfigurationProvider Build(IConfigurationBuilder builder)
        {
            return new MyConfigurationProvider(this);
        }
    }

public class MyConfigurationProvider : ConfigurationProvider
    {
        public MyConfigurationProvider(MyConfigurationSource soure)
        {
            if (soure == null)
                throw new ArgumentException(nameof(soure));

            if (soure.Data == null)
                throw new ArgumentException(nameof(soure.Data));

            foreach (var item in soure.Data)
            {
                Data.Add(item.Key, item.Value);
            }
        }
    }

再扩展IConfigurationBuilder

public static class MyConfigurationExtension
    {
        public static IConfigurationBuilder AddMyConfiguration(this IConfigurationBuilder configurationBuilder,
            IDictionary<string, string> data)
        {
            return configurationBuilder.Add<MyConfigurationSource>(source => { source.Data = data; });
        }
    }

如下调用

class Program
    {
        static void Main(string[] args)
        {
            var builder = new ConfigurationBuilder();
            builder.AddMyConfiguration(new Dictionary<string, string>() {{"Name", "Test"}});
            var configuration = builder.Build();
            var value = configuration["name"];
            Console.WriteLine(value);
            Console.Read();

        }
    }

上面简单介绍了如何自定义自己的配置，掌握原理方法，可以根据具体需求实现自己的配置源