.net core 学习笔记（5）-配置文件读取

1.在appsetting下新增一个配置节点：

"KeyStrings": {
    "key": "abc",
    "value": "test"
  },

2.新增类文件 KeyStrings.cs

public class KeyStrings{
  public string key{get;set}
  public string value{get;set;}
}

3.添加读取配置文件的类及接口文件KeyReposiroty.cs,IKeyRepository.cs

public class KeyReposiroty:IKeyReposiroty
{

  protected readonly   KeyStrings _keystrings;
  public KeyReposiroty(IOptions<KeyStrings> keystrings){
    _keystrings=keystrings
  }

  public virtual KeyStrings MyKeyStrings
        {
            get
            {
                return _keystrings;
            }
        }

}

public interface IKeyReposiroty
{

   KeyStrings MyKeyStrings{get;}

}

4.新增扩展方法

public static IServiceCollection GetKeyString(this IServiceCollection services, IConfigurationSection configuration)
        {
            services.Configure<KeyStrings>(configuration);
            services.AddSingleton<IKeyRepository,KeyRepository>(); //无接口的时候进行类的注入：services.AddSingleton<KeyRepository>();

　　　　　　　　return services;　　　　}

5.在Startup中调用扩展方法进行依赖注入　　

public void ConfigureServices(IServiceCollection services)
{             services.GetKeyString(Configuration.GetSection("KeyStrings")); 

}

6.现在通过IkeyRepository的MyKeyStrings就能访问到配置文件中配置节点的信息