标签:选项 NetCore IOptionsMonitor 更新 public IServiceCollection OrderService services op
1. 关键类型
- IOptionsMonitor<out TOptions>
- IOptionsSnapshot<out TOptions>
2. 场景
- 范围作用域类型(AddScoped)使用 IOptionsSnapshot
- 单例服务(AddSingleton)使用 IOptionsMonitor
3. 通过代码更新选项
- IPostConfigureOptions<TOptions>
4. IOptionsSnapshot热更新代码
public interface IOrderService
{
int ShowMaxCount();
}
public class OrderService : IOrderService
{
IOptionsSnapshot<OrderServiceOptions> _options;
public OrderService(IOptionsSnapshot<OrderServiceOptions> options)
{
this._options = options;
}
public int ShowMaxCount()
{
return _options.Value.MaxCount;
}
}
public class OrderServiceOptions
{
public int MaxCount { get; set; } = 100;
}
public void ConfigureServices(IServiceCollection services)
{
services.Configure<OrderServiceOptions>(Configuration.GetSection("OrderService"));
services.AddScoped<IOrderService, OrderService>();
services.AddControllers();
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" });
});
}
5. IOptionsMonitor热更新代码
public interface IOrderService
{
int ShowMaxCount();
}
public class OrderService : IOrderService
{
IOptionsMonitor<OrderServiceOptions> _options;
public OrderService(IOptionsMonitor<OrderServiceOptions> options)
{
this._options = options;
}
public int ShowMaxCount()
{
return _options.CurrentValue.MaxCount;
}
}
public class OrderServiceOptions
{
public int MaxCount { get; set; } = 100;
}
public void ConfigureServices(IServiceCollection services)
{
services.Configure<OrderServiceOptions>(Configuration.GetSection("OrderService"));
services.AddSingleton<IOrderService, OrderService>();
services.AddControllers();
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" });
});
}
6. IOptionsMonitor监听配置变化
备注1:IOptionsSnapshot不支持监听配置变化
备注2:核心代码如下,其余代码在原有基础不变
public OrderService(IOptionsMonitor<OrderServiceOptions> options)
{
this._options = options;
_options.OnChange(option =>
{
Console.WriteLine($"配置发生了变化:{option.MaxCount}");
});
}
7. 简化服务注册代码
把服务注册的代码,放在静态扩展方法中
namespace Microsoft.Extensions.DependencyInjection
{
public static class OrderServiceExtensions
{
public static IServiceCollection AddOrderService(this IServiceCollection services,
IConfiguration configuration)
{
services.Configure<OrderServiceOptions>(configuration);
services.AddSingleton<IOrderService, OrderService>();
return services;
}
}
}
public void ConfigureServices(IServiceCollection services)
{
services.AddOrderService(Configuration.GetSection("OrderService"));
services.AddControllers();
services.AddSwaggerGen(c =>
{
c.SwaggerDoc("v1", new OpenApiInfo { Title = "NET_Core", Version = "v1" });
});
}
8. 动态配置
public static class OrderServiceExtensions
{
public static IServiceCollection AddOrderService(this IServiceCollection services,
IConfiguration configuration)
{
services.Configure<OrderServiceOptions>(configuration);
//从配置文件读取后,还要再给他加100
services.PostConfigure<OrderServiceOptions>(options =>
{
options.MaxCount += 100;
});
services.AddSingleton<IOrderService, OrderService>();
return services;
}
}
标签:选项,NetCore,IOptionsMonitor,更新,public,IServiceCollection,OrderService,services,op 来源: https://blog.csdn.net/hahahzzzzz/article/details/118915220
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