将postgres docker实例连接到dotnet core 3.1会给出“提供的节点名或服务名，或未知错误” 其他信息

如何解决将postgres docker实例连接到dotnet core 3.1会给出“提供的节点名或服务名，或未知错误” 其他信息

我使用docker与以下docker-compose文件启动了postgres sql

version: '3.8'
  services:
    db:
      image: postgres:latest
      container_name: quoters
      ports:
        - 5432:5432
      environment:
        POSTGRES_USER: ${POSTGRES_USER:-postgres}
        POSTGRES_PASSWORD: ${POSTGRES_PASSWORD:-password}
        POSTGRES_DB: quoters
      networks:
        - quoters
      volumes:
        - quoters:/data/db/quoters
        - ./database/init.sql:/docker-entrypoint-initdb.d/init.sql
      restart: always
  networks:
    quoters:
      driver: bridge

  volumes:
    quoters:

我正在尝试从我的dotnet核心webapi应用程序本地连接到此postgres sql实例。以下是我的appsettings.json

{
  "ConnectionStrings": {
  "DefaultConnection": 
     "host=db;port=5432;database=quoters;username=postgres;password=password"
  },"Logging": {
    "LogLevel": {
    "Default": "information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "information"
    }
  },"AllowedHosts": "*"
}

我获得connectionString，并在Startup.cs文件的以下行中使用

var connectionString = Configuration.GetConnectionString("DefaultConnection");
services.AddRepository(connectionString);

services.AddRepository(string)是我创建的扩展方法。然后，我在IsqlConnectionFactory实现中使用此connectionString。

当我尝试在API上测试Swagger时，出现以下错误

System.Net.Internals.socketExceptionFactory+ExtendedSocketException (00000005,0xFFFDFFFF): nodename nor servname provided,or not kNown
   at System.Net.Dns.InternalGetHostByName(String hostName)
   at System.Net.Dns.GetHostAddresses(String hostNameOrAddress)
   at Npgsql.NpgsqlConnector.Connect(NpgsqlTimeout timeout)
   at Npgsql.NpgsqlConnector.RawOpen(NpgsqlTimeout timeout,Boolean async,CancellationToken cancellationToken)
   at Npgsql.NpgsqlConnector.Open(NpgsqlTimeout timeout,CancellationToken cancellationToken)
   at Npgsql.ConnectorPool.AllocateLong(NpgsqlConnection conn,NpgsqlTimeout timeout,CancellationToken cancellationToken)
   at Npgsql.NpgsqlConnection.<>c__displayClass32_0.<<Open>g__OpenLong|0>d.MoveNext()

我似乎无法找出问题所在。（我感觉我的connectionString有点问题了）。请提供任何解决此问题的帮助

其他信息

我正在使用macOS Catalina版10.15.7

解决方法

将连接字符串更改为

"User ID=postgres;Password=changeme;Server=localhost;Port=5432;Database= quoters;Integrated Security=true;Pooling=true;"