{
 "WebConfig": {
  "OracleConnectionString": "User Id=fjh;Password=fjh_123;Data Source=(DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521)))(CONNECT_DATA = (SERVICE_NAME = orcl)));Pooling = True;Max Pool Size = 800;Min Pool Size = 1;Connect Timeout=5;"
 },
 "Logging": {
  "LogLevel": {
   "Default": "Warning"
  }
 },
 "AllowedHosts": "*"
}

using Microsoft.Extensions.Configuration;

namespace Read_Configuration_File
{
  public class ConfigurationHelper
  {
    private static IConfiguration _config;
    public static void Configure(IConfiguration config)
    {
      _config = config;
    }
    /// <summary>
    /// 根据配置文件键读取对应的值
    /// </summary>
    /// <param name="Key"></param>
    /// <returns></returns>
    public static string GetConfigValueByKey(string Key)
    {
      var value = _config[Key];
      return value;
    }
  }
}

namespace Read_Configuration_File
{
  public static class UtilConfig
  {
    public static string OracleConnectionString => ConfigurationHelper.GetConfigValueByKey("WebConfig:OracleConnectionString") == null "" : string.Format(ConfigurationHelper.GetConfigValueByKey("WebConfig:OracleConnectionString"));
  }
}

namespace Read_Configuration_File
{
  public class ConnectionRead
  {
    /// <summary>
    /// 定义一个静态方法获取连接字符串
    /// </summary>
    /// <returns></returns>
    public static string GetConnectionStr()
    {
      var connStr = UtilConfig.OracleConnectionString;
      return connStr;
    }
  }
}