将appsettings.json部分绑定到POCO列表

Question

鉴于这两类

public class SerilogSubLoggerConfigurations
{
    public List<SerilogSubLoggerConfiguration> SerilogConfigurations { get; set; }
}

public class SerilogSubLoggerConfiguration
{
    private string _pathFormat;

    public LogEventLevel Level { get; set; }

    public string PathFormat
    {
        get => _pathFormat;
        set => _pathFormat = value.Replace("%APPLICATION_NAME%", Environment.GetEnvironmentVariable("APPLICATION_NAME"));
    }
}

和apssettings.json部分看起来像这样

 "Serilog": {
    "SubLogger": [
  {
    "Level": "Information",
    "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Information/log-{Date}.log"
  },
  {
    "Level": "Warning",
    "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Warning/log-{Date}.log"
  },
  {
    "Level": "Critical",
    "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Critical/log-{Date}.log"
  }
],
 }

我想将SubLogger部分绑定到SerilogSubLoggerConfigurations类。 我似乎无法弄清楚如何获得此配置以使用三个项目（类型为SerilogSubLoggerConfiguration ）创建该类。

Answer 1

在Json config中，子记录器对象的数组称为SubLogger但在配置POCO SerilogSubLoggerConfigurations它称为SerilogConfigurations 。 这就是配置绑定器无法匹配它们的原因。

在ASP.NET Core中，（至少目前）无法更改映射属性的名称，它们应与配置节的名称匹配。 查看此答案以获取详细信息。

因此，您应该只重命名POCO属性或JSON节名称。 在您的情况下， SubLoggers似乎是最合适的名称：

public class SerilogSubLoggerConfigurations
{
    public List<SerilogSubLoggerConfiguration> SubLoggers { get; set; }
}

{
  "Serilog": {
    "SubLoggers": [
      {
        "Level": "Information",
        "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Information/log-{Date}.log"
      },
      {
        "Level": "Warning",
        "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Warning/log-{Date}.log"
      },
      {
        "Level": "Critical",
        "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Critical/log-{Date}.log"
      }
    ]
  }
}

IConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("AppSettings.json");
IConfiguration configuration = configurationBuilder.Build();
SerilogSubLoggerConfigurations subLoggerConfigurations = configuration.GetSection("Serilog").Get<SerilogSubLoggerConfigurations>();

还有一张便条。 Serilog.Events.LogEventLevel枚举没有Critical级别，它具有Error和Fatal 。 这就是为什么这个项目

{
  "Level": "Critical",
  "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Critical/log-{Date}.log"
}

将无法正确加载。 您应该将其更改为：

{
  "Level": "Error",
  "pathFormat": "C:/Logs/Serilog/%APPLICATION_NAME%/Error/log-{Date}.log"
}