将 appsettings.json 部分绑定到 POCO 列表

Question

鉴于这两个 classes

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"));
    }
}

和一个看起来像这样的 apssettings.json 部分

 "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 class。我似乎无法弄清楚如何获得此配置以使用三个项目（SerilogSubLoggerConfiguration 类型）创建 class。

Answer 1

在 Json 配置中，您的子记录器对象数组称为 SubLogger，但在配置 POCO SerilogSubLoggerConfigurations 中称为 SerilogConfigurations。这就是配置活页夹无法匹配它们的原因。

在 ASP.NET Core 中，不可能（至少目前）更改映射属性的名称，它们应该与配置部分的名称相匹配。查看此 answer 了解详细信息。

所以您应该重命名 POCO 属性或 JSON 部分名称。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>();

再补充一点。 Serilog.Events.LogEventLevel 枚举没有 Critical 级别，它有 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"
}

将 appsettings.json 部分绑定到 POCO 列表

Binding an appsettings.json section to a list of POCO

c#

configuration

json

poco

asp.net-core