如何在同一appsettings.json文件中引用另一个值? [英] How to reference another value within the same appsettings.json file?

问题描述

我需要在appsettings.json中的两个地方添加数据库连接字符串.

I need database connection string in two places in appsettings.json.

是否可以在json文件中引入与变量或json路径相关的公共引用，以避免潜在的问题?

Is it possible to introduce common variable or json-path related references into json file to avoid potencial problems?

不用触摸c#代码就能拥有它.

It would be lovely to have it without touching c# code.

{
...
  "ConnectionStrings": {
    "Default": "Host=localhost;Database=db;Port=5432;Username=postgres;Password=postgres"
  },
  "Nlog": {
    "targets": {
      "database": {
        "type": "Database",
        "dbProvider": "Npgsql.NpgsqlConnection, Npgsql",
        "connectionString": "Host=localhost;Database=db;Port=5432;Username=postgres;Password=postgres",
...
      }
    }
...
}

推荐答案

NLog可以在appsettings.json中查找值.您可以使用${configsetting}这样完成:

NLog has the ability to lookup values in the appsettings.json. You can do it like this with ${configsetting}:

{
...
  "ConnectionStrings": {
    "Default": "Host=localhost;Database=db;Port=5432;Username=postgres;Password=postgres"
  },
  "Nlog": {
    "targets": {
      "database": {
        "type": "Database",
        "dbProvider": "Npgsql.NpgsqlConnection, Npgsql",
        "connectionString": "${configsetting:item=ConnectionStrings.Default}",
...
      }
    }
...
}

另请参见 https://github.com/NLog/NLog/wiki /ConfigSetting-Layout-Renderer

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