dotnet appsettings 配置文件读取

Console.Config\Program.cs

using Microsoft.Extensions.Configuration;

var basePath = Directory.GetCurrentDirectory();

var configuration = new ConfigurationBuilder()
    .SetBasePath(basePath) // 设置基本路径
    .AddJsonFile("appsettings.json") // 添加配置文件
    .Build();


var dataProvider = configuration["DataProvider"] ?? throw new InvalidOperationException("DataProvider在appsettings.json未发现");
var connection  =   configuration.GetConnectionString(dataProvider)?? throw new InvalidOperationException($"{dataProvider}在appsettings.json未发现");


System.Console.WriteLine(connection);

Console.Config\appsettings.json

{
  "ConnectionStrings": {
    "MsSqlConnectionDev": "Data Source=localhost;Initial Catalog=test6;User ID=sa;Password=s11233012..;Trust Server Certificate=True",
    "MsSqlConnection": "Server=localhost;Database=Electric;Uid=root;Pwd=123456;"
  },
  "DataProvider": "MsSqlConnection"
}