配置系统读取配置2

将配置映射成对象：

基础：Step1.新建项目：

 -- Config.Json

{
  "sql": {
    "oracle": "oracleoracleoracleoracleoracleoracle",
    "mysql": "mysqlmysqlmysqlmysqlmysqlmysqlmysqlmysql",
    "db2": "db2db2db2db2db2db2db2db2db2db2db2db2db2db2",
    "mssql": "mssqlmssqlmssqlmssqlmssqlmssqlmssqlmssql",
    "npgsql": "npgsqlnpgsqlnpgsqlnpgsqlnpgsqlnpgsql"
  },
  "nosql": {
    "mongodb": "mongodbmongodbmongodb",
    "redis": "redisredisredisredisredis"
  }
}

 -- Program.cs

添加NUGET：

Install-Package Microsoft.Extensions.Configuration 

Install-Package Microsoft.Extensions.Configuration.Json

Install-Package Microsoft.Extensions.Configuration.Binder

using Microsoft.Extensions.Configuration; 

ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("Config.json", true/*防止读取出错*/, true/*文件变更重新加载*/);//加载文件
IConfigurationRoot configurationRoot = configurationBuilder.Build();

Sql sql= configurationRoot.GetSection("sql").Get<Sql>(); 
NoSql noSql = configurationRoot.GetSection("nosql").Get<NoSql>();

Console.WriteLine("sql："+sql.db2);
Console.WriteLine("NoSql：" + noSql.Mongodb);

class Sql
{
    public string MySql { get; set; }
    public string Oracle { get; set; }
    public string mssql { get; set; }
    public string db2 { get; set; }
    public string npgsql { get; set; } 
}
class NoSql
{
    public string Mongodb { get; set; }
    public string Redis { get; set; }
}

查看输出结果

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进阶：修改配置文件

{
  "name": "zhangsan",
  "age": 18,
  "classInfo": {
    "teacher": "Miss Wang",
    "className": "grade one",
    "seat": [2,8] 
  } 
}

-- Program.cs

using Microsoft.Extensions.Configuration; 

ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
configurationBuilder.AddJsonFile("Config.json", true/*防止读取出错*/, true/*文件变更重新加载*/);//加载文件
IConfigurationRoot configurationRoot = configurationBuilder.Build();

Student stu = configurationRoot.Get<Student>();
Console.WriteLine(stu.ToString());
Console.WriteLine(stu.classInfo.ToString());
 
class Student 
{
    public string Name { get; set; }
    public int Age { get; set; }
    public ClassInfo classInfo { get; set; }

    public override string ToString()
    {
        return $"我是{Name},今年{Age}岁";
    }
}
class ClassInfo
{
    public string Teacher { get; set; }
    public string ClassName { get; set; }
    public int[] Seat { get; set; }
    public override string ToString() 
    {
        return $"老师是{Teacher} 班级：{ClassName} 坐在第{Seat[0]}排第{Seat[1]}列";
    }
}

再来看输出：