config.json 檔案內容如下

{
	"Data": 
	{
		"DefaultConnection": 
		{
			"ConnectionString": "Server=(localdb)\\MSSQLLocalDB;Database=Books;Trusted_Connection=True;"
		}
	},"Appsettings": 
	{
 "Name": "XiaoLi","Date": "2020-04-18","age": "20"
 },"url":"https://blog.csdn.net/weixin_42686768"
}

設定配置檔案

專案config.json檔案右鍵——屬性——將“複製到輸出目錄”項的值改為“始終複製”

新增引用

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
using System.IO;

public static string GetConnectionString(string value)
{
 var configurationBuilder = new ConfigurationBuilder()
 .SetBasePath(Directory.GetCurrentDirectory())
 .AddJsonFile("config.json");

 //var configurationBuilder = new ConfigurationBuilder()
 // .Add(new JsonConfigurationSource { Path = "config.json",ReloadOnChange = true });

 IConfiguration config = configurationBuilder.Build();
 string connectionString = config[value];
 return connectionString;
}

// 1、獲取 ConnectionString 對應的字串
va = "Data:DefaultConnection:ConnectionString";
// 2、獲取 Name 對應的字串
va = "Appsettings:Name";
// 3、獲取 url 對應的字串
va = "url";

GetConnectionString(va)

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