vs 中C#项目读取JSON配置文件的方法

config.json 文件内容如下

{
"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"
}

设置配置文件

项目config.json文件右键——属性——将“复制到输出目录”项的值改为“始终复制”

添加引用

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、获取 ConnectionString 对应的字符串
va = "Data:DefaultConnection:ConnectionString";
// 2、获取 Name 对应的字符串
va = "Appsettings:Name";
// 3、获取 url 对应的字符串
va = "url";

GetConnectionString(va)

来源：https://blog.csdn.net/weixin_42686768/article/details/105595689