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)

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