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)

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