ok！步入正题,下面来说一下如何读取json配置文件中的参数。
第一种:使用iconfiguration接口
我们先在appsettings.json中配置好数据库连接字符串,然后读取它
{ connection: { dbcontent: data source=.;initial catalog=test;user id=sa;password=123456 }, logging: { loglevel: { default: information, microsoft: warning, microsoft.hosting.lifetime: information } }, allowedhosts: *}
在控制器中注入iconfiguration接口
using system;using system.collections.generic;using system.linq;using system.threading.tasks;using microsoft.aspnetcore.mvc;using microsoft.extensions.configuration;namespace read.json.controllers{ [apicontroller] [route([controller])] public class readcontroller : controller { private iconfiguration _configuration; public readcontroller(iconfiguration configuration) { _configuration = configuration; } [httppost] public async task<string> readjson() { //读参 string conn = _configuration[connection:dbcontent]; return ; } }}
当然也可以读取数组形式的json,一样的先在appsettings.json中写好配置参数，如下：
{ connection: { dbcontent: data source=.;initial catalog=test;user id=sa;password=123456 }, //------------------------ content: [ { trade_name: { test1: 小熊饼干, test2: 旺仔qq糖, test3: 娃哈哈牛奶 } } ], //------------------------ logging: { loglevel: { default: information, microsoft: warning, microsoft.hosting.lifetime: information } }, allowedhosts: *}
比如我们想读取test1
string commodity_test1 = _configuration[content:0:trade_name:test1];
第二种：使用ioptions<t>来读取json配置文件
先把nuget包导进项目：microsoft.extensions.options.configurationextensions
首先在appsettings.json中添加节点如下
{ connection: { dbcontent: data source=.;initial catalog=test;user id=sa;password=123456 }, //------------------------ content: [ { trade_name: { test1: 小熊饼干, test2: 旺仔qq糖, test3: 娃哈哈牛奶 } } ], //------------------------ logging: { loglevel: { default: information, microsoft: warning, microsoft.hosting.lifetime: information } }, allowedhosts: *, //============================== information: { school: { introduce: { name: 实验小学, class: 中班, number: 15人 }, region: { province: 湖北, city: 武汉, area: 洪山区 }, detailed_address: [ { address: 佳园路207号 } ] } } //==============================}
然和再建立一个与这个节点相同的类
using system;using system.collections.generic;using system.linq;using system.threading.tasks;namespace read.json{ public class information { public school school { get; set; } } public class school { public introduce introduce { get; set; } public region region { get; set; } public list<detailed_address> data { get; set; } } public class introduce { public string name { get; set; } public string class { get; set; } public string number { get; set; } } public class region { public string province { get; set; } public string city { get; set; } public string area { get; set; } } public class detailed_address { public string address { get; set; } }}
在startup中添加如下代码
#region 服务注册,在控制器中通过注入的形式使用 services.addoptions(); services.configure<information>(configuration.getsection(information)); #endregion
控制器中使用：
{ connection: { dbcontent: data source=.;initial catalog=test;user id=sa;password=123456 }, //------------------------ content: [ { trade_name: { test1: 小熊饼干, test2: 旺仔qq糖, test3: 娃哈哈牛奶 } } ], //------------------------ logging: { loglevel: { default: information, microsoft: warning, microsoft.hosting.lifetime: information } }, allowedhosts: *, //============================== information: { school: { introduce: { name: 实验小学, class: 中班, number: 15人 }, region: { province: 湖北, city: 武汉, area: 洪山区 }, detailed_address: [ { address: 佳园路207号 } ] } } //==============================}
第三种：这种应该比较常见,任意读取自定义的json文件
首先建立一个json文件
{ system_version: { edition: .net core 3.0, project_name: read.json }}
再建一个类,封装一个方法
using microsoft.extensions.configuration;using system;using system.collections.generic;using system.linq;using system.threading.tasks;namespace read.json{ public class json_file { public iconfigurationroot read_json_file() { //这句代码会读取read_json.json中的内容 return new configurationbuilder().addjsonfile(read_json.json) .build(); } }}
在控制器中调用：
[httpget] public async task<iactionresult> readsystemversion() { var configuration = _json_file.read_json_file(); string system = 使用的是 + configuration[system_version:edition] + 的版本 + , + 项目名称是 + configuration[system_version:project_name]; return json(new { data = system }); }
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以上就是.net core如何读取json配置文件的详细内容。