干货：.net core实现读取appsettings.json配置文件（建议收藏）

时间 2019-11-06

标签干货 core 实现读取 appsettings.json appsettings json 配置文件建议收藏栏目 JavaScript 繁體版

原文原文链接

看好多人不懂在.NET CORE中如何读取配置文件，我这里分两篇，这一篇介绍怎样经过appsettings.json配置读取文件信息。这里我会教你们两种方式：git

第一种直接放到通用类库，那里想调往那调。github

1.编辑咱们的appsettings.json文件sql

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "ConnectionStrings": {
    "TestConnection": "server=123;User ID=jiyuwu;Password=123456;database=jiyuwu;",
    "Redis": "127.0.0.1:6379"
  },
  "AllowedHosts": "*"
}

2.通用类库Common添加引用类库Microsoft.Extensions.Configuration.Json并添加AppSettingsHelper.csjson

Install-Package Microsoft.Extensions.Configuration.Json -Version 3.0.0

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
using System;
using System.Collections.Generic;
using System.Text;

namespace Common
{
        public class AppSettingsHelper
        {
            public static IConfiguration Configuration { get; set; }
            static AppSettingsHelper()
            {
                //ReloadOnChange = true 当appsettings.json被修改时从新加载            
                Configuration = new ConfigurationBuilder()
                .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
                .Build();
            }

        }
    }

3.调用app

string sqlString= AppSettingsHelper.Configuration.GetConnectionString("TestConnection");
string sqlString1 = AppSettingsHelper.Configuration["Logging:LogLevel:Default"];

第二种直接读文件调用。测试

1.引用类库并读取文件获取配置ui

Install-Package Microsoft.Extensions.Configuration.Json -Version 3.0.0

public IConfiguration Configuration;
public void TestAppSettings()
        {
            var builder = new ConfigurationBuilder()
               .SetBasePath(Directory.GetCurrentDirectory())
               .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
            Configuration = builder.Build();
            string sqlString2 = Configuration["Logging:LogLevel:Default"];
        }

简单介绍下原理：spa

咱们经过ConfigurationBuilder对象来建立ConfigurationRoot对象，并用其来读取配置。SetBasePath()方法是用来设置咱们配置对象须要的配置文件的基础路径，好比咱们将基础路径设置为C:\TemplateCore\TemplateCore，那么他读取咱们的配置文件appsettings.json的路径将是C:\TemplateCore\TemplateCore\appsettings.jsoncode

开源地址：https://github.com/jiyuwu/TemplateCoreorm

测试浏览效果：http://127.0.0.1:1994/home/TestAppSettings

帮助到你的话请点个推荐，谢谢。