乾貨：.net core實現讀取appsettings.json配置文件（建議收藏）

時間 2019-11-06

標籤乾貨 core 實現讀取 appsettings.json appsettings json 配置文件建議收藏欄目 JavaScript 简体版

原文原文鏈接

看好多人不懂在.NET CORE中如何讀取配置文件，我這裏分兩篇，這一篇介紹怎樣經過appsettings.json配置讀取文件信息。這裏我會教你們兩種方式：git

第一種直接放到通用類庫，那裏想調往那調。github

1.編輯咱們的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.通用類庫Common添加引用類庫Microsoft.Extensions.Configuration.Json並添加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 當appsettings.json被修改時從新加載            
                Configuration = new ConfigurationBuilder()
                .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
                .Build();
            }

        }
    }

3.調用app

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

第二種直接讀文件調用。測試

1.引用類庫並讀取文件獲取配置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"];
        }

簡單介紹下原理：spa

咱們經過ConfigurationBuilder對象來建立ConfigurationRoot對象，並用其來讀取配置。SetBasePath()方法是用來設置咱們配置對象須要的配置文件的基礎路徑，好比咱們將基礎路徑設置爲C:\TemplateCore\TemplateCore，那麼他讀取咱們的配置文件appsettings.json的路徑將是C:\TemplateCore\TemplateCore\appsettings.jsoncode

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

測試瀏覽效果：http://127.0.0.1:1994/home/TestAppSettings

幫助到你的話請點個推薦，謝謝。