干貨：.net core實作讀取appsettings.json組態檔（建議收藏）-有解無憂

看好多人不懂在.NET CORE中如何讀取組態檔，我這里分兩篇，這一篇介紹怎樣通過appsettings.json配置讀取檔案資訊，這里我會教大家兩種方式：

第一種直接放到通用類別庫，那里想調往那調，

1.編輯我們的appsettings.json檔案

{
  "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.通用類別庫Common添加參考類別庫Microsoft.Extensions.Configuration.Json并添加AppSettingsHelper.cs

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被修改時重新加載            
                Configuration = new ConfigurationBuilder()
                .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
                .Build();
            }

        }
    }

3.呼叫

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

第二種直接讀檔案呼叫，

1.參考類別庫并讀取檔案獲取配置

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：

我們通過ConfigurationBuilder物件來創建ConfigurationRoot物件，并用其來讀取配置，SetBasePath()方法是用來設定我們配置物件需要的組態檔的基礎路徑，比如我們將基礎路徑設定為C:\TemplateCore\TemplateCore，那么他讀取我們的組態檔appsettings.json的路徑將是C:\TemplateCore\TemplateCore\appsettings.json

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

測驗瀏覽效果：http://127.0.0.1:1994/home/TestAppSettings

幫助到你的話請點個推薦，謝謝，

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標籤：.NET Core

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