.net core (.net6) 讀取配置文件 appsettings.json

.net core (.net6) 讀取配置文件 appsettings.json

新建個工具類，方便其它地方使用，代碼如下
AppHelper:

namespace net6mvc.Utils
{
public class AppHelper
{
private static IConfiguration _config;

public AppHelper(IConfiguration configuration)
{
_config = configuration;
}

/// <summary>
/// 讀取指定節點的字符串
/// </summary>
/// <param name="sessions"></param>
/// <returns></returns>
public static string ReadAppSettings(params string[] sessions)
{
try
{
if (sessions.Any())
{
return _config[string.Join(":", sessions)];
}
}
catch
{
return "";
}
return "";
}

/// <summary>
/// 讀取實體信息
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="session"></param>
/// <returns></returns>
public static List<T> ReadAppSettings<T>(params string[] session)
{
List<T> list = new List<T>();
_config.Bind(string.Join(":", session), list);
return list;
}
}
}

appsettings.json 示例如下：

{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"AllowedHosts": "*",
"AppVer": "2022-01-13 21:54",
"Test": {
"A": "Hello",
"B": {
"C": "World"
}
}
}

修改Program.cs
在CreateBuilder前增加
using net6mvc.Utils;

IConfiguration configuration = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.Build();

在 CreateBuilder 后增加
builder.Services.AddSingleton (new AppHelper(configuration));

完整代碼：

using net6mvc.Utils;

IConfiguration configuration = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.Build();

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();

builder.Services.AddSingleton (new AppHelper(configuration));

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Home/Error");
}
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();

使用
public IActionResult Index()
{
string a = AppHelper.ReadAppSettings("Test", "A");
string b = AppHelper.ReadAppSettings("Test", "B", "C");
ViewBag.Test1 = $"{a} ***** {b}";
string AppVer = AppHelper.ReadAppSettings("AppVer");
ViewBag.AppVer = AppVer;
return View();
}