最近因為在改專案，ASP.net 6 中，已經消失了 Startup.cs ，一切操作都在 Program.cs 中
這邊記錄一下，兩種方法讀取 appsettings.json 的值，筆記一下，看這走向應該 .Net7 不會再改了吧
應該吧...
首先，我得先提供一下，我的 appsettings.json 的狀況
<![CDATA[
{
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft.AspNetCore": "Warning"
}
},
"AllowedHosts": "*",
"UserData": {
"Id": "Dooooooooooooooooooooonmmmma",
"Name": "許當麻",
"Age": 99,
"Birth": "2023-01-30T19:01:55.714942+08:00"
},
"BasicViewPara": {
"Main": "red",
"Border": "black",
"Margin": 5
}
}
]]>
這裡面有兩個 section 是我加進去的一個是 UserData , 一個是 BasicViewPara
方法1 . 我單純要讀取 UserData 中 的 Id 的值
Program.cs
<![CDATA[
namespace Core6Tutorial
{
public class Program
{
public static string UserId { get; set; }
public static void Main(string[] args)
{
var builder = WebApplication.CreateBuilder(args);
//Result:
//Dooooooooooooooooooooonmmmma
UserId = builder.Configuration["UserData:Id"];
// Add services to the container.
builder.Services.AddRazorPages();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapRazorPages();
app.Run();
}
}
}
]]>
這樣就可以取到 Dooooooooooooooooooooonmmmma
方法2. 透過 AddService 帶入到 每一個 PageModel 中透過 CTOR 去取得
Program.cs
<![CDATA[
namespace Core6Tutorial
{
public class Program
{
public static void Main(string[] args)
{
var builder = WebApplication.CreateBuilder(args);
//Ｒead Data from appsettings.json
builder.Services.Configure<Models.BasicView>(
builder.Configuration.GetSection("BasicViewPara")
);
// Add services to the container.
builder.Services.AddRazorPages();
var app = builder.Build();
// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
app.UseExceptionHandler("/Error");
// The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
app.UseHsts();
}
else
{
app.UseStatusCodePagesWithReExecute("/CError/{0}");
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthorization();
app.MapRazorPages();
app.Run();
}
}
}
]]>
這裡面我有寫到一個簡單的物件 Models.BasicView.cs
<![CDATA[
namespace Core6Tutorial.Models
{
public class BasicView
{
public string Main { get; set; }
public string Border { get; set; }
public double Margin { get; set; }
}
}
]]>
在 PageModel 的部分
ReadAppsettingsData.cshtml.cs
<![CDATA[
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.RazorPages;
using Newtonsoft.Json;
namespace Core6Tutorial.Pages
{
public class ReadAppsettingsDataModel : PageModel
{
private readonly Models.BasicView _BasicViewSetting;
public ReadAppsettingsDataModel(Microsoft.Extensions.Options.IOptions<Models.BasicView> basicViewSetting)
{
_BasicViewSetting = basicViewSetting.Value;
}
public string Result {get;set;}
public void OnGet()
{
Result += JsonConvert.SerializeObject(_BasicViewSetting);
}
}
}
]]>
ReadAppsettingsData.cshtml
<![CDATA[
@page
@model Core6Tutorial.Pages.ReadAppsettingsDataModel
@{
}
@Html.Raw(Model.Result)
]]>
Result:
其實方法2是最近才這樣用的，以前的用法都 會在 Startup.cs 的時候就先把一些參數讀取出來放在記憶體中
reference:
https://stackoverflow.com/questions/46940710/getting-value-from-appsettings-json-in-net-core/46940811#46940811
https://stackoverflow.com/questions/73862437/how-to-create-startup-class-in-asp-net-core-6-mvc
https://learn.microsoft.com/en-us/aspnet/core/fundamentals/configuration/options?view=aspnetcore-6.0
