在早期版本中，我們有 Startup.cs 類，我們在啟動檔案中得到如下配置物件。
public class Startup
{
private readonly IHostEnvironment environment;
private readonly IConfiguration config;
public Startup(IConfiguration configuration, IHostEnvironment environment)
{
this.config = configuration;
this.environment = environment;
}
public void ConfigureServices(IServiceCollection services)
{ ... }
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{ ... }
}
現在在 .NET 6（使用 Visual Studio 2022）中，我們看不到 Startup.cs 類。它完全被洗掉了。那么我們如何獲得這些物件，如 Configuration(IConfiguration) 和 Hosting Environment(IHostEnvironment)
我們如何獲得這些物件，比如說從 appsetngs 中讀取配置？目前 Program.cs 檔案看起來像這樣。
using Festify.Database;
using Microsoft.EntityFrameworkCore;
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddDbContext<FestifyContext>();
////////////////////////////////////////////////
// The following is Giving me error as Configuration
// object is not avaible, I dont know how to inject this here.
////////////////////////////////////////////////
builder.Services.AddDbContext<FestifyContext>(opt =>
opt.UseSqlServer(
Configuration.GetConnectionString("Festify")));
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();
我想從 appsettings 檔案中讀取配置。
uj5u.com熱心網友回復：
WebApplicationBuilder由WebApplication.CreateBuilder(args)公開Configuration和Environment屬性回傳：
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
...
ConfigurationManager configuration = builder.Configuration;
IWebHostEnvironment environment = builder.Environment;
WebApplication回傳的WebApplicationBuilder.Build()也暴露Configuration和Environment：
var app = builder.Build();
IConfiguration configuration = app.Configuration;
IWebHostEnvironment environment = app.Environment;
另請查看遷移指南和代碼示例。
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標籤：C＃ asp.net核心 .net-6.0 视觉工作室2022 c#-10.0
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