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无法从ASP中的应用程序设置加载选项。NET Core站点使用IOptions

appsettings asp.net-core c#

SteinTech · 技术社区 · 4 月前

我正试图从ASP中的appsettings文件加载数据。NET核心项目。我以前做过,但现在我做不到。此外,我试图配置一个名为Images的部分,并将其绑定到WorkImageOptions类型的对象,该对象包含有关图像集合的信息。

我尝试使用IOptionsSnapshot检索值,但如果设置部分有数据,则始终为空。

程序cs :

using SLT.Bohem63.Peachie.Config;

WebApplicationBuilder builder = WebApplication.CreateBuilder(args);
builder.Services
    .Configure<WorkImageOptions>(builder.Configuration.GetSection(WorkImageOptions.SectionName));

builder.Services.AddControllersWithViews();

WebApplication app = builder.Build();

app.UseRouting();
app.MapStaticAssets();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Bohem63}/{action=Index}/{id?}")
    .WithStaticAssets();

app.Run();

WorkImageOptions.cs :

public sealed class WorkImageOptions
{
    public IEnumerable<WorkImageInfo> Images { get; set; }

    public static string SectionName => "Images";
}

WorkImageInfo.cs :

namespace SLT.Bohem63.Peachie.Models.Data
{
    public interface IWorkImageInfo
    {
        string Filename { get; set; }
        string Title { get; set; }
        string Description { get; set; }
        int Likes { get; set; }
    }

    public sealed class WorkImageInfo : IWorkImageInfo
    {
        public string Filename { get; set; }
        public string Title { get; set; }
        public string Description { get; set; }
        public int Likes { get; set; } = 0;
    }
}

检索选项 :

public class Bohem63Controller(IOptionsSnapshot<WorkImageOptions> options) : Controller { }

应用程序参数 :

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "Images": {
    "filename": "pic1.jpg",
    "title": "",
    "description": "",
    "likes": 0
  }
}

1 回复 | 直到 4 月前

Ivan Petrov 4 月前

在当前的结构下,apps.json必须看起来像这样才能工作:

"Images": {
  "Images": [
    {
      "filename": "foo.jpg",
      "title": "bar",
      "description": "baz",
      "likes": 42
    }
  ]
}

虽然我会通过摆脱 SectionName 财产和使用 nameof 改为类名:

builder.Services
    .Configure<WorkImageOptions>(builder.Configuration.GetSection(nameof(WorkImageOptions)));

应用设置:

"WorkImageOptions": {
  "Images": [
    {
      "filename": "foo.jpg",
      "title": "bar",
      "description": "baz",
      "likes": 42
    }
  ]
}