ASP.NET Core裡面有一項功能我覺得挺實用的稍為作筆記一下，ASP.NET Core的Options Pattern可以將組態資料繫結到【類別】，透過程式再去存取類別，使得程式不直接相依組態系統。
Option兩個條件狀況
- 必須為非抽象類別
- 建構函數必須為public且無參數
首先先透過appsetting.json的Developer區段設定值，不直接存取組態，而是透過Options選項模式讀取組態設定。
{
"Developer": {
"Name": "eddie",
"Email": "eddie@gmail.com",
"WebSite": "http://www.google.com.tw"
},
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}
建立DeveloperOption類別，三個屬性名稱與組態對應。 Options/DeveloperOptions.csharp
public class DeveloperOptions
{
public string Name { get; set; }
public string Email { get; set; }
public string WebSite { get; set; }
}
Startup.cs中註冊ConfigureServices註冊Options類別去對應組態設定。
public void ConfigureServices(IServiceCollection services)
{
services.Configure<DeveloperOptions>(o =>
Configuration.GetSection("Developer").Bind(o));
services.AddControllersWithViews();
}
@using WebMVCDemo.Options;
@using Microsoft.Extensions.Options;
@inject IOptionsMonitor<DeveloperOptions> developerOptions
@{
ViewData["Title"] = "Home Page";
var devoptions = developerOptions.CurrentValue;
}
<div class="text-center">
<h1 class="display-4">Welcome</h1>
<p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
</div>
<ul>
<li>
Name:@devoptions.Name
</li>
<li>
Email:@devoptions.Email
</li>
<li>
WebSite:@devoptions.WebSite
</li>
</ul>
