Dependency injection configurations into views in asp.net core

本文展示如何在ASP.NET Core MVC Application Razor视图中注入和使用应用程序的配置信息。

将配置信息添加到appsettings.json中：

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AppOptions": {
    "Host": "http://oneasp.net"
  }
}

创建一个AppOptions类，用来读取配置信息：

public class AppOptions : IOptions<AppOptions>
{
    public string Host { get; set; }

    public AppOptions Value => this;
}

使用ASP.NET Core默认的DI组件注入配置信息：

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
    services.Configure<AppOptions>(Configuration.GetSection("AppOptions"));
}

在Razor视图中获取配置信息：

@{
    ViewData["Title"] = "Home Page";
}
@using Microsoft.Extensions.Options;
@inject IOptions<AppOptions> appOptions;

<h1>@appOptions.Value.Host</h1>