显示 Blazor webassembly 应用程序的版本、构建日期和环境

Question

I am trying to display the version, build date and environment variable on the NavMenu of a Blazor Webassembly application. Here is what i have tried but in vain

NavMenu.razor.cs

protected static Version AppVersion => Assembly.GetExecutingAssembly().GetName().Version?? throw new NullReferenceException();

protected DateTime BuildDate => new DateTime(2000, 1, 1).AddDays(AppVersion.Build).AddSeconds(AppVersion.Revision * 2);

protected string DisplayEnvironment => Environment.GetEnvironmentVariable(EnvironmentVariableTarget.Process) ?? throw new NullReferenceException()

When i run the app i get null reference exception possibly on DisplayEnvironment property. I would appreciate any help.

Answer 1

According to this link , environment variables aren't available to Blazor WebAssembly.

You can obtain the app's environment in a component by injecting IWebAssemblyHostEnvironment and reading the Environment property.

@using Microsoft.AspNetCore.Components.WebAssembly.Hosting
@inject IWebAssemblyHostEnvironment HostEnvironment

<h1>Environment example</h1>

<p>Environment: @HostEnvironment.Environment</p>

Reference link: ASP.NET Core Blazor environments