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c#asp.net-coreblazor-webassembly
Riley Christian
Riley Christian

Reputation: 225

Display version, build date and environment of Blazor webassembly application

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.

Upvotes: 1

Views: 2315

Answers (1)

Chen
Chen

Reputation: 5164

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

Update:

Version:

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

Build Date:

You can add the AssemblyTitle (or any other attribute you like) to your csproj file:

<PropertyGroup>
    <AssemblyTitle>$([System.DateTime]::Now)</AssemblyTitle>
</PropertyGroup>

If you want to format the date, you can do like this:

<AssemblyTitle>$([System.DateTime]::Now.ToString(yyyyMMdd-HHmm))</AssemblyTitle>

Then in your Blazor code:

string BuildInfo;
protected override void OnInitialized()
{
    Assembly curAssembly = typeof(Program).Assembly;
    BuildInfo = $"{curAssembly.GetCustomAttributes(false).OfType<AssemblyTitleAttribute>().FirstOrDefault().Title}";
}

Upvotes: 5

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