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question:I'm currently working on a .NET Standard 2.1 Blazor WebAssembly application. I'm trying to include or exclude Stylesheets according to an environment variable. In .NET Core, there are usually Environment Tag Helpers like in the following example: ```razor <environment include=Development> <link rel=stylesheet href=css/style.css type=text/css /> </environment> <environment exclude=Development> <link rel=stylesheet href=css/style.min.css type=text/css /> </environment> ``` This works perfectly fine in a Blazor Server application, but doesn't work in Blazor WebAssembly, as this is client-side code. I'm trying to find a good solution to include/exclude Style sheets according to the Environment variable in Blazor WebAssembly. My current approach is to call a JavaScript helper method from my Blazor WebAssembly `Program.cs` file with JSInterop and remove the Stylesheets according to the environment variable: ```csharp await jsInterop.InvokeVoidAsync(helpers.setup, Development); ``` My JavaScript on the client looks like this: ```javascript window.helpers = { setup: (environment) => { if (environment === Development) { // remove production styles } if (environment !== Development) { // remove development styles } } }; ``` The problem with this solution is that I want to put my styles into my header file and group them into a `<section>` element or something similar, which doesn't work in valid HTML5. How do you handle your Development/Production environment in Blazor WebAssembly? How can you exclude or include specific CSS files according to the set environment variable in the project settings (`launchsettings.json`)?
answer:One approach you can try is to create a `Head` component in Blazor WebAssembly and use it to include or exclude specific CSS files based on the environment variable. First, create a new Blazor component called `Head.razor` with the following content: ```razor @using Microsoft.AspNetCore.Components.WebAssembly.Hosting @inject IWebAssemblyHostEnvironment hostEnv <meta charset=utf-8 /> <meta name=viewport content=width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no /> <base href=/ /> <link href=css/bootstrap/bootstrap.min.css rel=stylesheet /> <link href=css/app.css rel=stylesheet /> @if (hostEnv.IsDevelopment()) { <title>BlazorWasmApp - In Debug</title> <link href=css/debug.css rel=stylesheet /> } else { <title>BlazorWasmApp - Not Debug</title> <link href=css/live.css rel=stylesheet /> } @code {} ``` In this component, we inject the `IWebAssemblyHostEnvironment` service to access the environment variable. We then conditionally include the CSS files based on the environment using the `hostEnv.IsDevelopment()` method. Next, in your `Program.cs` file, register the `Head` component as a root component: ```csharp public static async Task Main(string[] args) { var builder = WebAssemblyHostBuilder.CreateDefault(args); builder.RootComponents.Add<App>(app); // Add the Head component to root components builder.RootComponents.Add<Head>(head); builder.Services.AddTransient(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) }); await builder.Build().RunAsync(); } ``` By adding the `Head` component to the root components, it will be included in the HTML output and its content will be rendered in the `<head>` section of the page. Make sure to have the CSS files (`debug.css` and `live.css`) in the `wwwroot/css` directory. Finally, in your `launchsettings.json` file, set the `ASPNETCORE_ENVIRONMENT` environment variable to Development or Production for the respective profiles. Now, when you run the application with the Development profile, the `debug.css` file will be included in the `<head>` section, and when you run it with the Production profile, the `live.css` file will be included instead. This approach allows you to handle the Development/Production environment in Blazor WebAssembly and include or exclude specific CSS files based on the environment variable.
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