Add Blazor WASM .NET on Web Workers sample app

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/App.razor

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+<Router AppAssembly="@typeof(App).Assembly" NotFoundPage="typeof(Pages.NotFound)">
+    <Found Context="routeData">
+        <RouteView RouteData="@routeData" DefaultLayout="@typeof(MainLayout)" />
+        <FocusOnNavigate RouteData="@routeData" Selector="h1" />
+    </Found>
+</Router>

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/BlazorWasm.csproj

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+<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">
+
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="10.0.0" />
+    <PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="10.0.0" PrivateAssets="all" />
+    <PackageReference Include="QRCoder" Version="1.7.0" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <SupportedPlatform Include="browser" />
+  </ItemGroup>
+</Project>

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/BlazorWasm.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 18
+VisualStudioVersion = 18.3.11218.70 d18.3
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlazorWasm", "BlazorWasm.csproj", "{C130AD78-5381-25F8-31BC-8D6ABC8C689E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{C130AD78-5381-25F8-31BC-8D6ABC8C689E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{C130AD78-5381-25F8-31BC-8D6ABC8C689E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{C130AD78-5381-25F8-31BC-8D6ABC8C689E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{C130AD78-5381-25F8-31BC-8D6ABC8C689E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {30A17113-5A5F-430E-BF98-304E5F74DFBE}
+	EndGlobalSection
+EndGlobal

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Clients/Client.razor

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+// dummy file to let blazor handle Client.razor.js file loading

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Clients/Client.razor.cs

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Runtime.InteropServices.JavaScript;
+using System.Runtime.Versioning;
+
+[SupportedOSPlatform("browser")]
+public partial class Client
+{
+    private static bool workerDotnetStarted;
+
+    public static async Task InitClient()
+    {
+        if (workerDotnetStarted)
+        {
+            return;
+        }
+
+        workerDotnetStarted = true;
+
+        await JSHost.ImportAsync(
+            moduleName: nameof(Client),
+            moduleUrl: $"../Clients/Client.razor.js");
+    }
+
+    [JSImport("generateQR", nameof(Client))]
+    public static partial Task<string> GenerateQR(string text, int size);
+}

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Clients/Client.razor.js

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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+const pendingRequests = {};
+let pendingRequestId = 0;
+
+const dotnetWorker = new Worker('./Workers/QRGenerator.razor.js', { type: "module" });
+dotnetWorker.addEventListener('message', async function (e) {
+    switch (e.data.command) {
+        case "response":
+            if (!e.data.requestId) {
+                console.error("No requestId in response from worker");
+            }
+            const request = pendingRequests[e.data.requestId];
+            delete pendingRequests[e.data.requestId];
+            if (e.data.error) {
+                request.reject(new Error(e.data.error));
+            }
+            request.resolve(e.data.result);
+            break;
+        default:
+            console.log('Worker said: ', e.data);
+            break;
+    }
+}, false);
+
+function sendRequestToWorker(request) {
+    pendingRequestId++;
+    const promise = new Promise((resolve, reject) => {
+        pendingRequests[pendingRequestId] = { resolve, reject };
+    });
+    dotnetWorker.postMessage({
+        ...request,
+        requestId: pendingRequestId
+    });
+    return promise;
+}
+
+export async function generateQR(text, size) {
+    const response = await sendRequestToWorker({
+        command: "generateQR",
+        text: text,
+        size: size
+    });
+    const blob = new Blob([response], { type: 'image/png' });
+    return URL.createObjectURL(blob);
+}

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Components/Popup.razor

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+@namespace Components
+
+@if (this.isVisible)
+{
+    <div class="modal d-block">
+        <div class="modal-dialog">
+            <div class="modal-content">
+                <div class="modal-header">
+                    <h5 class="modal-title">@title</h5>
+                    <button type="button" class="close" @onclick="@Hide" data-dismiss="modal" aria-label="Close">
+                        <span aria-hidden="true">×</span>
+                    </button>
+                </div>
+                <div class="modal-body">
+                    <p for="message">@message</p>
+                    <div class="text-center">
+                        <button class="btn btn-outline-danger" @onclick="@Hide">Close</button>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div> 
+}

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Components/Popup.razor.cs

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+using Microsoft.AspNetCore.Components;
+using System.Runtime.Versioning;
+
+namespace Components;
+
+[SupportedOSPlatform("browser")]
+public partial class Popup : ComponentBase
+{
+    private string message = string.Empty;
+    private string title = string.Empty;
+    private bool isVisible;
+
+    public void Show(string title, string message)
+    {
+        Console.WriteLine($"Popup.Show: {title} - {message}");
+        this.title = title;
+        this.message = message;
+        isVisible = true;
+        InvokeAsync(StateHasChanged);
+    }
+
+    public void Hide()
+    {
+        isVisible = false;
+        InvokeAsync(StateHasChanged);
+    }
+}

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Layout/MainLayout.razor

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+@namespace Layout
+@inherits LayoutComponentBase
+<div class="page">
+    <div class="sidebar">
+        <NavMenu />
+    </div>
+
+    <main>
+        <div class="top-row px-4">
+            <a href="https://learn.microsoft.com/aspnet/core/" target="_blank">About</a>
+        </div>
+
+        <article class="content px-4">
+            @Body
+        </article>
+    </main>
+</div>

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Layout/MainLayout.razor.css

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+.page {
+    position: relative;
+    display: flex;
+    flex-direction: column;
+}
+
+main {
+    flex: 1;
+}
+
+.sidebar {
+    background-image: linear-gradient(180deg, rgb(5, 39, 103) 0%, #3a0647 70%);
+}
+
+.top-row {
+    background-color: #f7f7f7;
+    border-bottom: 1px solid #d6d5d5;
+    justify-content: flex-end;
+    height: 3.5rem;
+    display: flex;
+    align-items: center;
+}
+
+    .top-row ::deep a, .top-row ::deep .btn-link {
+        white-space: nowrap;
+        margin-left: 1.5rem;
+        text-decoration: none;
+    }
+
+    .top-row ::deep a:hover, .top-row ::deep .btn-link:hover {
+        text-decoration: underline;
+    }
+
+    .top-row ::deep a:first-child {
+        overflow: hidden;
+        text-overflow: ellipsis;
+    }
+
+@media (max-width: 640.98px) {
+    .top-row {
+        justify-content: space-between;
+    }
+
+    .top-row ::deep a, .top-row ::deep .btn-link {
+        margin-left: 0;
+    }
+}
+
+@media (min-width: 641px) {
+    .page {
+        flex-direction: row;
+    }
+
+    .sidebar {
+        width: 250px;
+        height: 100vh;
+        position: sticky;
+        top: 0;
+    }
+
+    .top-row {
+        position: sticky;
+        top: 0;
+        z-index: 1;
+    }
+
+    .top-row.auth ::deep a:first-child {
+        flex: 1;
+        text-align: right;
+        width: 0;
+    }
+
+    .top-row, article {
+        padding-left: 2rem !important;
+        padding-right: 1.5rem !important;
+    }
+}

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Layout/NavMenu.razor

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+@namespace Layout
+
+<div class="top-row ps-3 navbar navbar-dark">
+    <div class="container-fluid">
+        <a class="navbar-brand" href="">BlazorWasm</a>
+        <button title="Navigation menu" class="navbar-toggler" @onclick="ToggleNavMenu">
+            <span class="navbar-toggler-icon"></span>
+        </button>
+    </div>
+</div>
+
+<div class="@NavMenuCssClass nav-scrollable" @onclick="ToggleNavMenu">
+    <nav class="flex-column">
+        <div class="nav-item px-3">
+            <NavLink class="nav-link" href="" Match="NavLinkMatch.All">
+                <span class="bi bi-house-door-fill-nav-menu" aria-hidden="true"></span> Home
+            </NavLink>
+        </div>
+    </nav>
+</div>
+
+@code {
+    private bool collapseNavMenu = true;
+
+    private string? NavMenuCssClass => collapseNavMenu ? "collapse" : null;
+
+    private void ToggleNavMenu()
+    {
+        collapseNavMenu = !collapseNavMenu;
+    }
+}

10.0/DotNetOnWebWorkersBlazorWebAssembly/BlazorWasm/Layout/NavMenu.razor.css

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+.navbar-toggler {
+    background-color: rgba(255, 255, 255, 0.1);
+}
+
+.top-row {
+    height: 3.5rem;
+    background-color: rgba(0,0,0,0.4);
+}
+
+.navbar-brand {
+    font-size: 1.1rem;
+}
+
+.bi {
+    display: inline-block;
+    position: relative;
+    width: 1.25rem;
+    height: 1.25rem;
+    margin-right: 0.75rem;
+    top: -1px;
+    background-size: cover;
+}
+
+.bi-house-door-fill-nav-menu {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-house-door-fill' viewBox='0 0 16 16'%3E%3Cpath d='M6.5 14.5v-3.505c0-.245.25-.495.5-.495h2c.25 0 .5.25.5.5v3.5a.5.5 0 0 0 .5.5h4a.5.5 0 0 0 .5-.5v-7a.5.5 0 0 0-.146-.354L13 5.793V2.5a.5.5 0 0 0-.5-.5h-1a.5.5 0 0 0-.5.5v1.293L8.354 1.146a.5.5 0 0 0-.708 0l-6 6A.5.5 0 0 0 1.5 7.5v7a.5.5 0 0 0 .5.5h4a.5.5 0 0 0 .5-.5Z'/%3E%3C/svg%3E");
+}
+
+.bi-plus-square-fill-nav-menu {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-plus-square-fill' viewBox='0 0 16 16'%3E%3Cpath d='M2 0a2 2 0 0 0-2 2v12a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V2a2 2 0 0 0-2-2H2zm6.5 4.5v3h3a.5.5 0 0 1 0 1h-3v3a.5.5 0 0 1-1 0v-3h-3a.5.5 0 0 1 0-1h3v-3a.5.5 0 0 1 1 0z'/%3E%3C/svg%3E");
+}
+
+.bi-list-nested-nav-menu {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='white' class='bi bi-list-nested' viewBox='0 0 16 16'%3E%3Cpath fill-rule='evenodd' d='M4.5 11.5A.5.5 0 0 1 5 11h10a.5.5 0 0 1 0 1H5a.5.5 0 0 1-.5-.5zm-2-4A.5.5 0 0 1 3 7h10a.5.5 0 0 1 0 1H3a.5.5 0 0 1-.5-.5zm-2-4A.5.5 0 0 1 1 3h10a.5.5 0 0 1 0 1H1a.5.5 0 0 1-.5-.5z'/%3E%3C/svg%3E");
+}
+
+.nav-item {
+    font-size: 0.9rem;
+    padding-bottom: 0.5rem;
+}
+
+    .nav-item:first-of-type {
+        padding-top: 1rem;
+    }
+
+    .nav-item:last-of-type {
+        padding-bottom: 1rem;
+    }
+
+    .nav-item ::deep a {
+        color: #d7d7d7;
+        border-radius: 4px;
+        height: 3rem;
+        display: flex;
+        align-items: center;
+        line-height: 3rem;
+    }
+
+.nav-item ::deep a.active {
+    background-color: rgba(255,255,255,0.37);
+    color: white;
+}
+
+.nav-item ::deep a:hover {
+    background-color: rgba(255,255,255,0.1);
+    color: white;
+}
+
+@media (min-width: 641px) {
+    .navbar-toggler {
+        display: none;
+    }
+
+    .collapse {
+        /* Never collapse the sidebar for wide screens */
+        display: block;
+    }
+
+    .nav-scrollable {
+        /* Allow sidebar to scroll for tall menus */
+        height: calc(100vh - 3.5rem);
+        overflow-y: auto;
+    }
+}