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* Startup * release wiki only when release is created
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| name: 'Publish Wiki' | ||
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| on: | ||
| push: | ||
| release: | ||
| types: [published, created, edited] | ||
| branches: | ||
| - master | ||
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demo/LazyAreas/AssemblyWithStartup/AssemblyWithStartup.csproj
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| <Project Sdk="Microsoft.NET.Sdk.Razor"> | ||
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| <PropertyGroup> | ||
| <TargetFramework>netstandard2.1</TargetFramework> | ||
| <RazorLangVersion>3.0</RazorLangVersion> | ||
| </PropertyGroup> | ||
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components" Version="3.0.0" /> | ||
| <PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="3.0.0" /> | ||
| </ItemGroup> | ||
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| </Project> |
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demo/LazyAreas/AssemblyWithStartup/Pages/AssemblyWithStartup.razor
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| @page "/startup" | ||
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| <h1>Assembly with Startup</h1> | ||
| <p> | ||
| This page is contained in <code>AssemblyWithStartup.dll</code>.<br /> | ||
| This Assembly contains a Startup class that shows an <code>alert()</code> when it gets loaded. | ||
| </p> | ||
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| using System; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.JSInterop; | ||
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| namespace AssemblyWithStartup | ||
| { | ||
| public class Startup | ||
| { | ||
| private readonly IJSRuntime _jsRuntime; | ||
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| public Startup(IJSRuntime jsRuntime) | ||
| { | ||
| _jsRuntime = jsRuntime; | ||
| } | ||
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| public Task Configure() | ||
| { | ||
| return Alert("Hello from Startup! The assembly 'AssemblyWithStartup' has been loaded ;)"); | ||
| } | ||
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| private async Task Alert(string message) | ||
| { | ||
| // avoid crash on prerendering | ||
| try | ||
| { | ||
| await _jsRuntime.InvokeVoidAsync("alert", message).ConfigureAwait(false); | ||
| } | ||
| catch (Exception) | ||
| { } | ||
| } | ||
| } | ||
| } |
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| @using Microsoft.AspNetCore.Components.Web |
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| There are some cases where you require to run some actions right after a lazy **Assembly** or **Module** is loaded. This section covers the **Startup** class and how to use it. | ||
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| # Creating a Startup (optional) | ||
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| In order to create a valid **Startup** for your Assembly, it just needs to include a *public class* called `Startup` with a *public* `Configure()` method: | ||
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| ```cs | ||
| public class Startup | ||
| { | ||
| // (optional) DI constructor | ||
| // public Startup(...) { } | ||
| // (alternative) public void Configure() | ||
| public Task Configure() | ||
| { | ||
| Console.WriteLine("Startup Called!"); | ||
| return Task.Delay(2000); | ||
| } | ||
| } | ||
| ``` | ||
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| As you might probably noticed, the `Startup` **constructor** accept parameters **injected** from the current `IServiceProvider`. | ||
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| That's all! The next time the assembly gets loaded it will find, construct and `await` your `Startup.Configure()` implementation. |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,37 @@ | ||
| using System; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.Extensions.DependencyInjection; | ||
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| namespace BlazorLazyLoading.Services | ||
| { | ||
| public static class AssemblyInitializer | ||
| { | ||
| public static Task ConfigureAssembly(Assembly assembly, IServiceProvider services) | ||
| { | ||
| var startupTypes = assembly.GetTypes() | ||
| .Where(t => t.Name == "Startup") | ||
| .Where(t => t.GetMethod("Configure", Array.Empty<Type>()) != null) | ||
| .ToList(); | ||
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| if (startupTypes.Count != 1) | ||
| { | ||
| return Task.CompletedTask; | ||
| } | ||
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| var startupType = startupTypes.First(); | ||
| var configureMethod = startupType.GetMethod("Configure", Array.Empty<Type>()); | ||
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| var startup = ActivatorUtilities.CreateInstance(services, startupType); | ||
| object result = configureMethod.Invoke(startup, Array.Empty<object>()); | ||
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| if (result is Task resultTask) | ||
| { | ||
| return resultTask; | ||
| } | ||
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| return Task.CompletedTask; | ||
| } | ||
| } | ||
| } |
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