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initialize new .NET Aspire project with basic structure and configuration
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‎16-aspire/16-aspire.ApiService/16-aspire.ApiService.csproj

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\16-aspire.ServiceDefaults\16-aspire.ServiceDefaults.csproj" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="9.0.2" />
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</ItemGroup>
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</Project>

‎16-aspire/16-aspire.ApiService/Program.cs

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var builder = WebApplication.CreateBuilder(args);
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// Add service defaults & Aspire client integrations.
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builder.AddServiceDefaults();
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// Add services to the container.
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builder.Services.AddProblemDetails();
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// Learn more about configuring OpenAPI at https://aka.ms/aspnet/openapi
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builder.Services.AddOpenApi();
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var app = builder.Build();
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// Configure the HTTP request pipeline.
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app.UseExceptionHandler();
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if (app.Environment.IsDevelopment())
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{
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app.MapOpenApi();
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}
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string[] summaries = ["Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"];
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app.MapGet("/weatherforecast", () =>
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{
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var forecast = Enumerable.Range(1, 5).Select(index =>
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new WeatherForecast
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(
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DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
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Random.Shared.Next(-20, 55),
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summaries[Random.Shared.Next(summaries.Length)]
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))
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.ToArray();
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return forecast;
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})
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.WithName("GetWeatherForecast");
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app.MapDefaultEndpoints();
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app.Run();
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record WeatherForecast(DateOnly Date, int TemperatureC, string? Summary)
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{
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public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
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}

‎16-aspire/16-aspire.ApiService/Properties/launchSettings.json

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{
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"$schema": "https://json.schemastore.org/launchsettings.json",
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"profiles": {
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"http": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": false,
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"applicationUrl": "http://localhost:5461",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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},
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"https": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": false,
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"applicationUrl": "https://localhost:7370;http://localhost:5461",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development"
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}
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}
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}
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}

‎16-aspire/16-aspire.ApiService/appsettings.Development.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.AspNetCore": "Warning"
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}
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}
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}

‎16-aspire/16-aspire.ApiService/appsettings.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.AspNetCore": "Warning"
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}
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},
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"AllowedHosts": "*"
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}

‎16-aspire/16-aspire.AppHost/16-aspire.AppHost.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<Sdk Name="Aspire.AppHost.Sdk" Version="9.1.0" />
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsAspireHost>true</IsAspireHost>
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<UserSecretsId>52caef68-e049-41e7-a21a-b02a0eef999d</UserSecretsId>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\16-aspire.ApiService\16-aspire.ApiService.csproj" />
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<ProjectReference Include="..\16-aspire.Web\16-aspire.Web.csproj" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Aspire.Hosting.AppHost" Version="9.1.0" />
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</ItemGroup>
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</Project>

‎16-aspire/16-aspire.AppHost/Program.cs

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var builder = DistributedApplication.CreateBuilder(args);
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var apiService = builder.AddProject<Projects._16_aspire_ApiService>("apiservice");
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builder.AddProject<Projects._16_aspire_Web>("webfrontend")
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.WithExternalHttpEndpoints()
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.WithReference(apiService)
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.WaitFor(apiService);
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builder.Build().Run();

‎16-aspire/16-aspire.AppHost/Properties/launchSettings.json

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{
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"$schema": "https://json.schemastore.org/launchsettings.json",
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"profiles": {
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"https": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "https://localhost:17245;http://localhost:15063",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development",
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"DOTNET_ENVIRONMENT": "Development",
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"DOTNET_DASHBOARD_OTLP_ENDPOINT_URL": "https://localhost:21050",
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"DOTNET_RESOURCE_SERVICE_ENDPOINT_URL": "https://localhost:22157"
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}
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},
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"http": {
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"commandName": "Project",
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"dotnetRunMessages": true,
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"launchBrowser": true,
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"applicationUrl": "http://localhost:15063",
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"environmentVariables": {
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"ASPNETCORE_ENVIRONMENT": "Development",
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"DOTNET_ENVIRONMENT": "Development",
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"DOTNET_DASHBOARD_OTLP_ENDPOINT_URL": "http://localhost:19276",
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"DOTNET_RESOURCE_SERVICE_ENDPOINT_URL": "http://localhost:20162"
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}
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}
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}
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}

‎16-aspire/16-aspire.AppHost/appsettings.Development.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.AspNetCore": "Warning"
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}
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}
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}

‎16-aspire/16-aspire.AppHost/appsettings.json

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{
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"Logging": {
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"LogLevel": {
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"Default": "Information",
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"Microsoft.AspNetCore": "Warning",
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"Aspire.Hosting.Dcp": "Warning"
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}
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}
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}

‎16-aspire/16-aspire.ServiceDefaults/16-aspire.ServiceDefaults.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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<IsAspireSharedProject>true</IsAspireSharedProject>
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</PropertyGroup>
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<ItemGroup>
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<FrameworkReference Include="Microsoft.AspNetCore.App" />
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<PackageReference Include="Microsoft.Extensions.Http.Resilience" Version="9.2.0" />
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<PackageReference Include="Microsoft.Extensions.ServiceDiscovery" Version="9.1.0" />
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<PackageReference Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.9.0" />
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<PackageReference Include="OpenTelemetry.Extensions.Hosting" Version="1.9.0" />
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<PackageReference Include="OpenTelemetry.Instrumentation.AspNetCore" Version="1.9.0" />
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<PackageReference Include="OpenTelemetry.Instrumentation.Http" Version="1.9.0" />
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<PackageReference Include="OpenTelemetry.Instrumentation.Runtime" Version="1.9.0" />
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</ItemGroup>
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</Project>

‎16-aspire/16-aspire.ServiceDefaults/Extensions.cs

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using Microsoft.AspNetCore.Builder;
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using Microsoft.AspNetCore.Diagnostics.HealthChecks;
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using Microsoft.Extensions.DependencyInjection;
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using Microsoft.Extensions.Diagnostics.HealthChecks;
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using Microsoft.Extensions.Logging;
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using Microsoft.Extensions.ServiceDiscovery;
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using OpenTelemetry;
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using OpenTelemetry.Metrics;
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using OpenTelemetry.Trace;
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namespace Microsoft.Extensions.Hosting;
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// Adds common .NET Aspire services: service discovery, resilience, health checks, and OpenTelemetry.
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// This project should be referenced by each service project in your solution.
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// To learn more about using this project, see https://aka.ms/dotnet/aspire/service-defaults
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public static class Extensions
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{
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public static TBuilder AddServiceDefaults<TBuilder>(this TBuilder builder) where TBuilder : IHostApplicationBuilder
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{
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builder.ConfigureOpenTelemetry();
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builder.AddDefaultHealthChecks();
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builder.Services.AddServiceDiscovery();
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builder.Services.ConfigureHttpClientDefaults(http =>
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{
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// Turn on resilience by default
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http.AddStandardResilienceHandler();
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// Turn on service discovery by default
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http.AddServiceDiscovery();
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});
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// Uncomment the following to restrict the allowed schemes for service discovery.
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// builder.Services.Configure<ServiceDiscoveryOptions>(options =>
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// {
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// options.AllowedSchemes = ["https"];
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// });
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return builder;
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}
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public static TBuilder ConfigureOpenTelemetry<TBuilder>(this TBuilder builder) where TBuilder : IHostApplicationBuilder
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{
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builder.Logging.AddOpenTelemetry(logging =>
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{
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logging.IncludeFormattedMessage = true;
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logging.IncludeScopes = true;
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});
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builder.Services.AddOpenTelemetry()
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.WithMetrics(metrics =>
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{
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metrics.AddAspNetCoreInstrumentation()
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.AddHttpClientInstrumentation()
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.AddRuntimeInstrumentation();
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})
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.WithTracing(tracing =>
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{
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tracing.AddSource(builder.Environment.ApplicationName)
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.AddAspNetCoreInstrumentation()
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// Uncomment the following line to enable gRPC instrumentation (requires the OpenTelemetry.Instrumentation.GrpcNetClient package)
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//.AddGrpcClientInstrumentation()
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.AddHttpClientInstrumentation();
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});
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builder.AddOpenTelemetryExporters();
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return builder;
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}
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private static TBuilder AddOpenTelemetryExporters<TBuilder>(this TBuilder builder) where TBuilder : IHostApplicationBuilder
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{
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var useOtlpExporter = !string.IsNullOrWhiteSpace(builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"]);
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if (useOtlpExporter)
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{
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builder.Services.AddOpenTelemetry().UseOtlpExporter();
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}
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// Uncomment the following lines to enable the Azure Monitor exporter (requires the Azure.Monitor.OpenTelemetry.AspNetCore package)
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//if (!string.IsNullOrEmpty(builder.Configuration["APPLICATIONINSIGHTS_CONNECTION_STRING"]))
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//{
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// builder.Services.AddOpenTelemetry()
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// .UseAzureMonitor();
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//}
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return builder;
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}
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public static TBuilder AddDefaultHealthChecks<TBuilder>(this TBuilder builder) where TBuilder : IHostApplicationBuilder
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{
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builder.Services.AddHealthChecks()
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// Add a default liveness check to ensure app is responsive
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.AddCheck("self", () => HealthCheckResult.Healthy(), ["live"]);
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return builder;
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}
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public static WebApplication MapDefaultEndpoints(this WebApplication app)
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{
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// Adding health checks endpoints to applications in non-development environments has security implications.
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// See https://aka.ms/dotnet/aspire/healthchecks for details before enabling these endpoints in non-development environments.
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if (app.Environment.IsDevelopment())
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{
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// All health checks must pass for app to be considered ready to accept traffic after starting
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app.MapHealthChecks("/health");
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// Only health checks tagged with the "live" tag must pass for app to be considered alive
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app.MapHealthChecks("/alive", new HealthCheckOptions
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{
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Predicate = r => r.Tags.Contains("live")
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});
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}
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return app;
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}
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}

‎16-aspire/16-aspire.Web/16-aspire.Web.csproj

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<Project Sdk="Microsoft.NET.Sdk.Web">
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<PropertyGroup>
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<TargetFramework>net9.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<ProjectReference Include="..\16-aspire.ServiceDefaults\16-aspire.ServiceDefaults.csproj" />
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</ItemGroup>
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</Project>

‎16-aspire/16-aspire.Web/Components/App.razor

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<base href="/" />
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<link rel="stylesheet" href="@Assets["lib/bootstrap/dist/css/bootstrap.min.css"]" />
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<link rel="stylesheet" href="@Assets["app.css"]" />
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<link rel="stylesheet" href="@Assets["16-aspire.Web.styles.css"]" />
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<ImportMap />
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<link rel="icon" type="image/png" href="favicon.png" />
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<HeadOutlet />
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</head>
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<body>
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<Routes />
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<script src="_framework/blazor.web.js"></script>
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</body>
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</html>

‎16-aspire/16-aspire.Web/Components/Layout/MainLayout.razor

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@inherits LayoutComponentBase
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<div class="page">
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<div class="sidebar">
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<NavMenu />
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</div>
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<main>
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<div class="top-row px-4">
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<a href="https://learn.microsoft.com/aspnet/core/" target="_blank">About</a>
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</div>
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<article class="content px-4">
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@Body
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</article>
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</main>
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</div>
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<div id="blazor-error-ui">
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An unhandled error has occurred.
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<a href="" class="reload">Reload</a>
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<a class="dismiss">🗙</a>
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</div>

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