Add Environments sample apps

fundamentals/environments/3.0/EnvironmentsSample/.vscode/launch.json

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+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": ".NET Core Launch (web)",
+            "type": "coreclr",
+            // Configuration ommitted for brevity.
+            "request": "launch",
+            "preLaunchTask": "build",
+            "program": "${workspaceFolder}/bin/Debug/netcoreapp3.1/EnvironmentsSample.dll",
+            "args": [],
+            "cwd": "${workspaceFolder}",
+            "stopAtEntry": false,
+            "internalConsoleOptions": "openOnSessionStart",
+            "launchBrowser": {
+                "enabled": true,
+                "args": "${auto-detect-url}",
+                "windows": {
+                    "command": "cmd.exe",
+                    "args": "/C start ${auto-detect-url}"
+                },
+                "osx": {
+                    "command": "open"
+                },
+                "linux": {
+                    "command": "xdg-open"
+                }
+            },
+            "env": {
+                "ASPNETCORE_ENVIRONMENT": "Development",
+                "ASPNETCORE_URLS": "https://localhost:5001",
+                "ASPNETCORE_DETAILEDERRORS": "1",
+                "ASPNETCORE_SHUTDOWNTIMEOUTSECONDS": "3"
+            },
+            // Configuration ommitted for brevity.
+            "sourceFileMap": {
+                "/Views": "${workspaceFolder}/Views"
+            }
+        },
+        {
+            "name": ".NET Core Attach",
+            "type": "coreclr",
+            "request": "attach",
+            "processId": "${command:pickProcess}"
+        }
+    ]
+}

fundamentals/environments/3.0/EnvironmentsSample/EnvironmentsSample.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <Configurations>Debug;Release;IISxMultiConfig</Configurations>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='IISxMultiConfig|AnyCPU'">
+    <DefineConstants>TRACE;MULTI</DefineConstants>
+  </PropertyGroup>
+
+
+
+</Project>

fundamentals/environments/3.0/EnvironmentsSample/Pages/About.cshtml

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+@page
+@inject Microsoft.AspNetCore.Hosting.IWebHostEnvironment hostingEnv
+@model AboutModel
+@{
+    ViewData["Title"] = "About";
+}
+<h2>@ViewData["Title"]</h2>
+<h3>@Model.Message</h3>
+
+<p> ASPNETCORE_ENVIRONMENT = @hostingEnv.EnvironmentName</p>
+
+<!-- <snippet_Environment> -->
+<environment include="Development">
+    <div>The effective tag is: &lt;environment include="Development"&gt;</div>
+</environment>
+<environment exclude="Development">
+    <div>The effective tag is: &lt;environment exclude="Development"&gt;</div>
+</environment>
+<environment include="Staging,Development,Staging_2">
+    <div>
+        The effective tag is:
+        &lt;environment include="Staging,Development,Staging_2"&gt;
+    </div>
+</environment>
+<!-- </snippet_Environment> -->

fundamentals/environments/3.0/EnvironmentsSample/Pages/About.cshtml.cs

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+using Microsoft.AspNetCore.Mvc.RazorPages;
+using System;
+
+namespace EnvironmentsSample.Pages
+{
+    public class AboutModel : PageModel
+    {
+        public string Message { get; set; }
+
+        public void OnGet()
+        {
+            var env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");
+            Message = $"ASPNETCORE_ENVIRONMENT = {env}";
+        }
+    }
+}

fundamentals/environments/3.0/EnvironmentsSample/Pages/Error.cshtml

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+@page
+@model ErrorModel
+@{
+    ViewData["Title"] = "Error";
+}
+
+<h1 class="text-danger">Error.</h1>
+<h2 class="text-danger">An error occurred while processing your request.</h2>
+
+@if (Model.ShowRequestId)
+{
+    <p>
+        <strong>Request ID:</strong> <code>@Model.RequestId</code>
+    </p>
+}
+
+<h3>Development Mode</h3>
+<p>
+    Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
+</p>
+<p>
+    <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+    It can result in displaying sensitive information from exceptions to end users.
+    For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+    and restarting the app.
+</p>

fundamentals/environments/3.0/EnvironmentsSample/Pages/Error.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Logging;
+
+namespace EnvironmentsSample.Pages
+{
+    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+    public class ErrorModel : PageModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+        private readonly ILogger<ErrorModel> _logger;
+
+        public ErrorModel(ILogger<ErrorModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+            RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+        }
+    }
+}

fundamentals/environments/3.0/EnvironmentsSample/Pages/Index.cshtml

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+@page
+@model IndexModel
+@{
+    ViewData["Title"] = "Home page";
+}
+
+<div class="text-center">
+    <h1 class="display-4">Welcome</h1>
+    <p>Learn about <a href="https://docs.microsoft.com/aspnet/core">building Web apps with ASP.NET Core</a>.</p>
+</div>

fundamentals/environments/3.0/EnvironmentsSample/Pages/Index.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Logging;
+
+namespace EnvironmentsSample.Pages
+{
+    public class IndexModel : PageModel
+    {
+        private readonly ILogger<IndexModel> _logger;
+
+        public IndexModel(ILogger<IndexModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+
+        }
+    }
+}

fundamentals/environments/3.0/EnvironmentsSample/Pages/Privacy.cshtml

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+@page
+@model PrivacyModel
+@{
+    ViewData["Title"] = "Privacy Policy";
+}
+<h1>@ViewData["Title"]</h1>
+
+<p>Use this page to detail your site's privacy policy.</p>

fundamentals/environments/3.0/EnvironmentsSample/Pages/Privacy.cshtml.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Logging;
+
+namespace EnvironmentsSample.Pages
+{
+    public class PrivacyModel : PageModel
+    {
+        private readonly ILogger<PrivacyModel> _logger;
+
+        public PrivacyModel(ILogger<PrivacyModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+        }
+    }
+}

fundamentals/environments/3.0/EnvironmentsSample/Pages/Shared/_Layout.cshtml

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>@ViewData["Title"] - EnvironmentsSample</title>
+    <link rel="stylesheet" href="~/lib/bootstrap/dist/css/bootstrap.css" />
+    <link rel="stylesheet" href="~/css/site.css" />
+</head>
+<body>
+    <header>
+        <nav class="navbar navbar-expand-sm navbar-toggleable-sm navbar-light bg-white border-bottom box-shadow mb-3">
+            <div class="container">
+                <a class="navbar-brand" asp-area="" asp-page="/Index">EnvironmentsSample</a>
+                <button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".navbar-collapse" aria-controls="navbarSupportedContent"
+                        aria-expanded="false" aria-label="Toggle navigation">
+                    <span class="navbar-toggler-icon"></span>
+                </button>
+                <div class="navbar-collapse collapse d-sm-inline-flex flex-sm-row-reverse">
+                    <ul class="navbar-nav flex-grow-1">
+                        <li class="nav-item">
+                            <a class="nav-link text-dark" asp-area="" asp-page="/Index">Home</a>
+                        </li>
+                        <li class="nav-item">
+                            <a class="nav-link text-dark" asp-area="" asp-page="/About">About</a>
+                        </li>
+                        <li class="nav-item">
+                            <a class="nav-link text-dark" asp-area="" asp-page="/Privacy">Privacy</a>
+                        </li>
+                    </ul>
+                </div>
+            </div>
+        </nav>
+    </header>
+    <div class="container">
+        <main role="main" class="pb-3">
+            @RenderBody()
+        </main>
+    </div>
+
+    <footer class="border-top footer text-muted">
+        <div class="container">
+            &copy; 2020 - EnvironmentsSample - <a asp-area="" asp-page="/Privacy">Privacy</a>
+        </div>
+    </footer>
+
+    <script src="~/lib/jquery/dist/jquery.js"></script>
+    <script src="~/lib/bootstrap/dist/js/bootstrap.bundle.js"></script>
+    <script src="~/js/site.js" asp-append-version="true"></script>
+
+    @RenderSection("Scripts", required: false)
+</body>
+</html>

fundamentals/environments/3.0/EnvironmentsSample/Pages/Shared/_ValidationScriptsPartial.cshtml

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+<script src="~/lib/jquery-validation/dist/jquery.validate.js"></script>
+<script src="~/lib/jquery-validation-unobtrusive/jquery.validate.unobtrusive.js"></script>

fundamentals/environments/3.0/EnvironmentsSample/Pages/_ViewImports.cshtml

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+@using EnvironmentsSample
+@namespace EnvironmentsSample.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

fundamentals/environments/3.0/EnvironmentsSample/Pages/_ViewStart.cshtml

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+@{
+    Layout = "_Layout";
+}

fundamentals/environments/3.0/EnvironmentsSample/Program.cs

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+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Hosting;
+using System.Reflection;
+
+namespace EnvironmentsSample
+{
+#if MULTI
+    #region snippet
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args)
+        {
+            var assemblyName = typeof(Startup).GetTypeInfo().Assembly.FullName;
+
+            return   Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    webBuilder.UseStartup(assemblyName);
+                });
+        }
+    }
+    #endregion
+#else
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                   // webBuilder.UseStartup<First.Startup>();
+                   // webBuilder.UseStartup<Inject.Startup>();
+                    webBuilder.UseStartup<MethodConventions.Startup>();
+
+                });
+    }
+#endif
+}