Add Error razor page to Spa templates (#464)

Addresses #332

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/Angular-CSharp/Pages/Error.cshtml

@@ -0,0 +1,23 @@
+@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 <strong>Development</strong> environment will display more detailed information about the error that occurred.
+</p>
+<p>
+    <strong>Development environment should not be enabled in deployed applications</strong>, as it can result in sensitive information from exceptions being displayed to end users. For local debugging, development environment can be enabled by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>, and restarting the application.
+</p>

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/Angular-CSharp/Pages/Error.cshtml.cs

@@ -0,0 +1,23 @@
+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;
+
+namespace Company.WebApplication1.Pages
+{
+    public class ErrorModel : PageModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public void OnGet()
+        {
+            RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+        }
+    }
+}

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/Angular-CSharp/Pages/_ViewImports.cshtml

@@ -0,0 +1,3 @@
+@using Company.WebApplication1
+@namespace Company.WebApplication1.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/Angular-CSharp/Startup.cs

@@ -40,7 +40,7 @@ namespace Company.WebApplication1
             }
             else
             {
-                app.UseExceptionHandler("/Home/Error");
+                app.UseExceptionHandler("/Error");
 #if (!NoHttps)
                 app.UseHsts();
             }

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/React-CSharp/Pages/Error.cshtml

@@ -0,0 +1,23 @@
+@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 <strong>Development</strong> environment will display more detailed information about the error that occurred.
+</p>
+<p>
+    <strong>Development environment should not be enabled in deployed applications</strong>, as it can result in sensitive information from exceptions being displayed to end users. For local debugging, development environment can be enabled by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>, and restarting the application.
+</p>

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/React-CSharp/Pages/Error.cshtml.cs

@@ -0,0 +1,23 @@
+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;
+
+namespace Company.WebApplication1.Pages
+{
+    public class ErrorModel : PageModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public void OnGet()
+        {
+            RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+        }
+    }
+}

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/React-CSharp/Pages/_ViewImports.cshtml

@@ -0,0 +1,3 @@
+@using Company.WebApplication1
+@namespace Company.WebApplication1.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/React-CSharp/Startup.cs

@@ -40,7 +40,7 @@ namespace Company.WebApplication1
             }
             else
             {
-                app.UseExceptionHandler("/Home/Error");
+                app.UseExceptionHandler("/Error");
 #if (!NoHttps)
                 app.UseHsts();
             }

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/ReactRedux-CSharp/Pages/Error.cshtml

@@ -0,0 +1,23 @@
+@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 <strong>Development</strong> environment will display more detailed information about the error that occurred.
+</p>
+<p>
+    <strong>Development environment should not be enabled in deployed applications</strong>, as it can result in sensitive information from exceptions being displayed to end users. For local debugging, development environment can be enabled by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>, and restarting the application.
+</p>

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/ReactRedux-CSharp/Pages/Error.cshtml.cs

@@ -0,0 +1,23 @@
+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;
+
+namespace Company.WebApplication1.Pages
+{
+    public class ErrorModel : PageModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public void OnGet()
+        {
+            RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+        }
+    }
+}

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/ReactRedux-CSharp/Pages/_ViewImports.cshtml

@@ -0,0 +1,3 @@
+@using Company.WebApplication1
+@namespace Company.WebApplication1.Pages
+@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

src/Microsoft.DotNet.Web.Spa.ProjectTemplates/content/ReactRedux-CSharp/Startup.cs

@@ -40,7 +40,7 @@ namespace Company.WebApplication1
             }
             else
             {
-                app.UseExceptionHandler("/Home/Error");
+                app.UseExceptionHandler("/Error");
 #if (!NoHttps)
                 app.UseHsts();
             }