fix #12516 by cleaning up Hosting error page (#12545)

* fix #12516 by cleaning up error page

* add a Diagnostics.slnf because I was there

* missed the IIS update

* update WebHost's error page

* Fix slnf path

src/Hosting/Hosting/src/GenericHost/GenericWebHostedService.cs

@@ -167,6 +167,7 @@ namespace Microsoft.AspNetCore.Hosting
                 .InformationalVersion;
             model.ClrVersion = clrVersion;
             model.OperatingSystemDescription = RuntimeInformation.OSDescription;
+            model.ShowRuntimeDetails = showDetailedErrors;
 
             if (showDetailedErrors)
             {

src/Hosting/Hosting/src/Internal/WebHost.cs

@@ -264,6 +264,7 @@ namespace Microsoft.AspNetCore.Hosting
                     .InformationalVersion;
                 model.ClrVersion = clrVersion;
                 model.OperatingSystemDescription = RuntimeInformation.OSDescription;
+                model.ShowRuntimeDetails = showDetailedErrors;
 
                 if (showDetailedErrors)
                 {

src/Middleware/Diagnostics/Diagnostics.slnf

@@ -0,0 +1,45 @@
+{
+  "solution": {
+    "path": "..\\Middleware.sln",
+    "projects": [
+      "..\\Hosting\\Abstractions\\src\\Microsoft.AspNetCore.Hosting.Abstractions.csproj",
+      "..\\Hosting\\Hosting\\src\\Microsoft.AspNetCore.Hosting.csproj",
+      "..\\Hosting\\Server.Abstractions\\src\\Microsoft.AspNetCore.Hosting.Server.Abstractions.csproj",
+      "..\\Hosting\\TestHost\\src\\Microsoft.AspNetCore.TestHost.csproj",
+      "..\\Http\\Authentication.Abstractions\\src\\Microsoft.AspNetCore.Authentication.Abstractions.csproj",
+      "..\\Http\\Authentication.Core\\src\\Microsoft.AspNetCore.Authentication.Core.csproj",
+      "..\\Http\\Http.Abstractions\\src\\Microsoft.AspNetCore.Http.Abstractions.csproj",
+      "..\\Http\\Http.Extensions\\src\\Microsoft.AspNetCore.Http.Extensions.csproj",
+      "..\\Http\\Http.Features\\src\\Microsoft.AspNetCore.Http.Features.csproj",
+      "..\\Http\\Metadata\\src\\Microsoft.AspNetCore.Metadata.csproj",
+      "..\\Http\\Routing.Abstractions\\src\\Microsoft.AspNetCore.Routing.Abstractions.csproj",
+      "..\\Http\\WebUtilities\\src\\Microsoft.AspNetCore.WebUtilities.csproj",
+      "..\\Security\\Authorization\\Core\\src\\Microsoft.AspNetCore.Authorization.csproj",
+      "..\\Servers\\Connections.Abstractions\\src\\Microsoft.AspNetCore.Connections.Abstractions.csproj",
+      "..\\Servers\\IIS\\IISIntegration\\src\\Microsoft.AspNetCore.Server.IISIntegration.csproj",
+      "..\\Servers\\Kestrel\\Core\\src\\Microsoft.AspNetCore.Server.Kestrel.Core.csproj",
+      "..\\Servers\\Kestrel\\Kestrel\\src\\Microsoft.AspNetCore.Server.Kestrel.csproj",
+      "..\\Servers\\Kestrel\\Transport.Sockets\\src\\Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets.csproj",
+      "..\\http\\Headers\\src\\Microsoft.Net.Http.Headers.csproj",
+      "..\\http\\Routing\\src\\Microsoft.AspNetCore.Routing.csproj",
+      "..\\http\\http\\src\\Microsoft.AspNetCore.Http.csproj",
+      "Diagnostics.Abstractions\\src\\Microsoft.AspNetCore.Diagnostics.Abstractions.csproj",
+      "Diagnostics.EntityFrameworkCore\\src\\Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.csproj",
+      "Diagnostics.EntityFrameworkCore\\test\\FunctionalTests\\Diagnostics.EFCore.FunctionalTests.csproj",
+      "Diagnostics.EntityFrameworkCore\\test\\UnitTests\\Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore.Tests.csproj",
+      "Diagnostics\\src\\Microsoft.AspNetCore.Diagnostics.csproj",
+      "Diagnostics\\test\\FunctionalTests\\Diagnostics.FunctionalTests.csproj",
+      "Diagnostics\\test\\UnitTests\\Microsoft.AspNetCore.Diagnostics.Tests.csproj",
+      "Diagnostics\\test\\testassets\\ClassLibraryWithPortablePdbs\\ClassLibraryWithPortablePdbs.csproj",
+      "Diagnostics\\test\\testassets\\DatabaseErrorPageSample\\DatabaseErrorPageSample.csproj",
+      "Diagnostics\\test\\testassets\\DeveloperExceptionPageSample\\DeveloperExceptionPageSample.csproj",
+      "Diagnostics\\test\\testassets\\ExceptionHandlerSample\\ExceptionHandlerSample.csproj",
+      "Diagnostics\\test\\testassets\\StatusCodePagesSample\\StatusCodePagesSample.csproj",
+      "Diagnostics\\test\\testassets\\WelcomePageSample\\WelcomePageSample.csproj",
+      "HttpOverrides\\src\\Microsoft.AspNetCore.HttpOverrides.csproj",
+      "MiddlewareAnalysis\\samples\\MiddlewareAnalysisSample\\MiddlewareAnalysisSample.csproj",
+      "MiddlewareAnalysis\\src\\Microsoft.AspNetCore.MiddlewareAnalysis.csproj",
+      "StaticFiles\\src\\Microsoft.AspNetCore.StaticFiles.csproj"
+    ]
+  }
+}

src/Servers/IIS/IIS/src/StartupHook.cs

@@ -83,7 +83,10 @@ internal class StartupHook
                 new PhysicalFileProvider(contentRoot),
                 sourceCodeLineCount: 6);
 
+            // The startup hook is only present when detailed errors are allowed, so
+            // we can turn on all the details.
             model.ErrorDetails = exceptionDetailProvider.GetDetails(exception);
+            model.ShowRuntimeDetails = true;
 
             var errorPage = new ErrorPage(model);
 

src/Shared/ErrorPage/ErrorPageModel.cs

@@ -16,6 +16,8 @@ namespace Microsoft.AspNetCore.Hosting.Views
         /// </summary>
         public IEnumerable<ExceptionDetails> ErrorDetails { get; set; }
 
+        public bool ShowRuntimeDetails { get; set; }
+
         public string RuntimeDisplayName { get; set; }
 
         public string RuntimeArchitecture { get; set; }

src/Shared/ErrorPage/GeneratePage.ps1

@@ -0,0 +1,18 @@
+param(
+    [Parameter(Mandatory = $true)][string]$ToolingRepoPath
+)
+
+$ToolPath = Join-Path $ToolingRepoPath "artifacts\bin\RazorPageGenerator\Debug\netcoreapp3.0\dotnet-razorpagegenerator.exe"
+
+if (!(Test-Path $ToolPath)) {
+    throw "Unable to find razor page generator tool at $ToolPath"
+}
+
+& "$ToolPath" Microsoft.AspNetCore.Hosting.Views $PSScriptRoot
+
+$TargetPath = Join-Path $PSScriptRoot "ErrorPage.Designer.cs"
+if (Test-Path $TargetPath) {
+    Remove-Item $TargetPath
+}
+
+Move-Item "$PSScriptRoot\Views\ErrorPage.Designer.cs" $PSScriptRoot

src/Shared/ErrorPage/README.md

@@ -0,0 +1,14 @@
+# Error Page
+
+This folder is shared among multiple projects. The `ErrorPage.Designer.cs` and `ErrorPageModel.cs` files are used to render this view. The `ErrorPage.Designer.cs` file is generated by rendering `src/Views/ErrorPage.cshtml` using the [RazorPageGenerator](https://github.com/aspnet/AspNetCore-Tooling/tree/master/src/Razor/src/RazorPageGenerator) tool.
+
+## Making changes to ErrorPage.cshtml
+
+1. Clone aspnet/AspNetCore-Tooling
+1. Run `./build.cmd` in **that repo**
+1. Edit the file
+1. Run the `GeneratePage` script, passing in the path to the `aspnet/AspNetCore-Tooling` repo root.
+
+```
+.\GeneratePage -ToolingRepoPath C:\Code\aspnet\AspNetCore-Tooling
+```

src/Shared/ErrorPage/Views/ErrorPage.cshtml

@@ -31,12 +31,11 @@
         @foreach (var errorDetail in Model.ErrorDetails)
         {
             <div class="titleerror">@errorDetail.Error.GetType().Name: @{ Output.Write(HtmlEncodeAndReplaceLineBreaks(errorDetail.Error.Message)); }</div>
-            @{
+
-                var firstFrame = errorDetail.StackFrames.FirstOrDefault();
+            var firstFrame = errorDetail.StackFrames.FirstOrDefault();
-                if (firstFrame != null)
+            if (firstFrame != null)
-                {
+            {
-                    location = firstFrame.Function;
+                location = firstFrame.Function;
-                }
             }
             if (!string.IsNullOrEmpty(location) && firstFrame != null && !string.IsNullOrEmpty(firstFrame.File))
             {
@@ -76,19 +75,15 @@
                 }
                 @foreach (var errorDetail in Model.ErrorDetails)
                 {
-                    @{
+                    exceptionCount++;
-                        exceptionCount++;
+                    exceptionDetailId = "exceptionDetail" + exceptionCount;
-                        exceptionDetailId = "exceptionDetail" + exceptionCount;
-                    }
                     <li>
                         <h2 class="stackerror">@errorDetail.Error.GetType().Name: @errorDetail.Error.Message</h2>
                         <ul>
                         @foreach (var frame in errorDetail.StackFrames)
                         {
-                            @{
+                            stackFrameCount++;
-                                stackFrameCount++;
+                            frameId = "frame" + stackFrameCount;
-                                frameId = "frame" + stackFrameCount;
-                            }
                             <li class="frame" id="@frameId">
                                 @if (string.IsNullOrEmpty(frame.File))
                                 {
@@ -149,9 +144,11 @@
                 }
             </ul>
         </div>
-        <footer>
+        @if (Model.ShowRuntimeDetails) {
-            @Model.RuntimeDisplayName @Model.RuntimeArchitecture v@(Model.ClrVersion) &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;Microsoft.AspNetCore.Hosting version @Model.CurrentAssemblyVesion &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp; @Model.OperatingSystemDescription &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;<a href="http://go.microsoft.com/fwlink/?LinkId=517394">Need help?</a>
+            <footer>
-        </footer>
+                @Model.RuntimeDisplayName @Model.RuntimeArchitecture v@(Model.ClrVersion) &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;Microsoft.AspNetCore.Hosting version @Model.CurrentAssemblyVesion &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp; @Model.OperatingSystemDescription &nbsp;&nbsp;&nbsp;|&nbsp;&nbsp;&nbsp;<a href="http://go.microsoft.com/fwlink/?LinkId=517394">Need help?</a>
+            </footer>
+        }
         <script>
             //<!--
             <%$ include: ErrorPage.js %>