Added error page for the basic theme.

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Pages/Error/Index.cshtml

@@ -0,0 +1,39 @@
+@page
+@using Localization.Resources.AbpUi
+@using Microsoft.AspNetCore.Mvc.Localization
+@using Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Pages.Error
+@model IndexModel
+@inject IHtmlLocalizer<AbpUiResource> L
+@{
+    var errorMessage = Model.ErrorInfo.Message;
+    var errorDetails = Model.ErrorInfo.Details;
+    if (errorDetails.IsNullOrEmpty())
+    {
+        errorDetails = errorMessage;
+        errorMessage = L["Error"].Value;
+    }
+}
+
+<h1>
+    [@Model.HttpStatusCode] @errorMessage
+</h1>
+
+<div>
+    <p>
+        @errorDetails
+    </p>
+    <p>
+        @if (!Model.ErrorInfo.ValidationErrors.IsNullOrEmpty())
+        {
+            foreach (var validationError in Model.ErrorInfo.ValidationErrors)
+            {
+                <text>* </text>@(validationError.Message)
+                if (validationError.Members != null && validationError.Members.Any())
+                {
+                    <text>(@string.Join(", ", validationError.Members))</text>
+                }
+                <br />
+            }
+        }
+    </p>
+</div>

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Pages/Error/Index.cshtml.cs

@@ -0,0 +1,40 @@
+using System;
+using Microsoft.AspNetCore.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Volo.Abp.AspNetCore.Mvc.ExceptionHandling;
+using Volo.Abp.Http;
+
+namespace Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.Pages.Error
+{
+    public class IndexModel : PageModel
+    {
+        public RemoteServiceErrorInfo ErrorInfo { get; set; }
+
+        [BindProperty(SupportsGet = true)]
+        public int HttpStatusCode { get; set; }
+
+        private readonly IExceptionToErrorInfoConverter _errorInfoConverter;
+
+        public IndexModel(IExceptionToErrorInfoConverter errorInfoConverter)
+        {
+            _errorInfoConverter = errorInfoConverter;
+        }
+
+        public void OnGet()
+        {
+            var exHandlerFeature = HttpContext.Features.Get<IExceptionHandlerFeature>();
+
+            var exception = exHandlerFeature != null
+                ? exHandlerFeature.Error
+                : new Exception("Unhandled exception!"); //TODO: Localize?
+
+            ErrorInfo = _errorInfoConverter.Convert(exception);
+
+            if (HttpStatusCode == 0)
+            {
+                HttpStatusCode = HttpContext.Response.StatusCode;
+            }
+        }
+    }
+}

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic/Volo.Abp.AspNetCore.Mvc.UI.Theme.Basic.csproj

@@ -19,6 +19,10 @@
     <EmbeddedResource Include="Views\**\*.cshtml" />
     <EmbeddedResource Include="wwwroot\**\*.*" />
   </ItemGroup>
+
+  <ItemGroup>
+    <Content Remove="Pages\Error\Index.cshtml" />
+  </ItemGroup>
   
   <ItemGroup>
     <None Remove="web.config" />

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared/AbpApplicationBuilderErrorPageExtensions.cs

@@ -0,0 +1,14 @@
+using Microsoft.AspNetCore.Builder;
+
+namespace Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared
+{
+    public static class AbpApplicationBuilderErrorPageExtensions
+    {
+        public static IApplicationBuilder UseErrorPage(this IApplicationBuilder app)
+        {
+            return app
+                .UseStatusCodePagesWithRedirects("~/Error?httpStatusCode={0}")
+                .UseExceptionHandler("/Error");
+        }
+    }
+}

src/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared/Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared.csproj

@@ -17,6 +17,10 @@
   <ItemGroup>
     <EmbeddedResource Include="wwwroot\**\*.*" />
   </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.Diagnostics" Version="2.0.2" />
+  </ItemGroup>
   
   <ItemGroup>
     <ProjectReference Include="..\Volo.Abp.AspNetCore.Mvc.UI.Bootstrap\Volo.Abp.AspNetCore.Mvc.UI.Bootstrap.csproj" />

src/Volo.Abp.AspNetCore.Mvc/Microsoft/AspNetCore/Builder/AbpAspNetCoreMvcApplicationBuilderExtensions.cs

@@ -12,7 +12,7 @@ namespace Microsoft.AspNetCore.Builder
                 .UseMiddleware<AbpUnitOfWorkMiddleware>();
         }
 
-        public static IApplicationBuilder UseAbpExceptionHandling(this IApplicationBuilder app) //TODO: Should this go to
+        public static IApplicationBuilder UseAbpExceptionHandling(this IApplicationBuilder app)
         {
             //Prevent multiple add
             if (app.Properties.ContainsKey("_AbpExceptionHandlingMiddleware_Added")) //TODO: Constant

src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/ExceptionHandling/AbpExceptionHandlingMiddleware.cs

@@ -44,7 +44,7 @@ namespace Volo.Abp.AspNetCore.Mvc.ExceptionHandling
 
                 if (httpContext.Items["_AbpActionInfo"] is AbpActionInfoInHttpContext actionInfo)
                 {
-                    if (actionInfo.IsObjectResult)
+                    if (actionInfo.IsObjectResult) //TODO: Align with AbpExceptionFilter.ShouldHandleException!
                     {
                         await HandleAndWrapException(httpContext, ex);
                         return;