Migrated SampleWebApp.Core to .NET Core 3.1 LTS.

SampleWebApp.Core/Controllers/HomeController.cs

@@ -14,11 +14,11 @@ namespace SampleWebApp.Core.Controllers
     public class HomeController : Controller
     {
         private const string XlsxContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
-        private readonly IHostingEnvironment _hostingEnvironment;
+        private readonly IWebHostEnvironment _webHostEnvironment;
 
-        public HomeController(IHostingEnvironment hostingEnvironment)
+        public HomeController(IWebHostEnvironment webHostEnvironment)
         {
-            _hostingEnvironment = hostingEnvironment;
+            _webHostEnvironment = webHostEnvironment;
         }
 
         /// <summary>
@@ -31,7 +31,7 @@ public IActionResult FileReport()
 
             using (var package = createExcelPackage())
             {
-                package.SaveAs(new FileInfo(Path.Combine(_hostingEnvironment.WebRootPath, reportsFolder, fileDownloadName)));
+                package.SaveAs(new FileInfo(Path.Combine(_webHostEnvironment.WebRootPath, reportsFolder, fileDownloadName)));
             }
             return File($"~/{reportsFolder}/{fileDownloadName}", XlsxContentType, fileDownloadName);
         }
@@ -62,7 +62,7 @@ public IActionResult ReadFile()
         {
             var fileDownloadName = "report.xlsx";
             var reportsFolder = "reports";
-            var fileInfo = new FileInfo(Path.Combine(_hostingEnvironment.WebRootPath, reportsFolder, fileDownloadName));
+            var fileInfo = new FileInfo(Path.Combine(_webHostEnvironment.WebRootPath, reportsFolder, fileDownloadName));
             if (!fileInfo.Exists)
             {
                 using (var package = createExcelPackage())
@@ -207,7 +207,7 @@ private ExcelPackage createExcelPackage()
             worksheet.Cells[1, 1, 4, 4].AutoFitColumns();
 
             worksheet.HeaderFooter.OddFooter.InsertPicture(
-                new FileInfo(Path.Combine(_hostingEnvironment.WebRootPath, "images", "captcha.jpg")),
+                new FileInfo(Path.Combine(_webHostEnvironment.WebRootPath, "images", "captcha.jpg")),
                 PictureAlignment.Right);
 
             return package;

SampleWebApp.Core/Program.cs

@@ -1,20 +1,22 @@
 using System.IO;
 using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Hosting;
 
 namespace SampleWebApp.Core
 {
     public class Program
     {
         public static void Main(string[] args)
         {
-            var host = new WebHostBuilder()
-                .UseKestrel()
-                .UseContentRoot(Directory.GetCurrentDirectory())
-                .UseIISIntegration()
-                .UseStartup<Startup>()
-                .Build();
+            var host = CreateHostBuilder(args).Build();
 
             host.Run();
         }
+
+        public static IHostBuilder CreateHostBuilder(string[] args)
+        {
+            return Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder => webBuilder.UseStartup<Startup>());
+        }
     }
 }

SampleWebApp.Core/SampleWebApp.Core.csproj

@@ -1,13 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
   <PropertyGroup>
-    <TargetFramework>netcoreapp2.2</TargetFramework>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <ApplicationIcon />
+    <OutputType>Exe</OutputType>
+    <StartupObject />
   </PropertyGroup>
   <ItemGroup>
     <Folder Include="wwwroot\" />
-  </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.All" Version="2.2.8" />
-  </ItemGroup>
+  </ItemGroup>  
   <ItemGroup>
     <ProjectReference Include="..\EPPlus\EPPlus.MultiTarget.csproj" />
   </ItemGroup>

SampleWebApp.Core/Startup.cs

@@ -8,15 +8,24 @@ public class Startup
     {
         public void ConfigureServices(IServiceCollection services)
         {
-            services.AddMvc();
+            services.AddControllersWithViews();
         }
 
-        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
         {
             app.UseDeveloperExceptionPage();
-            app.UseMvcWithDefaultRoute();
-            app.UseDefaultFiles();
+
+            app.UseHttpsRedirection();
             app.UseStaticFiles();
+
+            app.UseRouting();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllerRoute(
+                    name: "default",
+                    pattern: "{controller=Home}/{action=Index}/{id?}");
+            });
         }
     }
 }