Add project files.

Author: CoreProgramm

ExportExcel-in-ASPNetCore.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31912.275
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ExportExcel-in-ASPNetCore", "ExportExcel-in-ASPNetCore\ExportExcel-in-ASPNetCore.csproj", "{E58F8DEF-0269-4F30-8728-D81BA6F62250}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E58F8DEF-0269-4F30-8728-D81BA6F62250}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E58F8DEF-0269-4F30-8728-D81BA6F62250}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E58F8DEF-0269-4F30-8728-D81BA6F62250}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E58F8DEF-0269-4F30-8728-D81BA6F62250}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {C8A750E2-A817-4DB1-8875-8803B03A4060}
+	EndGlobalSection
+EndGlobal

ExportExcel-in-ASPNetCore/Controllers/HomeController.cs

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+using ClosedXML.Excel;
+using ExportExcel_in_ASPNetCore.Models;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ExportExcel_in_ASPNetCore.Controllers
+{
+    public class HomeController : Controller
+    {
+        private readonly ILogger<HomeController> _logger;
+        private readonly myDataContext _context;
+
+        public HomeController(ILogger<HomeController> logger, myDataContext context)
+        {
+            _logger = logger;
+            _context = context;
+        }
+
+        public IActionResult Index()
+        {
+            List<Customer> customers = _context.customers.ToList();
+            return View(customers);
+        }
+        [HttpPost]
+        public IActionResult ExportExcel()
+        {
+            var customers = _context.customers.ToList();
+            using (XLWorkbook wb = new XLWorkbook())
+            {
+                wb.Worksheets.Add(Common.ToDataTable(customers.ToList()));
+                using (MemoryStream stream = new MemoryStream())
+                {
+                    wb.SaveAs(stream);
+                    return File(stream.ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "customer.xlsx");
+                }
+            }
+            return View();
+        }
+
+        public IActionResult Privacy()
+        {
+            return View();
+        }
+
+        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+        public IActionResult Error()
+        {
+            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
+        }
+    }
+}

ExportExcel-in-ASPNetCore/ExportExcel-in-ASPNetCore.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>net5.0</TargetFramework>
+    <RootNamespace>ExportExcel_in_ASPNetCore</RootNamespace>
+    <CopyRefAssembliesToPublishDirectory>false</CopyRefAssembliesToPublishDirectory>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="ClosedXML" Version="0.95.4" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation" Version="5.0.9" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.1.1" />
+  </ItemGroup>
+
+</Project>

ExportExcel-in-ASPNetCore/Models/Common.cs

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+using System;
+using System.Collections.Generic;
+using System.Data;
+using System.Reflection;
+
+namespace ExportExcel_in_ASPNetCore.Models
+{
+    public static class Common
+    {
+        public static DataTable ToDataTable<T>(List<T> items)
+        {
+            DataTable dataTable = new DataTable(typeof(T).Name);
+            //Get all the properties
+            PropertyInfo[] Props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
+            foreach (PropertyInfo prop in Props)
+            {
+                //Setting column names as Property names
+                dataTable.Columns.Add(prop.Name);
+            }
+            foreach (T item in items)
+            {
+                var values = new object[Props.Length];
+                for (int i = 0; i < Props.Length; i++)
+                {
+                    //inserting property values to datatable rows
+                    values[i] = Props[i].GetValue(item, null);
+                }
+                dataTable.Rows.Add(values);
+            }
+            //put a breakpoint here and check datatable
+            return dataTable;
+        }
+    }
+}

ExportExcel-in-ASPNetCore/Models/Customer.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace ExportExcel_in_ASPNetCore.Models
+{
+    public class Customer
+    {
+        [Key]
+        public int customer_id { get; set; }
+        public string first_name { get; set; }
+        public string last_name { get; set; }
+        public string phone { get; set; }
+        public string email { get; set; }
+        public string street { get; set; }
+        public string city { get; set; }
+        public string state { get; set; }
+        public string zip_code { get; set; }
+    }
+}

ExportExcel-in-ASPNetCore/Models/ErrorViewModel.cs

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+using System;
+
+namespace ExportExcel_in_ASPNetCore.Models
+{
+    public class ErrorViewModel
+    {
+        public string RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+    }
+}

ExportExcel-in-ASPNetCore/Models/myDataContext.cs

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+using Microsoft.EntityFrameworkCore;
+
+namespace ExportExcel_in_ASPNetCore.Models
+{
+    public class myDataContext : DbContext
+    {
+        public myDataContext(DbContextOptions<myDataContext> options) : base(options)
+        {
+        }
+
+        public DbSet<Customer> customers { get; set; }
+    }
+}

ExportExcel-in-ASPNetCore/Program.cs

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+using Microsoft.AspNetCore.Hosting;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ExportExcel_in_ASPNetCore
+{
+    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<Startup>();
+                });
+    }
+}

ExportExcel-in-ASPNetCore/Properties/launchSettings.json

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+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:32299",
+      "sslPort": 44347
+    }
+  },
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development",
+        "ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation"
+      }
+    },
+    "ExportExcel_in_ASPNetCore": {
+      "commandName": "Project",
+      "dotnetRunMessages": "true",
+      "launchBrowser": true,
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development",
+        "ASPNETCORE_HOSTINGSTARTUPASSEMBLIES": "Microsoft.AspNetCore.Mvc.Razor.RuntimeCompilation"
+      }
+    }
+  }
+}

ExportExcel-in-ASPNetCore/Startup.cs

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+using ExportExcel_in_ASPNetCore.Models;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.HttpsPolicy;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace ExportExcel_in_ASPNetCore
+{
+    public class Startup
+    {
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        public IConfiguration Configuration { get; }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            services.AddControllersWithViews();
+            string conStr = this.Configuration.GetConnectionString("DBConnection");
+            services.AddDbContext<myDataContext>(options => options.UseSqlServer(conStr));
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+            else
+            {
+                app.UseExceptionHandler("/Home/Error");
+                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
+                app.UseHsts();
+            }
+            app.UseHttpsRedirection();
+            app.UseStaticFiles();
+
+            app.UseRouting();
+
+            app.UseAuthorization();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllerRoute(
+                    name: "default",
+                    pattern: "{controller=Home}/{action=Index}/{id?}");
+            });
+        }
+    }
+}

ExportExcel-in-ASPNetCore/Views/Home/Index.cshtml

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+@using ExportExcel_in_ASPNetCore.Models;
+@model IEnumerable<Customer>
+@{
+    ViewData["Title"] = "Home Page";
+}
+<form method="post" asp-controller="Home" asp-action="ExportExcel">
+        <input type="submit" value="Export" class="btn btn-primary"/>
+</form>
+
+<table class="table table-bordered">
+        <tr>
+            <th>First Name</th>
+            <th>Last Name</th>
+            <th>Phone</th>
+            <th>Email</th>
+            <th>Street</th>
+            <th>City</th>
+            <th>State</th>
+            <th>Zip</th>
+        </tr>
+        @foreach (Customer customer in Model)
+        {
+            <tr>
+                <td>@customer.first_name</td>
+                <td>@customer.last_name</td>
+                <td>@customer.phone</td>
+                <td>@customer.email</td>
+                <td>@customer.street</td>
+                <td>@customer.city</td>
+                <td>@customer.state</td>
+                <td>@customer.zip_code</td>
+            </tr>
+        }
+    </table>
+ 
+    

ExportExcel-in-ASPNetCore/Views/Home/Privacy.cshtml

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

ExportExcel-in-ASPNetCore/Views/Shared/Error.cshtml

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+@model ErrorViewModel
+@{
+    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>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>