_categoryService.AddNewCategory(category);
_uow.SaveAllChanges();

throw new InvalidOperationException();

return RedirectToAction("Index");

    public interface IEnumerator<out T> : IEnumerator, IDisposable
    {
        //
        // Summary:
        //     Gets the element in the collection at the current position of the enumerator.
        //
        // Returns:
        //     The element in the collection at the current position of the enumerator.
        T Current { get; }
    }

 public class AuthorizationPolicyProvider : DefaultAuthorizationPolicyProvider
    {
        private readonly LazyConcurrentDictionary<string, AuthorizationPolicy> _policies =
            new LazyConcurrentDictionary<string, AuthorizationPolicy>();

        public AuthorizationPolicyProvider(IOptions<AuthorizationOptions> options)
            : base(options)
        {
        }

        public override async Task<AuthorizationPolicy> GetPolicyAsync(string policyName)
        {
           //...
        }
    }

        public override async Task<AuthorizationPolicy> GetPolicyAsync(string policyName)
        {
          //...

            var policy = _policies.GetOrAdd(policyName, name =>
            {
                var permissionNames = policyName.Substring(PermissionAuthorizeAttribute.PolicyPrefix.Length).Split(',');

                return new AuthorizationPolicyBuilder()
                    .RequireClaim(CustomClaimTypes.Permission, permissionNames)
                    .Build();
            });

            return policy;
        }

        private byte[] addWaterMark(string filePath, string text)
        {
            using (var img = System.Drawing.Image.FromFile(filePath))
            {
                using (var memStream = new MemoryStream())
                {
                    using (var bitmap = new Bitmap(img))//avoid gdi+ errors
                    {
                        bitmap.Save(memStream, ImageFormat.Png);                        
                        var webImage = new WebImage(memStream);
                        webImage.AddTextWatermark(text, verticalAlign: "Top", horizontalAlign: "Left", fontColor: "Brown");
                        return webImage.GetBytes();
                    }
                }
            }
        }

dotnet tool install -g dotnet-ignore

dotnet tool list -g

dotnet tool update -g dotnet-ignore

dotnet tool uninstall -g dotnet-ignore

<PropertyGroup>
    <PackAsTool>true</PackAsTool>
    <ToolCommandName>dotnet-mytool</ToolCommandName>
    <PackageOutputPath>./nupkg</PackageOutputPath>
</PropertyGroup>

dotnet tool install --global --add-source ./nupkg globaltools

dotnet-mytool

https://www.nuget.org/packages/McMaster.Extensions.CommandLineUtils

[Command(Description="Add a new note")]
    public class NewNote
    {
        [Required]
        [Option(Description="title of note")]
        public string Title{ get; set; }

        [Option(Description="content of note")]
        public string Body{ get; set; }
    }

[Command(Description="Add a new note")]
    public class NewNote:BaseClass
    {
        [Required]
        [Option(Description="title of note")]
        public string Title{ get; set; }

        [Option(Description="content of note")]
        public string Body{ get; set; }

        public void OnExecute(IConsole console)
        {

            var dir = GetBaseDirectory();
            if(!Directory.Exists(dir))
            {
                Directory.CreateDirectory(dir);
            }
            var filePath = Path.Combine(dir, Title + ".txt");
            File.WriteAllText(filePath, Body);
            console.WriteLine("the note is saved");
        }
    }

public class BaseClass
    {
        protected string GetBaseDirectory(){
            var baseDirectory = Environment.CurrentDirectory;
            return (Path.Combine(baseDirectory, "notes"));
        }
    }

public class List:BaseClass
    {
        [Option(Description="search a phrase in notes title")]
        public string Grep{ get; set; }
        public void OnExecute(IConsole console)
        {
            try
            {
                var baseDirectory = GetBaseDirectory();

                var dir = new DirectoryInfo(baseDirectory);
                var files = dir.GetFiles();
                foreach(var file in files)
                {
                    if(!String.IsNullOrEmpty(Grep) && !file.Name.Contains(Grep))
                        continue;

                    console.WriteLine(Path.GetFileNameWithoutExtension(file.Name));
                }
            }
            catch (Exception e)
            {
                console.WriteLine(e.Message);
            }
        }
    }

[Command(Description="show contnet of note")]
    public class Show:BaseClass
    {
        [Required]
        [Option(Description="title of note")]
        public string Title{ get; set; }


        public void OnExecute(IConsole console){
            var baseDirectory = GetBaseDirectory();
            var file = Path.Combine(baseDirectory, Title+".txt");

            if(!File.Exists(file))
            {
                console.WriteLine("The Note NotFound...");
                return;
            }
            console.WriteLine(File.ReadAllText(file));

        }
    }

    [Command(Description="An Immediate Note Saver")]
    [Subcommand(typeof(NewNote),typeof(List),typeof(Show))]
    class Program
    {
        static int Main(string[] args)
        {
            return CommandLineApplication.Execute<Program>(args);
        }

        public int OnExecute(CommandLineApplication app, IConsole console)
        {
            console.WriteLine("You must specify a subcommand.");
            console.WriteLine();
            app.ShowHelp();
            return 1;
        }
    }

        static int Main(string[] args)
        {
            return CommandLineApplication.Execute<Program>(args);
        }

PS D:\projects\Samples\globaltools> dotnet-notes new-note -t "sample1" -b "this is body"
the note is saved
PS D:\projects\Samples\globaltools> dotnet-notes new-note -t "test1" -b "this is body of another note"
the note is saved
PS D:\projects\Samples\globaltools> dotnet-notes list
sample1
test1
PS D:\projects\Samples\globaltools> dotnet-notes list -g sa
sample1
PS D:\projects\Samples\globaltools> dotnet-notes show -t sample1
this is body

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;

namespace MvcApplication1.Controllers
{
    public class HomeController : Controller
    {
        //
        // GET: /Home/
        public ActionResult Index()
        {
            return View();
        }
    }
}

public abstract class ControllerBase : IController
public abstract class Controller : ControllerBase

The view 'Index' or its master was not found or no view engine supports the searched locations. The following locations were searched:
~/Views/Home/Index.aspx
~/Views/Home/Index.ascx
~/Views/Shared/Index.aspx
~/Views/Shared/Index.ascx
~/Views/Home/Index.cshtml
~/Views/Home/Index.vbhtml
~/Views/Shared/Index.cshtml
~/Views/Shared/Index.vbhtml

@{
    ViewBag.Title = "Index";
}
<h2>Index</h2>

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
    routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );
}

http://hostname/home/about

http://localhost/
http://localhost/home
http://localhost/home/about
http://localhost/process/list

public static void RegisterRoutes(RouteCollection routes)
{
    routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

    routes.MapRoute(
                "Process", // Route name
                "Process/{action}/{id}", // URL with parameters
                new { controller = "Process", action = "List", id = UrlParameter.Optional } // Parameter defaults
            );

    routes.MapRoute(
                "Default", // Route name
                "{controller}/{action}/{id}", // URL with parameters
                new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            );
}

    public class CustomViewCache : IViewLocationCache
    {

        private readonly static string s_key = "_customLookupCach" + Guid.NewGuid().ToString();
        private readonly IViewLocationCache _cache;

        public CustomViewCache(IViewLocationCache cache)
        {
            _cache = cache;
        }

        private static IDictionary<string, string> GetRequestCache(HttpContextBase httpContext)
        {
            var d = httpContext.Cache[s_key] as IDictionary<string, string>;
            if (d == null)
            {
                d = new Dictionary<string, string>();
                httpContext.Cache.Insert(s_key, d, null, Cache.NoAbsoluteExpiration, new TimeSpan(0, 15, 0));
            }
            return d;
        }

        public string GetViewLocation(HttpContextBase httpContext, string key)
        {
            var d = GetRequestCache(httpContext);
            string location;
            if (!d.TryGetValue(key, out location))
            {
                location = _cache.GetViewLocation(httpContext, key);
                d[key] = location;
            }
            return location;
        }

        public void InsertViewLocation(HttpContextBase httpContext, string key, string virtualPath)
        {
            _cache.InsertViewLocation(httpContext, key, virtualPath);
        }
    }

• متغیر موقتی ای را که تنها یک بار مقداردهی شده است، پیدا کنید (در صورتیکه متغیر چندین بار مقداردهی شده باشد، باید بازسازی جداسازی متغیرهای موقتی را اعمال نمایید).
  
• متغیر را به readonly تغییر دهید.
  
• کد را کامپایل نمایید تا اطمینان حاصل کنید متغیر تنها یک بار مقداردهی شده‌است.
  
• Expression سمت راست مقداردهی متغیر را به متد، منتقل نمایید. دو نکته در مورد متد تازه ایجاد شده:  
  
• این متد را به صورت private تعریف نمایید. در صورتی در آینده مصرف دیگری برای آن پیدا کردید می‌توانید سطح دسترسی آن‌را آزادتر نمایید. 
  
• اطمینان حاصل نمایید متد مورد نظر، شیء یا خصوصیتی را ویرایش نمی‌کند. در صورتیکه این کار را انجام می‌دهد، باید بخش ویرایش آن را از بخش پرس و جوی آن جدا نمایید (Separate query from modifier). 
  
• کد را مجددا کامپایل نمایید.  
  
• تمامی استفاده‌های متغیر را با فراخوانی متد ایجاد شده، تغییر دهید. 
  

public class OrderItem 
{ 
    private double quantity; 
    private double itemPrice; 
    public double CalculateTotal() 
    { 
        double basePrice = quantity * itemPrice; 

        if (basePrice > 1000) 
        { 
            return basePrice * 0.95; 
        } 
        else 
        { 
            return basePrice * 0.98; 
        } 
    } 
}

public class OrderItem 
{ 
    private double quantity; 
    private double itemPrice; 
    public double CalculateTotal() 
    { 
        if (BasePrice() > 1000) 
        { 
            return BasePrice() * 0.95; 
        } 
        else 
        { 
            return BasePrice() * 0.98; 
        } 
    } 
    private double BasePrice() 
    { 
        return quantity * itemPrice; 
    } 
}