public class User
{
    public User(string name)
    {
        Name = name;
    }
 
    public string Name { get; }
}


object[] data = { null, 42, new User("User 1"), new User("User 2") };
foreach (var item in data)
{
    if (item is null) Console.WriteLine("it's a const pattern");
    if (item is 42) Console.WriteLine("it's 42");
}

object[] data = { null, 42, new User("User 1"), new User("User 2") };
foreach (var item in data)
{
    if (item is int i) Console.WriteLine($"it's a type pattern with an int and the value {i}");
    if (item is User p) Console.WriteLine($"it's a person: {p.Name}");
    if (item is User p2 && p2.Name.StartsWith("U"))
    {
        Console.WriteLine($"it's a person starting with U {p2.Name}");
    }
}

object obj1 = "Hello, World!";
var str1 = obj1 as string;
if (str1 != null)
{
   Console.WriteLine(str1);
}

object obj2 = "Hello, World!";
if (obj2 is string str2)
{
   Console.WriteLine(str2);
}

object[] data = { null, 42, new User("User 1"), new User("User 2") };
foreach (var item in data)
{
    if (item is var x) Console.WriteLine($"it's a var pattern with the type {x?.GetType()?.Name}");
}

public static void SwitchPattern(object o)
{
    switch (o)
    {
        case null:
            Console.WriteLine("it's a constant pattern");
            break;
        case int i:
            Console.WriteLine("it's an int");
            break;
        case User p when p.Name.StartsWith("U"):
            Console.WriteLine($"a U person {p.Name}");
            break;
        case User p:
            Console.WriteLine($"any other person {p.Name}");
            break;
        case var x:
            Console.WriteLine($"it's a var pattern with the type {x?.GetType().Name} ");
            break;
        default:
            break;
    }
}

Select Case age
  Case 50
    ageBlock = "the big five-oh"
  Case 80, 81, 82, 83, 84, 85, 86, 87, 88, 89
    ageBlock = "octogenarian"
  Case 90 To 99
    ageBlock = "nonagenarian"
  Case Is >= 100
    ageBlock = "centenarian"
  Case Else
    ageBlock = "just old"
End Select

string ageBlock;
var age = 40;
switch (age)
{
    case 50:
        ageBlock = "the big five-oh";
        break;
    case var testAge when (new List<int> { 80, 81, 82, 83, 84, 85, 86, 87, 88, 89 }).Contains(testAge):
        ageBlock = "octogenarian";
        break;
    case var testAge when ((testAge >= 90) && (testAge <= 99)):
        ageBlock = "nonagenarian";
        break;
    case var testAge when (testAge >= 100):
        ageBlock = "centenarian";
        break;
    default:
        ageBlock = "just old";
        break;
}

Action<object, EventArgs> handler1 = (object obj, EventArgs args) => ShowDialog();

Action<object, EventArgs> handler2 = (object _, EventArgs _) => ShowDialog();
// OR
Action<object, EventArgs> handler3 = (_, _) => ShowDialog();

button1.Click += (s, e) => ShowDialog();

 button1.Click += (_, _) => ShowDialog();

namespace CS9Features
{
    public class LambdasTests
    {
        public void Test()
        {
            string text = "{0} is a good user !";
            PrintItems(item => string.Format(text, item));
        }

        private void PrintItems(Func<string, string> formatFunc)
        {
            foreach (var item in new[] { "User 1", "User 2" })
            {
                Console.WriteLine(formatFunc(item));
            }
        }
    }
}

const string text = "{0} is a good user !";
PrintItems(static item => string.Format(text, item));

public static void CreateUniqueIndex(this DbContext context, string tableName, string fieldName)
{
      context.Database.ExecuteSqlCommand("CREATE UNIQUE INDEX [IX_Unique_" + tableName 
+ "_" + fieldName + "] ON [" + tableName + "]([" + fieldName + "] ASC);");
}

public class MyDbMigrationsConfiguration : DbMigrationsConfiguration<MyContext>
{
        public BlogDbMigrationsConfiguration()
        {
            AutomaticMigrationsEnabled = true;
            AutomaticMigrationDataLossAllowed = true;
        }

        protected override void Seed(MyContext context)
        {
            CreateUniqueIndex(context, "table1", "field1");
            base.Seed(context);
        }
}

using System;
using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using System.Data.Objects;
using System.Linq;
using System.Linq.Expressions;
using System.Text.RegularExpressions;

namespace General
{
    public static class ContextExtensions
    {
        public static string GetTableName<T>(this DbContext context) where T : class
        {
            ObjectContext objectContext = ((IObjectContextAdapter)context).ObjectContext;
            return objectContext.GetTableName<T>();
        }

        public static string GetTableName<T>(this ObjectContext context) where T : class
        {
            var sql = context.CreateObjectSet<T>().ToTraceString();
            var regex = new Regex("FROM (?<table>.*) AS");
            var match = regex.Match(sql);
            string table = match.Groups["table"].Value;
            return table
                    .Replace("`", string.Empty)
                    .Replace("[", string.Empty)
                    .Replace("]", string.Empty)
                    .Replace("dbo.", string.Empty)
                    .Trim();
        }

        private static bool hasUniqueIndex(this DbContext context, string tableName, string indexName)
        {
            var sql = "SELECT count(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS where table_name = '" 
                      + tableName + "' and CONSTRAINT_NAME = '" + indexName + "'";
            var result = context.Database.SqlQuery<int>(sql).FirstOrDefault();
            return result > 0;
        }

        private static void createUniqueIndex(this DbContext context, string tableName, string fieldName)
        {
            var indexName = "IX_Unique_" + tableName + "_" + fieldName;
            if (hasUniqueIndex(context, tableName, indexName))
                return;

            var sql = "ALTER TABLE [" + tableName + "] ADD CONSTRAINT [" + indexName + "] UNIQUE ([" + fieldName + "])";
            context.Database.ExecuteSqlCommand(sql);
        }

        public static void CreateUniqueIndex<TEntity>(this DbContext context, Expression<Func<TEntity, object>> fieldName) where TEntity : class
        {
            var field = ((MemberExpression)fieldName.Body).Member.Name;
            createUniqueIndex(context, context.GetTableName<TEntity>(), field);
        }
    }
}

context.CreateUniqueIndex<User>(x=>x.Name);

<!--نحوه‌ی راست به چپ سازی -->
<div class="k-rtl">
    <textarea id="editor" rows="10" cols="30" style="height: 440px"></textarea>
</div>
 
@section JavaScript
{
    <script type="text/javascript">
        $(function () {
            $("#editor").kendoEditor({
                tools: [
                    "bold", "italic", "underline", "strikethrough", "justifyLeft",
                    "justifyCenter", "justifyRight", "justifyFull", "insertUnorderedList",
                    "insertOrderedList", "indent", "outdent", "createLink", "unlink",
                    "insertImage", "insertFile",
                    "subscript", "superscript", "createTable", "addRowAbove", "addRowBelow",
                    "addColumnLeft", "addColumnRight", "deleteRow", "deleteColumn", "viewHtml",
                    "formatting", "cleanFormatting", "fontName", "fontSize", "foreColor",
                    "backColor", "print"
                ],
                imageBrowser: {
                    messages: {
                        dropFilesHere: "فایل‌های خود را به اینجا کشیده و رها کنید"
                    },
                    transport: {
                        read: {
                            url: "@Url.Action("GetFilesList", "KendoEditorImages")",
                            dataType: "json",
                            contentType: 'application/json; charset=utf-8',
                            type: 'GET',
                            cache: false
                        },
                        destroy: {
                            url: "@Url.Action("DestroyFile", "KendoEditorImages")",
                            type: "POST"
                        },
                        create: {
                            url: "@Url.Action("CreateFolder", "KendoEditorImages")",
                            type: "POST"
                        },
                        thumbnailUrl: "@Url.Action("GetThumbnail", "KendoEditorImages")",
                        uploadUrl: "@Url.Action("UploadFile", "KendoEditorImages")",
                        imageUrl: "@Url.Action("GetFile", "KendoEditorImages")?path={0}"
                    }
                },
                fileBrowser: {
                    messages: {
                        dropFilesHere: "فایل‌های خود را به اینجا کشیده و رها کنید"
                    },
                    transport: {
                        read: {
                            url: "@Url.Action("GetFilesList", "KendoEditorFiles")",
                            dataType: "json",
                            contentType: 'application/json; charset=utf-8',
                            type: 'GET',
                            cache: false
                        },
                        destroy: {
                            url: "@Url.Action("DestroyFile", "KendoEditorFiles")",
                            type: "POST"
                        },
                        create: {
                            url: "@Url.Action("CreateFolder", "KendoEditorFiles")",
                            type: "POST"
                        },
                        uploadUrl: "@Url.Action("UploadFile", "KendoEditorFiles")",
                        fileUrl: "@Url.Action("GetFile", "KendoEditorFiles")?path={0}"
                    }
                }
            });
        });
    </script>
}

imageBrowser: {
    transport: {
        read: {
            url: "@Url.Action("GetFilesList", "KendoEditorImages")",
            dataType: "json",
            contentType: 'application/json; charset=utf-8',
            type: 'GET',
            cache: false
        }
    }
},

namespace KendoUI13.Controllers
{
    public class KendoEditorFilesController : Controller
    {
        //مسیر پوشه فایل‌ها
        protected string FilesFolder = "~/files";
 
        protected string KendoFileType = "f";
        protected string KendoDirType = "d";
 
        [HttpGet]
        public ActionResult GetFilesList(string path)
        {
            path = GetSafeDirPath(path);
            var imagesList = new DirectoryInfo(path)
                                .GetFiles()
                                .Select(fileInfo => new KendoFile
                                {
                                    Name = fileInfo.Name,
                                    Size = fileInfo.Length,
                                    Type = KendoFileType
                                }).ToList();
 
            var foldersList = new DirectoryInfo(path)
                                .GetDirectories()
                                .Select(directoryInfo => new KendoFile
                                {
                                    Name = directoryInfo.Name,
                                    Type = KendoDirType
                                }).ToList();
 
            return new ContentResult
            {
                Content = JsonConvert.SerializeObject(imagesList.Union(foldersList), new JsonSerializerSettings
                {
                    ContractResolver = new CamelCasePropertyNamesContractResolver()
                }),
                ContentType = "application/json",
                ContentEncoding = Encoding.UTF8
            };
        }
 
 
        protected string GetSafeDirPath(string path)
        {
            // path = مسیر زیر پوشه‌ی وارد شده
            if (string.IsNullOrWhiteSpace(path))
            {
                return Server.MapPath(FilesFolder);
            }
 
            //تمیز سازی امنیتی
            path = Path.GetDirectoryName(path);
            path = Path.Combine(Server.MapPath(FilesFolder), path);
            return path;
        } 
    }
}

namespace KendoUI13.Models
{
    public class KendoFile
    {
        public string Name { set; get; }
        public string Type { set; get; }
        public long Size { set; get; }
    }
}

imageBrowser: {
    transport: {
        destroy: {
            url: "@Url.Action("DestroyFile", "KendoEditorImages")",
            type: "POST"
        }
    }
},

namespace KendoUI13.Controllers
{
    public class KendoEditorFilesController : Controller
    {
        //مسیر پوشه فایل‌ها
        protected string FilesFolder = "~/files";
 
        protected string KendoFileType = "f";
        protected string KendoDirType = "d";
 
        [HttpPost]
        public ActionResult DestroyFile(string name, string path)
        {
            //تمیز سازی امنیتی
            name = Path.GetFileName(name);
            path = GetSafeDirPath(path);
 
            var pathToDelete = Path.Combine(path, name);
 
            var attr = System.IO.File.GetAttributes(pathToDelete);
            if ((attr & FileAttributes.Directory) == FileAttributes.Directory)
            {
                Directory.Delete(pathToDelete, recursive: true);
            }
            else
            {
                System.IO.File.Delete(pathToDelete);
            }
 
            return Json(new object[0]);
        } 
    }
}

imageBrowser: {
    transport: {
        create: {
            url: "@Url.Action("CreateFolder", "KendoEditorImages")",
            type: "POST"
        }
    }
},

namespace KendoUI13.Controllers
{
    public class KendoEditorFilesController : Controller
    {
        //مسیر پوشه فایل‌ها
        protected string FilesFolder = "~/files";
 
        protected string KendoFileType = "f";
        protected string KendoDirType = "d";
 
        [HttpPost]
        public ActionResult CreateFolder(string name, string path)
        {
            //تمیز سازی امنیتی
            name = Path.GetFileName(name);
            path = GetSafeDirPath(path);
            var dirToCreate = Path.Combine(path, name);
 
            Directory.CreateDirectory(dirToCreate);
 
            return KendoFile(new KendoFile
            {
                Name = name,
                Type = KendoDirType
            });
        }
 
        protected ActionResult KendoFile(KendoFile file)
        {
            return new ContentResult
            {
                Content = JsonConvert.SerializeObject(file,
                    new JsonSerializerSettings
                    {
                        ContractResolver = new CamelCasePropertyNamesContractResolver()
                    }),
                ContentType = "application/json",
                ContentEncoding = Encoding.UTF8
            };
        }
    }
}

imageBrowser: {
    transport: {
        thumbnailUrl: "@Url.Action("GetThumbnail", "KendoEditorImages")",
        uploadUrl: "@Url.Action("UploadFile", "KendoEditorImages")",
        imageUrl: "@Url.Action("GetFile", "KendoEditorImages")?path={0}"
    }
},

namespace KendoUI13.Controllers
{
    public class KendoEditorFilesController : Controller
    {
        //مسیر پوشه فایل‌ها
        protected string FilesFolder = "~/files";
 
        protected string KendoFileType = "f";
        protected string KendoDirType = "d";

 
        [HttpPost]
        public ActionResult UploadFile(HttpPostedFileBase file, string path)
        {
            //تمیز سازی امنیتی
            var name = Path.GetFileName(file.FileName);
            path = GetSafeDirPath(path);
            var pathToSave = Path.Combine(path, name);
 
            file.SaveAs(pathToSave);
 
            return KendoFile(new KendoFile
            {
                Name = name,
                Size = file.ContentLength,
                Type = KendoFileType
            });
        } 
    }
}

using System.Web.Mvc;
 
namespace KendoUI13.Controllers
{
    public class KendoEditorImagesController : KendoEditorFilesController
    {
        public KendoEditorImagesController()
        {
            // بازنویسی مسیر پوشه‌ی فایل‌ها
            FilesFolder = "~/images";
        }
 
        [HttpGet]
        [OutputCache(Duration = 3600, VaryByParam = "path")]
        public ActionResult GetThumbnail(string path)
        {
            //todo: create thumb/ resize image
 
            path = GetSafeFileAndDirPath(path);
            return File(path, "image/png");
        }
    }
}

@page "/counter"

<h1>Counter</h1>

<p>Current count: @currentCount</p>

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

@code {
    private int currentCount = 0;

    private void IncrementCount()
    {
        currentCount++;
    }
}

namespace BlazorStateManagement.Stores.CounterStore
{
    public class CounterState
    {
        public int Count { get; set; }
    }
}

using System;

namespace BlazorStateManagement.Stores.CounterStore
{
    public interface ICounterStore
    {
        void DecrementCount();
        void IncrementCount();
        CounterState GetState();

        void AddStateChangeListener(Action listener);
        void BroadcastStateChange();
        void RemoveStateChangeListener(Action listener);
    }
}

using System;
namespace BlazorStateManagement.Stores.CounterStore
{
    public class CounterStore : ICounterStore
    {
        private readonly CounterState _state = new();
        private Action _listeners;

        public CounterState GetState()
        {
            return _state;
        }

        public void IncrementCount()
        {
            _state.Count++;
            BroadcastStateChange();
        }

        public void DecrementCount()
        {
            _state.Count--;
            BroadcastStateChange();
        }

        public void AddStateChangeListener(Action listener)
        {
            _listeners += listener;
        }

        public void RemoveStateChangeListener(Action listener)
        {
            _listeners -= listener;
        }

        public void BroadcastStateChange()
        {
            _listeners.Invoke();
        }
    }
}

namespace BlazorStateManagement.Client
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var builder = WebAssemblyHostBuilder.CreateDefault(args);
            //...
            builder.Services.AddScoped<ICounterStore, CounterStore>();
            //...
        }
    }
}

@using BlazorStateManagement.Stores.CounterStore

@page "/counter"
@implements IDisposable

@inject ICounterStore CounterStore

<h1>Counter</h1>

<p>Current count: @CounterStore.GetState().Count</p>

<button class="btn btn-primary" @onclick="IncrementCount">Click me</button>

@code {
    protected override void OnInitialized()
    {
        base.OnInitialized();
        CounterStore.AddStateChangeListener(UpdateView);
    }

    private void IncrementCount()
    {
        CounterStore.IncrementCount();
    }

    private void UpdateView()
    {
        StateHasChanged();
    }

    public void Dispose()
    {
        CounterStore.RemoveStateChangeListener(UpdateView);
    }
}

@inject ICounterStore CounterStore

<li class="nav-item px-3">
   <NavLink class="nav-link" href="counter">
      <span class="oi oi-plus" aria-hidden="true"></span> Counter: @CounterStore.GetState().Count
   </NavLink>
</li>

@code {
    protected override void OnInitialized()
    {
        base.OnInitialized();
        CounterStore.AddStateChangeListener(() => StateHasChanged());
    }

    // ...
}

<script type="text/javascript">
var products = [];
$(function() {
    $.getJSON("/home/products", function(response) {
        products = response.products;
    });
});
</script>

 <script src="/file.js"></script>

<ul>
@foreach (var product in products)
{
  <li id="product@product.Id" data-rank="@product.Rank">@product.Name</li>
}
</ul>

<script type="text/javascript">
var product1Rank = $("#product1").data("rank");
</script>

 <script type="text/javascript">
var product1Name = "@product1.Name";
</script>

//سمت سرور
[HttpGet]
public ActionResult Index()
{
    var array = new[]
    {
        "Afghanistan",
        "Albania",
        "Algeria",
        "American Samoa",
        "Andorra",
        "Angola",
        "Anguilla",
        "Antarctica",
        "Antigua and/or Barbuda"
     };
     ViewBag.JsonString = new JavaScriptSerializer().Serialize(array);
     return View();
}

 //سمت کلاینت
<script type="text/javascript">
var jsonArray = @Html.Raw(@ViewBag.JsonString);
</script>

 <script type="text/javascript">
  var model = @Html.Raw(Json.Encode(Model));
  // your js code here
</script>

dotnet new blazor --interactivity Server

dotnet new blazor --interactivity WebAssembly

// ...

builder.Services.AddRazorComponents()
       .AddInteractiveServerComponents();

// ...

app.MapRazorComponents<App>()
   .AddInteractiveServerRenderMode();

// ...

builder.Services.AddRazorComponents()
    .AddInteractiveWebAssemblyComponents();

// ...

app.MapRazorComponents<App>()
    .AddInteractiveWebAssemblyRenderMode()
    .AddAdditionalAssemblies(typeof(Counter).Assembly);

<Project Sdk="Microsoft.NET.Sdk.BlazorWebAssembly">

  <PropertyGroup>
    <TargetFramework>net8.0</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <ProjectReference Include="..\BlazorDemoApp.Shared\BlazorDemoApp.Shared.csproj" />
  </ItemGroup>

</Project>

builder.Services.AddScoped<IProductStore, ProductStore>();

@using static Microsoft.AspNetCore.Components.Web.RenderMode
// ...
@using BlazorDemoApp.Client.Components.Store
@using BlazorDemoApp.Client.Components

<RelatedProducts ProductId="ProductId" @rendermode="@InteractiveWebAssembly"/>

using BlazorDemoApp.Services;
using Microsoft.AspNetCore.Mvc;

namespace BlazorDemoApp.Controllers;

[ApiController]
[Route("/api/[controller]")]
public class ProductsController : ControllerBase
{
    private readonly IProductStore _store;

    public ProductsController(IProductStore store) => _store = store;

    [HttpGet("[action]")]
    public IActionResult Related([FromQuery] int productId) => Ok(_store.GetRelatedProducts(productId));
}

builder.Services.AddControllers();
// ...
app.MapControllers();

@using BlazorDemoApp.Shared.Models
@inject HttpClient Http

<button class="btn btn-outline-secondary" @onclick="LoadRelatedProducts">Related products</button>

@if (_loadRelatedProducts)
{
    @if (_relatedProducts == null)
    {
        <p>Loading...</p>
    }
    else
    {
        <div class="mt-3">
            @foreach (var item in _relatedProducts)
            {
                <a href="/ProductDetails/@item.Id">
                    <div class="col-sm">
                        <h5 class="mt-0">@item.Title (@item.Price.ToString("C"))</h5>
                    </div>
                </a>
            }
        </div>
    }
}

@code{

    private IList<Product>? _relatedProducts;
    private bool _loadRelatedProducts;

    [Parameter]
    public int ProductId { get; set; }

    private async Task LoadRelatedProducts()
    {
        _loadRelatedProducts = true;
        var uri = $"/api/products/related?productId={ProductId}";
        _relatedProducts = await Http.GetFromJsonAsync<IList<Product>>(uri);
    }

}

System.InvalidOperationException: Cannot provide a value for property 'Http' on type 'RelatedProducts'.
There is no registered service of type 'System.Net.Http.HttpClient'.

<RelatedProducts ProductId="ProductId" @rendermode="@InteractiveWebAssembly"/>

builder.Services.AddScoped(sp => new HttpClient 
{ 
    BaseAddress = new Uri("http://localhost/") 
});

using BlazorDemoApp.Shared.Models;

namespace BlazorDemoApp.Shared.Data;

public interface IProductStore
{
    IList<Product> GetAllProducts();
    Product GetProduct(int id);
    Task<IList<Product>?> GetRelatedProducts(int productId);
}

public Task<IList<Product>?> GetRelatedProducts(int productId)
    {
        var product = ProductsDataSource.Single(x => x.Id == productId);
        return Task.FromResult<IList<Product>?>(ProductsDataSource.Where(p => product.Related.Contains(p.Id))
                                                                 .ToList());
    }

[HttpGet("[action]")]
public async Task<IActionResult> Related([FromQuery] int productId) =>
        Ok(await _store.GetRelatedProducts(productId));

public class ClientProductStore : IProductStore
{
    private readonly HttpClient _httpClient;

    public ClientProductStore(HttpClient httpClient) => _httpClient = httpClient;

    public IList<Product> GetAllProducts() => throw new NotImplementedException();

    public Product GetProduct(int id) => throw new NotImplementedException();

    public Task<IList<Product>?> GetRelatedProducts(int productId) =>
        _httpClient.GetFromJsonAsync<IList<Product>>($"/api/products/related?productId={productId}");
}

builder.Services.AddScoped<IProductStore, ClientProductStore>();
builder.Services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(builder.HostEnvironment.BaseAddress) });

@inject IProductStore ProductStore

private async Task LoadRelatedProducts()
{
   _loadRelatedProducts = true;
   _relatedProducts = await ProductStore.GetRelatedProducts(ProductId);
}