import axios from "axios";

  componentDidMount() {
    const promise = axios.get("https://localhost:5001/api/posts");
    console.log(promise);
  }

public void ConfigureServices(IServiceCollection services)
{
    services.AddCors(options =>
    {
       options.AddPolicy("ReactCorsPolicy",
          builder => builder
            .AllowAnyMethod()
            .AllowAnyHeader()
            .WithOrigins("http://localhost:3000")
            .AllowCredentials()
            .Build());
    });
    services.AddSingleton<IPostsDataSource, PostsDataSource>();
    services.AddControllers();
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
      app.UseDeveloperExceptionPage();
    }

    app.UseHttpsRedirection();

    app.UseRouting();

    //app.UseAuthentication();
    //app.UseAuthorization();

    app.UseCors("ReactCorsPolicy");

    app.UseAuthorization();

    app.UseEndpoints(endpoints =>
    {
       endpoints.MapControllers();
    });
}

  async componentDidMount() {
    const promise = axios.get("https://localhost:5001/api/posts");
    console.log(promise);
    const response = await promise;
    console.log(response);
  }

  async componentDidMount() {
    const response = await axios.get("https://localhost:5001/api/posts");
    console.log(response);
  }

class App extends Component {
  state = {
    posts: []
  };

  async componentDidMount() {
    const { data: posts } = await axios.get("https://localhost:5001/api/posts");
    this.setState({ posts }); // = { posts: posts }
  }

const apiEndpoint = "https://localhost:5001/api/posts";

class App extends Component {
  state = {
    posts: []
  };

  async componentDidMount() {
    const { data: posts } = await axios.get(apiEndpoint);
    this.setState({ posts });
  }

  handleAdd = async () => {
    const newPost = {
      title: "new Title ...",
      body: "new Body  ...",
      userId: 1
    };
    const { data: post } = await axios.post(apiEndpoint, newPost);
    console.log(post);

    const posts = [post, ...this.state.posts];
    this.setState({ posts });
  };

  handleUpdate = async post => {
    post.title = "Updated";
    const { data: updatedPost } = await axios.put(
      `${apiEndpoint}/${post.id}`,
      post
    );
    console.log(updatedPost);

    const posts = [...this.state.posts];
    const index = posts.indexOf(post);
    posts[index] = { ...post };
    this.setState({ posts });
  };

  handleDelete = async post => {
    await axios.delete(`${apiEndpoint}/${post.id}`);

    const posts = this.state.posts.filter(item => item.id !== post.id);
    this.setState({ posts });
  };

1. عدم پشتیبانی از Pagination: چون API، تمامی کاربران را به سمت کلاینت ارسال میکند؛ به همین جهت، هم با مشکل کارآیی (performance) در آینده مواجه میشویم و هم امکان گذاشتن صفحه بندی (Pagination) وجود نخواهد داشت. 
2. عدم پشتیبانی از Sorting: اگر در گرید نمایش داده شده کاربر بخواهد اطلاعات را Sort کند، چون چنین امکانی هنوز برای API ما تعریف نشده، این عملیات سمت سرور امکان پذیر نیست.
3. عدم پشتیبانی از Filtering: همیشه نمایش تمامی اطلاعات مفید نیست. در اکثر مواقع ما نیاز داریم تا قسمتی از اطلاعات را با شرطی خاص، برگردانیم. به طور مثال لیست کاربران فعال در سامانه یا لیست کاربران غیرفعال. 

Button button;
switch (UserSettings.UserSkinType)
{
   case UserSkinTypes.Normal:
      button = new Button();
      break;
   case UserSkinTypes.Fancy:
      button = new FancyButton();
      break;
}

 Button button = ButtonFactory.CreateButton();

 Button button = ServiceLocator.Create(IButton.Class)

Button button = GetTheButton();
Form1 frm = new Form1(button);

  "apps": [
    {
      "assets": [
        "assets",
        "favicon.ico"
      ],
      "styles": [
        "styles.css"
      ],
      "scripts": [],

> npm install bootstrap --save
> npm install ngx-bootstrap --save

"dependencies": {
   "bootstrap": "^3.3.7",
   "ngx-bootstrap": "^1.6.6",

  "apps": [
    {
      "styles": [
    "../node_modules/bootstrap/dist/css/bootstrap.min.css",
        "styles.css"
      ],

"scripts": [
   "../node_modules/jquery/dist/jquery.js",
   "../node_modules/bootstrap/dist/js/bootstrap.js"
],

import { AlertModule } from 'ngx-bootstrap';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,

    AlertModule.forRoot()
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

<h1>
  {{title}}
</h1>

<button class="btn btn-primary">Hello!</button>

<alert type="success">Alert success!</alert>

XmlException Was unhandeled  
The 'img' start tag on line 1 position 1604 does not match the end tag of 'a'. Line 1, position 1766

PM> Install-Package HtmlAgilityPack 

HtmlDocument xhtml = Crawler.GetXHtmlFromUri("http://www.london2012.com/athlete/hadadi-ehsan-1077408/");
HtmlNode tempNode = xhtml.DocumentNode.SelectSingleNode("//table[@class='athleteBio']/tbody/tr[4]");



string temp = tempNode.FirstChild.FirstChild.InnerText.Replace(" ", "").Trim();
athlete.Birthday = DateTime.Parse(temp.Substring(0, 10), new CultureInfo("en-GB")); 



tempNode = xhtml.DocumentNode.SelectSingleNode("//div[@class='athletePhotoMedals']/div/div/img");
athlete.LargePhotoUri = tempNode.GetAttributeValue("src", ""); 

Install-Package Microsoft.AspNet.WebApi.HelpPage

@Html.ActionLink("API", "Index", "Help", new { area = "" }, null)

protected void Application_Start()
{
    // Add this code, if not present.
    AreaRegistration.RegisterAllAreas();

    // ...
}

config.SetDocumentationProvider(new XmlDocumentationProvider(
    HttpContext.Current.Server.MapPath("~/App_Data/XmlDocument.xml")));

/// <summary>
/// Gets some very important data from the server.
/// </summary>
public IEnumerable<string> Get()
{
    return new string[] { "value1", "value2" };
}

/// <summary>
/// Looks up some data by ID.
/// </summary>
/// <param name="id">The ID of the data.</param>
public string Get(int id)
{
    return "value";
}

[ApiExplorerSettings(IgnoreApi=true)]
public HttpResponseMessage Get(int id) {  }

using Stimulsoft.Base.Services;
using Stimulsoft.Report;
using Stimulsoft.Report.Components;
using Stimulsoft.Report.Design;
using Stimulsoft.Report.Design.Toolbars;
using Stimulsoft.Report.Render;
using Stimulsoft.Report.Units;

//ایجاد یک شی از ریپورت            
StiReport report = new StiReport();
//ریست کردن تنظیمات به حالت پیشفرض
 report.Reset();
//ریست کردن تنظیمات سرویس‌های StiConfig.Reset();
//ریست کردن تنظیمات چاپ
 StiSettings.Clear();

            

            //تنظیم عنوان ریپورت به صورت دلخواه
            StiOptions.Designer.DesignerTitle = title + " طراحی فرم ";
            StiOptions.Designer.DesignerTitleText = title + " طراحی فرم ";
            //غیرفعال شدن نمایش تب کدنویسی
            StiOptions.Designer.CodeTabVisible = false;
            //فعال کردن امکان RightToLeft
            StiOptions.Designer.UseRightToLeftGlobalizationEditor = true;
            //غیرفعال شدن قابلیت تغییر نام ریپورت توسط کاربر
            StiOptions.Designer.CanDesignerChangeReportFileName = false;
            //غیر فعال کردن تشخیص اتوماتیک زبان پیش فرض UI طراحی
            StiOptions.Designer.UseSimpleGlobalizationEditor = false;

            //تنظیم تم ریپورت از حالت استاندارد به ریبون
            StiOptions.Windows.GlobalGuiStyle = StiGlobalGuiStyle.Office2010Blue;
            //فعال سازی تم ریبون
            StiOptions.Designer.IsRibbonGuiEnabled = true;

BusinessObjectsCategory - DataSourcesCategory -VariablesCategory

StiOptions.Designer.Panels.Dictionary.ShowEmptyBusinessObjectsCategory = false;
StiOptions.Designer.Panels.Dictionary.ShowEmptyDataSourcesCategory = false;
StiOptions.Designer.Panels.Dictionary.ShowEmptyVariablesCategory = false;

//غیر فعال کردن سرویس‌های پنل
            Stimulsoft.Report.Design.Panels.StiPropertiesPanelService propPanel = Stimulsoft.Report.Design.Panels.StiPropertiesPanelService.GetService();
            propPanel.ServiceEnabled = false;

            Stimulsoft.Report.Design.Panels.StiDictionaryPanelService dictPanel = Stimulsoft.Report.Design.Panels.StiDictionaryPanelService.GetService();
            dictPanel.ServiceEnabled = true;
            
            Stimulsoft.Report.Design.Panels.StiReportTreePanelService treePanel = Stimulsoft.Report.Design.Panels.StiReportTreePanelService.GetService();
            treePanel.ServiceEnabled = false;

            Stimulsoft.Report.Design.Toolbars.StiToolsToolbarService cpanel = Stimulsoft.Report.Design.Toolbars.StiToolsToolbarService.GetService();
            cpanel.ServiceEnabled = false;
            StiOptions.Dictionary.BusinessObjects.AddBusinessObjectAssemblyToReferencedAssembliesAutomatically = false;
            StiOptions.Dictionary.BusinessObjects.AllowProcessNullItemsInEnumerables = false;
            StiOptions.Dictionary.BusinessObjects.AllowUseDataColumn = false;
            StiOptions.Dictionary.BusinessObjects.AllowUseFields = false;
            StiOptions.Dictionary.BusinessObjects.AllowUseProperties = false;
            StiOptions.Dictionary.BusinessObjects.CheckTableDuplication = false;
           
            

            StiOptions.Dictionary.ShowOnlyAliasForDataSource = true;
            StiOptions.Dictionary.ShowOnlyAliasForDataColumn = true;
            StiOptions.Dictionary.ShowOnlyAliasForTotal = true;
            dictPanel.ShowNewButton = false;
            dictPanel.ShowActionsButton = false;
            dictPanel.ShowBusinessObjectNewMenuItem = false;
            dictPanel.ShowCalcColumnNewMenuItem = false;
            dictPanel.ShowCategoryNewMenuItem = false;
            dictPanel.ShowCollapseAllMenuItem = true;
            dictPanel.ShowColumnNewMenuItem = false;
            dictPanel.ShowConnectionNewMenuItem = false;
            dictPanel.ShowContextMenu = false;
            dictPanel.ShowCreateFieldOnDoubleClick = false;
            dictPanel.ShowCreateLabel = false;
            dictPanel.ShowDataParameterNewMenuItem = false;
            dictPanel.ShowDataSourceNewMenuItem = false;
            dictPanel.ShowDataSourcesNewMenuItem = false;
            dictPanel.ShowDeleteButton = false;
            dictPanel.ShowDeleteForBusinessObject = false;
            dictPanel.ShowDeleteForDataColumn = false;
            dictPanel.ShowDeleteForDataConnection = false;
            dictPanel.ShowDeleteForDataParameter = false;
            dictPanel.ShowDeleteForDataRelation = false;
            dictPanel.ShowDeleteForDataSource = false;
            dictPanel.ShowDeleteForVariable = false;
            dictPanel.ShowDeleteMenuItem = false;
            dictPanel.ShowDictMergeMenuItem = false;
            dictPanel.ShowDictNewMenuItem = false;
            dictPanel.ShowDictOpenMenuItem = false;
            dictPanel.ShowDictSaveMenuItem = false;
            dictPanel.ShowDictXmlExportMenuItem = false;
            dictPanel.ShowDictXmlImportMenuItem = false;
            dictPanel.ShowDictXmlMergeMenuItem = false;
            dictPanel.ShowDownButton = false;
            dictPanel.ShowEditButton = false;
            dictPanel.ShowEditForBusinessObject = false;
            dictPanel.ShowEditForDataColumn = false;
            dictPanel.ShowEditForDataConnection = false;
            dictPanel.ShowEditForDataParameter = false;
            dictPanel.ShowEditForDataRelation = false;
            dictPanel.ShowEditForDataSource = false;
            dictPanel.ShowEditForVariable = false;
            dictPanel.ShowEditMenuItem = false;
            
            dictPanel.ShowExpandAllMenuItem = true;
            dictPanel.ShowMarkUsedMenuItem = false;
            dictPanel.ShowNewButton = false;
            dictPanel.ShowPropertiesForBusinessObject = false;
            dictPanel.ShowPropertiesForDataColumn = false;
            dictPanel.ShowPropertiesForDataConnection = false;
            dictPanel.ShowPropertiesForDataParameter = false;
            dictPanel.ShowPropertiesForDataRelation = false;
            dictPanel.ShowPropertiesForDataSource = false;
            dictPanel.ShowPropertiesForVariable = false;
            dictPanel.ShowPropertiesMenuItem = false;
            dictPanel.ShowRelationNewMenuItem = false;
            dictPanel.ShowRelationsImportMenuItem = false;
            dictPanel.ShowRemoveUnusedMenuItem = false;
            dictPanel.ShowSortItemsButton = false;
            dictPanel.ShowSynchronizeMenuItem = false;
            dictPanel.ShowUpButton = false;
            dictPanel.ShowUseAliases = true;
            dictPanel.ShowVariableNewMenuItem = false;
            dictPanel.ShowViewDataMenuItem = false;

//تنظیم زبان به فارسی
StiConfig.LoadLocalization("fa.xml");

<Comp1>This is a content coming from the parent</Comp1>

@page "/ParentComponent"

<h1 class="text-danger">Parent Child Component</h1>

<ChildComponent Title="This title is passed as a parameter from the Parent Component">
    A `Render Fragment` from the parent!
</ChildComponent>

<ChildComponent Title="This is the second child component"></ChildComponent>

@code {

}

<li class="nav-item px-3">
    <NavLink class="nav-link" href="ParentComponent">
       <span class="oi oi-list-rich" aria-hidden="true"></span> Parent/Child Relation
    </NavLink>
</li>

<div>
    <div class="alert alert-info">@Title</div>
    <div class="alert alert-success">
        @if (ChildContent == null)
        {
            <span> Hello, from Empty Render Fragment </span>
        }
        else
        {
            <span>@ChildContent</span>
        }
    </div>
</div>


@code {
    [Parameter]
    public string Title { get; set; }

    [Parameter]
    public RenderFragment ChildContent { get; set; }
}

<button class="btn btn-danger"
        @onclick="@(() => OnClickBtnMethod.InvokeAsync((1, "A message from child!")))">
   Show a message from the child!
</button>


@code {
    // ...

    [Parameter]
    public EventCallback<(int, string)> OnClickBtnMethod { get; set; }
}

@page "/ParentComponent"

<h1 class="text-danger">Parent Child Component</h1>

<ChildComponent
    OnClickBtnMethod="ShowMessage"
    Title="This title is passed as a parameter from the Parent Component">
    A `Render Fragment` from the parent!
</ChildComponent>

<ChildComponent Title="This is the second child component">
    <p><b>@MessageText</b></p>
</ChildComponent>

@code {
    string MessageText = "";

    private void ShowMessage((int Value, string Message) args)
    {
        MessageText = args.Message;
    }
}

@code {
    // ...

    [Parameter]
    public RenderFragment ChildContent { get; set; }

    [Parameter]
    public RenderFragment DangerChildContent { get; set; }
}

<ChildComponent
    OnClickBtnMethod="ShowMessage"
    Title="This title is passed as a parameter from the Parent Component">
    <ChildContent>
        A `Render Fragment` from the parent!
    </ChildContent>
    <DangerChildContent>
        A danger content from the parent!
    </DangerChildContent>
</ChildComponent>

    @if(DangerChildContent == null)
    {
        @if (ChildContent == null)
        {
            <span> Hello, from Empty Render Fragment </span>
        }
        else
        {
            <span>@ChildContent</span>
        }
    }
    else
    {
        <span>@DangerChildContent</span>
    }