Create a blank React and ASP.NET Core application.

• Open Visual Studio .NET 2022 and create a new application of "React and ASP.NET Core" type:
  
  
• Configure the application to use .NET 8.0:
  

Server side: Add references to the Vintasoft assemblies to "ReactApp1.Server" project.

Server side: Specify drawing engine, which should be used by VintaSoft Imaging .NET SDK for drawing of 2D graphics.

• Add reference to the Vintasoft.Imaging.Drawing.SkiaSharp.dll assembly.
  
• Add reference to the SkiaSharp nuget-package version 2.88.9.
• Open "Program.cs" file in "ReactApp1.Server" project, add code line "Vintasoft.Imaging.Drawing.SkiaSharp.SkiaSharpDrawingFactory.SetAsDefault();" at the beginning of file - added code specifies that VintaSoft Imaging .NET SDK should use SkiaSharp library for drawing of 2D graphics.

• Add reference to the Vintasoft.Imaging.Gdi.dll assembly.
  
• Open "Program.cs" file in "ReactApp1.Server" project, add code line "Vintasoft.Imaging.Drawing.Gdi.GdiGraphicsFactory.SetAsDefault();" at the beginning of file - added code specifies that VintaSoft Imaging .NET SDK should use System.Drawing library for drawing of 2D graphics.

Server side: Create web services, which allow to upload/download file, manage image collection, get information about images, get thumbnails and render image tiles.

• Create web service that allows to upload/download file

  • Press the right mouse button on the "Controllers" folder and select the "Add => Controller..." menu from context menu
    
  • Select "Empty API controller" template, set the controller name to the "MyVintasoftFileApiController" and press the "Add" button
    
  • Specify that MyVintasoftFileApiController class is derived from Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftFileApiController class
    
    Here are source codes of MyVintasoftFileApiController class:
    
    • C#

    namespace ReactApp1.Server.Controllers
    {
        public class MyVintasoftFileApiController : Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftFileApiController
        {
    
            public MyVintasoftFileApiController(IWebHostEnvironment hostingEnvironment)
                : base(hostingEnvironment)
            {
            }
    
        }
    }
    
    

• Create web service that allows to manage image collection

  • Press the right mouse button on the "Controllers" folder and select the "Add => Controller..." menu from context menu
    
  • Select "Empty API controller" template, set the controller name to the "MyVintasoftImageCollectionApiController" and press the "Add" button
    
  • Specify that MyVintasoftImageCollectionApiController class is derived from Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftImageCollectionApiController class
    
    Here are source codes of MyVintasoftImageCollectionApiController class:
    
    • C#

    namespace ReactApp1.Server.Controllers
    {
        public class MyVintasoftImageCollectionApiController : Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftImageCollectionApiController
        {
    
            public MyVintasoftImageCollectionApiController(IWebHostEnvironment hostingEnvironment)
                : base(hostingEnvironment)
            {
            }
    
        }
    }
    
    

• Create web service that allows to get information about images, get thumbnails and render image tiles

  • Press the right mouse button on the "Controllers" folder and select the "Add => Controller..." menu from context menu
    
  • Select "Empty API controller" template, set the controller name to the "MyVintasoftImageApiController" and press the "Add" button
    
  • Specify that MyVintasoftImageApiController class is derived from Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftImageApiController class
    
    Here are source codes of MyVintasoftImageApiController class:
    
    • C#

    namespace ReactApp1.Server.Controllers
    {
        public class MyVintasoftImageApiController : Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftImageApiController
        {
    
            public MyVintasoftImageApiController(IWebHostEnvironment hostingEnvironment)
                : base(hostingEnvironment)
            {
            }
    
        }
    }
    
    

Server side: Create CORS-policy that allows to access web services from client side.

• Open the "Program.cs" file in "ReactApp1.Server" project and add code that:
  • Creates CORS-policy that allows to access web services from "localhost"
  • Enables CORS usage in "ReactApp1.Server" project
  
  Here are source codes of "Program.cs" file after update:
  
  • C#

  Vintasoft.Imaging.Drawing.SkiaSharp.SkiaSharpDrawingFactory.SetAsDefault();
  
  var builder = WebApplication.CreateBuilder(args);
  
  // Add services to the container.
  
  builder.Services.AddControllers();
  
  builder.Services.AddCors(options =>
  {
      options.AddPolicy(name: "CorsPolicy1", policy =>
      {
          policy.SetIsOriginAllowed(origin => new Uri(origin).Host == "localhost").AllowAnyHeader().AllowAnyMethod();
      });
  });
  
  var app = builder.Build();
  
  app.UseDefaultFiles();
  app.UseStaticFiles();
  
  // Configure the HTTP request pipeline.
  
  app.UseHttpsRedirection();
  
  app.UseAuthorization();
  
  app.UseCors("CorsPolicy1");
  
  app.MapControllers();
  
  app.MapFallbackToFile("/index.html");
  
  app.Run();
  
  

Server side: Update launch URL in 'launchSettings.json' file.

• Open file "Properties\launchSettings.json" in "ReactApp1.Server" and clear launch URL:
  

Server side: Copy the default test PDF document to a server side.

• Create folder "UploadedImageFiles\SessionID" in "ReactApp1.Server" project and copy test PDF document "<SdkInstallPath>\VintaSoft\Imaging .NET 14.0\Examples\ASP.NET Core\CSharp\AspNetCoreImagingDemo\wwwroot\UploadedImageFiles\VintasoftImagingDemo.pdf" to the folder. This document will be displayed in document viewer.

Compile the project for restoring dependencies using 'npm'.

Delete files, which are not necessary in this tutorial.

• Delete files "WeatherForecast.cs" and "Controllers\WeatherForecastController.cs" in "ReactApp1.Server" project - the ASP.NET Core Web API controller WeatherForecast is not necessary in this tutorial.
  
  
• Delete files "src\App.css" and "src\App.jsx" - this React-component is not necessary in this tutorial.

Client side: Add JavaScript files to the "reactapp1.client" project.

• Copy Vintasoft.Shared.js and Vintasoft.Imaging.js files from "<InstallPath>\VintaSoft Imaging .NET 14.0\Bin\JavaScript\" folder into "public\" folder.
  
  
• Add references to Vintasoft JavaScript files to the header of "index.html" file:
  
  
  Here are source codes of "index.html" file:
  
  • HTML

  <!doctype html>
  <html lang="en">
  <head>
      <meta charset="UTF-8" />
      <link rel="icon" type="image/svg+xml" href="/vite.svg" />
      <meta name="viewport" content="width=device-width, initial-scale=1.0" />
      <title>Vite + React</title>
  
      <link rel="stylesheet" type="text/css" href="src/ImageViewerDemo.css">
  
      <script src="public/Vintasoft.Shared.js" type="text/javascript"></script>
      <script src="public/Vintasoft.Imaging.js" type="text/javascript"></script>
  </head>
    <body>
      <div id="root"></div>
      <script type="module" src="/src/main.jsx"></script>
    </body>
  </html>
  
  

  
  
• Add CSS-styles for this demo to the "src\ImageViewerDemo.css" file:
  
  
  Here are source codes of "ImageViewerDemo.css" file:
  
  • HTML

  h1 {
      width: 1200px;
      text-align: center;
  }
  
  .imageViewerDemoContainer {
      display: flex;
  }
  
  .thumbnailViewerContainer {
      width: 200px;
      height: 800px;
  }
  
  .imageViewerContainer {
      width: 1200px;
      height: 800px;
  }
  
  

Client side: Create React-component that displays image viewer.

• Create "ImageViewerDemo.jsx" file that will contain source codes of React-component (ImageViewerDemo class):
  • Select "Add => New Item..." context menu for folder "src\" => "Add new item" dialog will appear
  • Select "JSX File" type for new item
  • Set "ImageViewerDemo.jsx" as element name
  • Click the "Add" button => dialog will be closed and file "ImageViewerDemo.jsx" will be added into folder "src\"
  
  Add ImageViewerDemo class declaration with 'render' function (renders demo header, div-element for image viewer, div-element for thumbnail viewer) to the "ImageViewerDemo.jsx" file:
  
  
  Add 'componentDidMount' function (contains JavaScript code that initializes and creates image viewer) to the ImageViewerDemo class:
  
  
  Here are source codes of "ImageViewerDemo.jsx" file:
  
  • JavaScript

  import { Component } from 'react';
  
  export class ImageViewerDemo extends Component {
      static displayName = ImageViewerDemo.name;
      static _isInitialized = false;
  
      render() {
          return (
              <div>
                  <h1>VintaSoft Image Viewer Demo (React + ASP.NET Core)</h1>
  
                  <div className="imageViewerDemoContainer">
                      <div id="WebThumbnailViewer1Div" className="thumbnailViewerContainer"></div>
                      <div id="WebImageViewer1Div" className="imageViewerContainer"></div>
                  </div>
              </div>
          );
      }
  
      componentDidMount() {
          if (this._isInitialized)
              return;
          this._isInitialized = true;
  
          var Vintasoft = window.Vintasoft;
  
          // set the session identifier
          Vintasoft.Shared.WebImagingEnviromentJS.set_SessionId("SessionID");
  
          // specify web services, which should be used by Vintasoft Web Document Viewer
          Vintasoft.Shared.WebServiceJS.defaultFileService =
              new Vintasoft.Shared.WebServiceControllerJS("https://localhost:7240/vintasoft/api/MyVintasoftFileApi");
          Vintasoft.Shared.WebServiceJS.defaultImageCollectionService =
              new Vintasoft.Shared.WebServiceControllerJS("https://localhost:7240/vintasoft/api/MyVintasoftImageCollectionApi");
          Vintasoft.Shared.WebServiceJS.defaultImageService =
              new Vintasoft.Shared.WebServiceControllerJS("https://localhost:7240/vintasoft/api/MyVintasoftImageApi");
  
          // create thumbnail viewer
          let thumbnailViewer = new Vintasoft.Imaging.UI.WebThumbnailViewerJS("WebThumbnailViewer1Div");
          // specify that thumbnail viewer should not cache thumbnails on server side
          thumbnailViewer.set_UseCache(false);
  
          // create image viewer
          let imageViewer = new Vintasoft.Imaging.UI.WebImageViewerJS("WebImageViewer1Div");
          // specify that image viewer should not cache image tiles on server side
          imageViewer.set_UseCache(false);
  
          // specify that image viewer depends from thumbnail viewer
          imageViewer.set_MasterViewer(thumbnailViewer);
  
          // open file from session folder and add images from file to the image viewer
          imageViewer.get_Images().openFile("VintasoftImagingDemo.pdf");
      }
  
  }
  

  
  
• Add created React-component to the React-application code - "src\main.jsx" file.
  
  
  Here are source codes of "main.jsx" file after update:
  
  • JavaScript

  import React from 'react'
  import ReactDOM from 'react-dom/client'
  import { ImageViewerDemo } from './ImageViewerDemo.jsx'
  import './index.css'
  
  ReactDOM.createRoot(document.getElementById('root')).render(
      <React.StrictMode>
          <ImageViewerDemo />
      </React.StrictMode>,
  )
  
  

Run React and ASP.NET Core application and see the result.