Create a blank "ASP.NET Core Web App (Model-View-Controller)" application.

Server side: Add references to the Vintasoft nuget-packages to the ASP.NET Core application.

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" nuget-package. Reference to the "SkiaSharp" nuget-package version 3.119.0 will be added automatically.
  
• Open "Program.cs" file, 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" nuget-package.
  
• Open "Program.cs" file, 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 WebApplication1.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 WebApplication1.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 WebApplication1.Controllers
    {
        public class MyVintasoftImageApiController : Vintasoft.Imaging.AspNetCore.ApiControllers.VintasoftImageApiController
        {
    
            public MyVintasoftImageApiController(IWebHostEnvironment hostingEnvironment)
                : base(hostingEnvironment)
            {
            }
    
        }
    }
    

Client side: Add Vintasoft JavaScript files to the project.

• Add the "wwwroot\lib\Vintasoft\" folder to ASP.NET Core application.
  
  
• Copy Vintasoft.Shared.js, and Vintasoft.Imaging.js files from "<InstallPath>\VintaSoft Imaging .NET 15.0\Bin\JavaScript\" folder into "wwwroot\lib\Vintasoft\" folder.
  

Client side: Add JavaScript code that allows to display image viewer.

• Create folder "wwwroot\UploadedImageFiles\SessionID" and copy test PDF document "<SdkInstallPath>\VintaSoft\Imaging .NET 15.0\Images\VintasoftImagingDemo.pdf" to the folder. This document will be displayed in image viewer.
  
  
• Open file "Views\Home\Index.cshtml".
  
  
  Add references to Vintasoft JavaScript files:
  
  Here is HTML code that adds references to Vintasoft JavaScript files:
  
  • HTML

  <script src="~/lib/Vintasoft/Vintasoft.Shared.js" type="text/javascript"></script>
  <script src="~/lib/Vintasoft/Vintasoft.Imaging.js" type="text/javascript"></script>
  
  

  
  
  Add HTML markup (a div-element that will display image viewer) to the web view:
  
  Here is HTML markup code:
  
  • HTML

  <div class="imageViewerDemoContainer">
      <div id="WebThumbnailViewer1Div" class="thumbnailViewerContainer"></div>
      <div id="WebImageViewer1Div" class="imageViewerContainer"></div>
  </div>
  
  

  
  
• Open "wwwroot\css\site.css" file, add CSS-style for "imageViewerDemoContainer", "thumbnailViewerContainer" and "imageViewerContainer" to the "site.css" file:
  • HTML

  html {
    font-size: 14px;
  }
  
  @media (min-width: 768px) {
    html {
      font-size: 16px;
    }
  }
  
  .btn:focus, .btn:active:focus, .btn-link.nav-link:focus, .form-control:focus, .form-check-input:focus {
    box-shadow: 0 0 0 0.1rem white, 0 0 0 0.25rem #258cfb;
  }
  
  html {
    position: relative;
    min-height: 100%;
  }
  
  body {
    margin-bottom: 60px;
  }
  
  .form-floating > .form-control-plaintext::placeholder, .form-floating > .form-control::placeholder {
    color: var(--bs-secondary-color);
    text-align: end;
  }
  
  .form-floating > .form-control-plaintext:focus::placeholder, .form-floating > .form-control:focus::placeholder {
    text-align: start;
  }
  
  .imageViewerDemoContainer {
      display: flex;
  }
  
  .thumbnailViewerContainer {
      width: 200px;
      height: 800px;
  }
  
  .imageViewerContainer {
      width: 1200px;
      height: 800px;
  }
  
  

  
  
  
• Open file "wwwroot\js\site.js", add JavaScript code that initializes and creates web image viewer:
  
  Here is JavaScript code that initializes and displays web image viewer:
  
  • JavaScript

  // 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("vintasoft/api/MyVintasoftFileApi");
  Vintasoft.Shared.WebServiceJS.defaultImageCollectionService =
      new Vintasoft.Shared.WebServiceControllerJS("vintasoft/api/MyVintasoftImageCollectionApi");
  Vintasoft.Shared.WebServiceJS.defaultImageService =
      new Vintasoft.Shared.WebServiceControllerJS("vintasoft/api/MyVintasoftImageApi");
  
  // create thumbnail viewer
  var thumbnailViewer = new Vintasoft.Imaging.UI.WebThumbnailViewerJS("WebThumbnailViewer1Div");
  // create image viewer
  var imageViewer = new Vintasoft.Imaging.UI.WebImageViewerJS("WebImageViewer1Div");
  // 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");
  
  

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