PdfIntegrationProviderOnDocumentPrinting Method |
Namespace: RadPdf.Integration
Inheriting classes can override this method to perform other tasks, modify aspects of printing the document, or cancel the download all together. If this method is overridden in an inheriting class, you must call the base implementation.
using System; using System.Web; using RadPdf.Data.Document.Objects.FormFields; using RadPdf.Integration; public class CustomPdfIntegrationProvider : PdfIntegrationProvider { public override void OnDocumentPrinting(DocumentPrintingEventArgs e) { base.OnDocumentPrinting(e); //Look for form field with the name "test" and see if it is null or has no value if( string.IsNullOrEmpty(((PdfTextField.)e.Document.Fields.Find("test")).Value) ) { //Cancel print e.Cancel = true; e.CancelMessage = "The form field \"test\" is not completed."; } } }
using Microsoft.AspNetCore.Builder; using Microsoft.Extensions.DependencyInjection; using Microsoft.Extensions.Hosting; using RadPdf; var builder = WebApplication.CreateBuilder(args); // Add services to the container. builder.Services.AddRazorPages(); builder.Services.AddSession(); // Setup WebApplication var app = builder.Build(); app.UseStaticFiles(); app.UseRouting(); app.UseSession(); app.UseAuthorization(); // Or however you normally process page requests app.MapRazorPages(); // Create middleware settings RadPdfCoreMiddlewareSettings settings = new RadPdfCoreMiddlewareSettings() { // Add SQL Server Connection String, if not using Lite Documents // Sample connection string below connects to a SQL Server Express instance on localhost // TrustServerCertificate=True is set to avoid a trust exception (e.g. "The certificate chain was issued by an authority that is not trusted.") // ConnectionString = @"Server=.\SQLExpress;Database=RadPdf;Trusted_Connection=Yes;TrustServerCertificate=True;", // Add License Key LicenseKey = "DEMO", // Attach the Integration Provider IntegrationProvider = new CustomPdfIntegrationProvider() // To run RAD PDF without the System Service, add UseService = false // If using Lite Documents without the System Service, a LiteStorageProvider must also be implemented //UseService = false }; // Add RAD PDF's middleware to app app.UseRadPdf(settings); app.Run();