Create a new .Net Web API application:<\/strong> Next, we need to install the itextSharp NuGet package itself to use it in our application. We are going to install it using the NuGet package manager in Visual Studio 2022 using the following steps:<\/p>\n Create a folder named Content in the project where you installed itextSharp and then create an HTML file in that folder (as shown below). The project structure will now look like this (see image below).<\/p>\n Now open the HTML file you created and delete the <head> tag and everything inside that tag because itextSharp does not parse the <head> tag. We also need to add some style to the <h1> tag as well and for that, we are using inline CSS as shown above.<\/p>\n You can see that the visual studio created a controller inside the Controllers folder named WeatherForecastController<\/strong>. Now open that controller and replace the code inside the method Get() with the following code: You will see some errors after inserting this code because we need to include the necessary namespaces in our controller to use itextSharp. Now put the following code at the top of the controller file: After you include this most of the errors should be gone.<\/p>\n You can see that I have placed the main code that makes the pdf inside a try-catch block. If an exception occurred during the execution of the code then the control of the program will shift inside the catch block and the code inside it will be executed which sends an INTERNAL_SERVER_ERROR response to the client which made the request with the message inside the exception. This way the client will know that there was something wrong with the server.<\/p>\n Now, on to the explanation of the code inside the try block. <\/p>\n These are the first two lines of code inside the try block: The templatePath variable stores the path of the HTML file in the project with the help of the _env object. To use this object you need to include it in the controller\u2019s constructor as a dependency like this:<\/p>\n After this, the template variable stores the content of the HTML file as a string inside it using the ReadAllText() method of the System.IO.File namespace. Now, we have the output variable which will store the final pdf as a MemoryStream() object. The benefit of using the MemoryStream() object is that we don\u2019t need to store the pdf data in a file before sending it back to the client. <\/p>\n Now, we create an instance of the Document class which is named a document. You can specify the page size using the PageSize class\u2019s static properties such as A4, A5, etc\u2026
\nSo, first of all, open visual studio 2022 and create a new .net core web API application (as shown below)
\n![\"vscode1\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode1.png\")
\nAfter you click the Next <\/strong>button, name your application, and then click on the Create <\/strong>button in the last window. Now, after creating the solution, open it in visual studio 2022.<\/p>\nInstalling itextSharp NuGet package:<\/h3>\n
\n
\n![\"vscode2\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode2.png\")
\n<\/li>\n
\n![\"vscode3\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode3.png\")
\n<\/li>\nCreating the HTML file<\/h3>\n
\n![\"vscode4\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode4.png\")
<\/p>\n![\"vscode5\"](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode5.png\")
<\/p>\n
\nNext add a <h1> tag inside the
\n![\"vscode6\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode6.png\")
<\/p>\nConverting HTML to pdf using itextSharp<\/h3>\n
\ntry
\n {
\n \/\/ path to the html file
\n var templatePath = _env.ContentRootPath + @\"Content\\weatherForecastReport.html\";
\n \/\/ storing the content of the html file
\n var template = System.IO.File.ReadAllText(templatePath);
\n var output = new MemoryStream();
\n \/\/var input = new MemoryStream(Encoding.UTF8.GetBytes(template));
\n var document = new Document(PageSize.A4);
\n var writer = PdfWriter.GetInstance(document, output);
\n writer.CloseStream = false;
\n document.Open();
\n var htmlContext = new HtmlPipelineContext(null);
\n htmlContext.SetTagFactory(iTextSharp.tool.xml.html.Tags.GetHtmlTagProcessorFactory());
\n ICSSResolver cssResolver = XMLWorkerHelper.GetInstance().GetDefaultCssResolver(true);
\n var pipeline = new CssResolverPipeline(cssResolver, new HtmlPipeline(htmlContext, new PdfWriterPipeline(document, writer)));
\n var worker = new XMLWorker(pipeline, true);
\n var stringReader = new StringReader(template);
\n var xmlParser = new XMLParser(worker);
\n xmlParser.Parse(stringReader);
\n \/\/ closing the streams
\n document.Close();
\n writer.Close();
\n stringReader.Close();
\n worker.Close();
\n output.Position = 0;
\n return Ok(output);
\n }
\n catch (Exception ex)
\n {
\n return Problem(ex.Message, null, 500);
\n }<\/code><\/p>\n
\nusing iTextSharp.text;
\nusing iTextSharp.text.pdf;
\nusing iTextSharp.tool.xml;
\nusing iTextSharp.tool.xml.css;
\nusing iTextSharp.tool.xml.parser;
\nusing iTextSharp.tool.xml.pipeline.css;
\nusing iTextSharp.tool.xml.pipeline.end;
\nusing iTextSharp.tool.xml.pipeline.html;<\/code><\/p>\nExplanation of the above code:<\/h3>\n
\n var templatePath = _env.ContentRootPath + @\"Content\\weatherForecastReport.html\";
\n var template = System.IO.File.ReadAllText(templatePath);<\/code><\/p>\n![\"vscode7\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode7.png\")
<\/p>\n
\nAfter this, we create an instance of the PdfWriter class named writer using the document and output objects. The PdfWriter class is used to output the text to the pdf file. Next, we need to set the CloseStream property of the writer object to false.<\/p>\n
![\"vscode8\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode8.png\")
![\"vscode9\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode9.png\")
<\/p>\n![\"vscode10\"\/](\"https:\/\/studysection.com\/blog\/wp-content\/uploads\/2022\/08\/vscode10.png\")