Write XML Files asynchronously with .NET

Writing XML files asynchronously is a useful technique for improving the performance and scalability of your application. By using an asynchronous approach, you can write XML data to a file without blocking the main thread, allowing your application to continue running smoothly and respond to user input.

Once you have finished building your XML document, you can begin the asynchronous write operation by calling the SaveAsync method on the XDocument instance. This method takes a Stream object as a parameter, which specifies the location where the XML data will be written.

Finally, be sure to handle any exceptions that may be thrown during the write operation. You can do this using a try-catch block, or by using the await keyword in conjunction with the SaveAsync method.

Here is an example of how you might use these steps to write an XML file asynchronously in C#:

using System.Xml.Linq;
using System.IO;
using System.Threading.Tasks;

private async Task<MemoryStream> WriteXmlAsync(XDocument doc, string toFileName,
    CancellationToken cancellationToken)
{
    // Open a stream
    MemoryStream stream = new();

    // Open XmlWriter
    await using XmlWriter xmlWriter = XmlWriter.Create(stream, new XmlWriterSettings { Async = true });

    // Write the XML data to the file asynchronously
    await doc.SaveAsync(xmlWriter, cancellationToken).ConfigureAwait(false);

    return stream;
}

By using the SaveAsync method and following these steps, you can efficiently write XML data to a file without blocking the main thread of your application. This can help improve the performance and scalability of your code, particularly when working with large or complex XML documents.