test.cs

[ApiController]
[Route("signature")]
public class SignatureController : Controller
{
	[HttpPost("SignDocument")]
	public ActionResult SignDocument([FromBody] SignatureData signatureData)
	{
		byte[] bPDF;

		// create temporary ServerTextControl
		using (TXTextControl.ServerTextControl tx = new TXTextControl.ServerTextControl())
		{
			tx.Create();

			// load the document
			tx.Load(Convert.FromBase64String(signatureData.SignedDocument.Document),
			  TXTextControl.BinaryStreamType.InternalUnicodeFormat);

			// create a certificate
			X509Certificate2 cert = new X509Certificate2("App_Data/textcontrolself.pfx", "123");

			// assign the certificate to the signature fields
			TXTextControl.SaveSettings saveSettings = new TXTextControl.SaveSettings()
			{
				CreatorApplication = "TX Text Control Blazor Sample Application",
				SignatureFields = new DigitalSignature[] {
					new TXTextControl.DigitalSignature(cert, null, "txsign")
				}
			};

			// save the document as PDF
			tx.Save("App_Data/results_" + signatureData.UniqueId + ".pdf", TXTextControl.StreamType.AdobePDF, saveSettings);
		}

		return Ok();
	}
}