Create Template and Extract Data from Invoice or Receipt in C#

CreateTemplateForInvoice.cs

// Create detector parameters for "Details" table
TemplateTableParameters detailsTableParameters = new TemplateTableParameters(new Rectangle(new Point(35, 320), new Size(530, 55)), null);

// Create detector parameters for "Summary" table
TemplateTableParameters summaryTableParameters = new TemplateTableParameters(new Rectangle(new Point(330, 385), new Size(220, 65)), null);

// Create a collection of template items
TemplateItem[] templateItems = new TemplateItem[]
{
	new TemplateField(new TemplateFixedPosition(new Rectangle(new Point(35, 135), new Size(100, 10))), "FromCompany"),
	new TemplateField(new TemplateFixedPosition(new Rectangle(new Point(35, 150), new Size(100, 35))), "FromAddress"),
	new TemplateField(new TemplateFixedPosition(new Rectangle(new Point(35, 190), new Size(150, 2))), "FromEmail"),
	new TemplateField(new TemplateFixedPosition(new Rectangle(new Point(35, 250), new Size(100, 2))), "ToCompany"),
	new TemplateField(new TemplateFixedPosition(new Rectangle(new Point(35, 260), new Size(100, 15))), "ToAddress"),
	new TemplateField(new TemplateFixedPosition(new Rectangle(new Point(35, 290), new Size(150, 2))), "ToEmail"),

	new TemplateField(new TemplateRegexPosition("Invoice Number"), "InvoiceNumber"),
	new TemplateField(new TemplateLinkedPosition(
		"InvoiceNumber",
		new Size(200, 15),
		new TemplateLinkedPositionEdges(false, false, true, false)),
		"InvoiceNumberValue"),

	new TemplateField(new TemplateRegexPosition("Order Number"), "InvoiceOrder"),
	new TemplateField(new TemplateLinkedPosition(
		"InvoiceOrder",
		new Size(200, 15),
		new TemplateLinkedPositionEdges(false, false, true, false)),
		"InvoiceOrderValue"),

	new TemplateField(new TemplateRegexPosition("Invoice Date"), "InvoiceDate"),
	new TemplateField(new TemplateLinkedPosition(
		"InvoiceDate",
		new Size(200, 15),
		new TemplateLinkedPositionEdges(false, false, true, false)),
		"InvoiceDateValue"),

	new TemplateField(new TemplateRegexPosition("Due Date"), "DueDate"),
	new TemplateField(new TemplateLinkedPosition(
		"DueDate",
		new Size(200, 15),
		new TemplateLinkedPositionEdges(false, false, true, false)),
		"DueDateValue"),

	new TemplateField(new TemplateRegexPosition("Total Due"), "TotalDue"),
	new TemplateField(new TemplateLinkedPosition(
		"TotalDue",
		new Size(200, 15),
		new TemplateLinkedPositionEdges(false, false, true, false)),
		"TotalDueValue"),

	new TemplateTable(detailsTableParameters, "details", null),
	new TemplateTable(summaryTableParameters, "summary", null)
};

// Create a document template
Template template = new Template(templateItems);

ExtractDataFromInvoice.cs

// Create an instance of Parser class
using (Parser parser = new Parser("invoice.pdf"))
{
	// Parse the document by the template
	DocumentData data = parser.ParseByTemplate(template);

	// Print all extracted data
	for (int i = 0; i < data.Count; i++)
	{
		Console.Write(data[i].Name + ": ");
		// Check if the field is a table
		PageTableArea area = data[i].PageArea as PageTableArea;
		if (area == null)
		{
			PageArea pageArea = data[i].PageArea;
			Console.WriteLine(pageArea.ToString());
		}
		else
		{
			// Iterate via table rows
			for (int row = 0; row < area.RowCount; row++)
			{
				// Iterate via table columns
				for (int column = 0; column < area.ColumnCount; column++)
				{
					// Get the cell value
					PageTextArea cellValue = area[row, column].PageArea as PageTextArea;

					// Print the space between columns
					if (column > 0)
					{
						Console.Write("\t");
					}

					// Print the cell value
					Console.Write(cellValue == null ? "" : cellValue.Text);
				}

				// Print new line
				Console.WriteLine();
			}
		}
	}
}