Formulate function to set an email recipient based on the current page.

SetEmailByPage.cs

/// <summary>
/// Sets the "Dynamic Email Recipient" field based on the current page.
/// </summary>
/// <param name="context">
/// The form submission context.
/// </param>
private static void SetEmailByPage(FormSubmissionContext context)
{

	// Find the "Dynamic Email Recipient" field (exit early if not found).
	var field = context.Form.Fields
		.Where(x => x.Category == "Dynamic Email Recipient")
		.FirstOrDefault();
	if (field == null)
	{
		return;
	}

	// Get the recipient email address from the current page.
	var recipient = context.CurrentPage.GetPropertyValue<string>("emailRecipient");

	// Copy the field data into a new list.
	var newData = new List<FieldSubmission>(context.Data);

	// Set field data to the email address.
	MergeFieldData(newData, field, recipient);

	// Ensure the modified field data gets used.
	context.Data = newData;

}