我正在尝试使用iText 7和iText7.pdfHtml库生成PDF并将其写入HTTP响应。
PDF的HTML内容存储在StringBuilder对象中。
不确定执行此操作的正确过程是什么，因为一旦使用HtmlConverter.ConvertToPdf，MemoryStream就关闭了，并且无法访问字节。我收到以下异常：
System.ObjectDisposedException：无法访问关闭的Stream。
HttpResponseMessage httpResponseMessage = new HttpResponseMessage();
StringBuilder htmlText = new StringBuilder();
htmlText.Append("<html><body><h1>Hello World!</h1></body></html>");
using (MemoryStream memoryStream = new MemoryStream())
{
using (PdfWriter pdfWriter = new PdfWriter(memoryStream))
{
PdfDocument pdfDocument = new PdfDocument(pdfWriter);
Document document = new Document(pdfDocument);
string headerText = "my header";
string footerText = "my footer";
pdfDocument.AddEventHandler(PdfDocumentEvent.END_PAGE, new HeaderFooterEventHandler(document, headerText, footerText));
HtmlConverter.ConvertToPdf(htmlText.ToString(), pdfWriter);
memoryStream.Flush();
memoryStream.Seek(0, SeekOrigin.Begin);
byte[] bytes = new byte[memoryStream.Length];
memoryStream.Read(bytes, 0, (int)memoryStream.Length);
Stream stream = new MemoryStream(bytes);
httpResponseMessage.Content = new StreamContent(stream);
httpResponseMessage.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("application/pdf");
httpResponseMessage.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment")
{
FileName = "sample.pdf"
};
httpResponseMessage.StatusCode = HttpStatusCode.OK;
}//end using pdfwriter
}//end using memory stream
编辑添加了PdfDocument和Document对象，以操作页眉/页脚和新页面。
利用您拥有MemoryStream的事实并进行替换
memoryStream.Flush();
memoryStream.Seek(0, SeekOrigin.Begin);
byte[] bytes = new byte[memoryStream.Length];
memoryStream.Read(bytes, 0, (int)memoryStream.Length);
作者
byte[] bytes = memoryStream.ToArray();
该方法也可以在封闭的内存流中使用。