[英]itextsharp “Object reference not set to an instance of an object” error
I have the following code. 我有以下代码。 In my dev enviroment I am not getting any erros but in my production enviroment I do.
在我的开发环境中,我没有遇到任何错误,但是在生产环境中,我却得到了。
...
private Document _pdf;
public Report()
{
_pdf = new Document();
}
public string GenerateReport(string reportType) {
try {
var fs = new FileStream("C:\\myfile.pdf", FileMode.Create);
_pdfWriter = PdfWriter.GetInstance(_pdf, fs);
...
When the code run's I am getting the following error on _pdfWriter = PdfWriter.GetInstance(_pdf, fs); 当代码运行时,我在_pdfWriter = PdfWriter.GetInstance(_pdf,fs);上收到以下错误; :
:
Object reference not set to an instance of an object.
at iTextSharp.text.pdf.PdfWriter.GetInstance(Document document, Stream os)
at Report.GenerateReport(String reportType)
Why do you think I am getting ths error? 为什么您认为我遇到了错误? The filestream has been created and the _pdf is set in the constructor.
已创建文件流,并在构造函数中设置了_pdf。
Update 更新资料
The problem is the _pdf is null. 问题是_pdf为空。 I am not sure why it is null as set in the constructor.
我不确定为什么它在构造函数中设置为null。 I can get round this problem by doing:
我可以通过以下方法解决此问题:
if (_pdf == null) {
_pdf = new Document();
}
_pdfWriter = PdfWriter.GetInstance(_pdf, fs);
I would still like to know what I am doing wrong... 我仍然想知道我在做什么错...
该问题与生产中的超时问题有关,因为有更多数据。
当我打开所有例外时,我遇到了同样的问题,但是您可以继续解决该例外。
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