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PdfReader pdfReader = new PdfReader(fileName);//读取PDF文档中内容
for (int page = 1; page <= pdfReader.NumberOfPages; page++)
{
//这几句不太理解
ITextExtractionStrategy strategy = new SimpleTextExtractionStrategy();
string currentText = PdfTextExtractor.GetTextFromPage(pdfReader, page, strategy);
//解释以上两句
currentText = Encoding.UTF8.GetString(ASCIIEncoding.Convert(Encoding.Default, Encoding.UTF8, Encoding.Default.GetBytes(currentText)));//转换编码,读取文本内容