C# 中使用iTextSharp组件修改PDF元数据（title,Keywords等）

引用iTextSharp方法参见：C# 中使用iTextSharp组件创建简单PDF

/// <summary>
/// 修改PDF文件属性
/// </summary>
/// <param name="pdfName">PDF文件名（比如：D:\hello.pdf）</param>
private void PdfPropMod(string pdfName)
{
    try
    {
        PdfReader reader = new PdfReader(File.ReadAllBytes(pdfName));

        if (!reader.IsEncrypted())
        {
            Dictionary<string, string> info = reader.Info;
            info.Remove("Title");
            info.Add("Title", "标题");
            info.Remove("Author");
            info.Add("Author", "作者_幻想Zerow");
            info.Remove("Subject");
            info.Add("Subject", "主题-修改Pdf元数据_幻想Zerow");
            info.Remove("Keywords");
            info.Add("Keywords", "关键字");

            reader.Close();
            PdfStamper stamper = new PdfStamper(reader, new FileStream(pdfName, FileMode.Create, FileAccess.Write));
            stamper.MoreInfo = info;
            //设置是否加密
            //stamper.SetEncryption(PdfWriter.DO_NOT_ENCRYPT_METADATA, null, null, PdfWriter.ALLOW_PRINTING | PdfWriter.ALLOW_COPY);
            stamper.Close();
        }
    }
    catch (Exception e)
    {
        throw e;
    }
}

无加密：