c# - 使用密码 C# 保护 pdf 文件

Question

connetionString = ConfigurationManager.ConnectionStrings["conString"].ToString();
sql = "select Id,employeeName,employeePosition from Employee";
connection = new SqlConnection(connetionString);
connection.Open();
command = new SqlCommand(sql, connection);
adapter.SelectCommand = command;
adapter.Fill(ds);
connection.Close();

PdfDocument pdf = new PdfDocument();
pdf.Info.Title = "Database to PDF";
PdfPage pdfPage = pdf.AddPage();
XGraphics graph = XGraphics.FromPdfPage(pdfPage);
XFont font = new XFont("Verdana", 20, XFontStyle.Regular);

yPoint = yPoint + 100;

for (i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
    pubname = ds.Tables[0].Rows[i].ItemArray[0].ToString();
    city = ds.Tables[0].Rows[i].ItemArray[1].ToString();
    state = ds.Tables[0].Rows[i].ItemArray[2].ToString();
    graph.DrawString(pubname, font, XBrushes.Black, new XRect(40, yPoint, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);
    graph.DrawString(city, font, XBrushes.Black, new XRect(120, yPoint, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);
    graph.DrawString(state, font, XBrushes.Black, new XRect(400, yPoint, pdfPage.Width.Point, pdfPage.Height.Point), XStringFormats.TopLeft);
    yPoint = yPoint + 40;
}

string pdfFilename = "dbtopdf.pdf";
pdf.Save(pdfFilename);

我直接从数据库创建了一个pdf文件。我需要用密码保护 pdf 文件。

using (MemoryStream ObjememoryStream = new MemoryStream())
{
    PdfWriter.GetInstance(pdfDoc, ObjememoryStream);
    pdfDoc.Open();
    htmlworker.Parse(sr);
    pdfDoc.Close();
    byte[] Filebytes = ObjememoryStream.ToArray();
    ObjememoryStream.Close();
    using (MemoryStream inputData = new MemoryStream(Filebytes))
    {
        using (MemoryStream outputData = new MemoryStream())
        {
            string PDFFileword = txtPassword.Text;//you can also generate Dynamic word  
            PdfReader reader = new PdfReader(inputData);
            PdfEncryptor.Encrypt(reader, outputData, true, PDFFileword, PDFFileword, PdfWriter.ALLOW_SCREENREADERS);
            Filebytes = outputData.ToArray();
            File.WriteAllBytes(destPath, Filebytes);
            //Response.ContentType = "application/pdf";
            //Response.AddHeader("content-disposition", "attachment;filename=GridViewExport.pdf");
            //Response.Cache.SetCacheability(HttpCacheability.NoCache);
            //Response.BinaryWrite(Filebytes);
            //Response.End();
            GridView1.AllowPaging = true;
            GridView1.DataBind();
        }
    }
}

我设法用上面的代码用密码保护了 pdf 文件，但它只适用于从 gridview 生成的 pdf 文件。有人可以告诉我如何使用类似于我的第二个代码的方法使用第一种方法生成的密码来保护 pdf 文件吗？

Answer 1

在SecuritySettings中设置用户密码

pdf.SecuritySettings.UserPassword = "your password";