wie kann ich das öffnen von pdf generiert von Berichts-viewer in einem neuen tab?

ich habe Antwort

1. Zunächst Müssen Sie erstellen pdf-Datei aus dem report viewer und Speichern Sie es
   irgendwo auf dem server
2. speichern Sie die Datei in eindeutiger name
3. Danach verwenden Sie file-stream zum schreiben von bytes in eine pdf-Datei auf Ihrem server-Pfad
4. Pfad den Namen der Datei mit Hilfe von query-string neue Seite

5. in der Page_Load-qet die pdf-Datei Namen von query-string, und öffnen Sie es

   protected void Print_Click(object sender, EventArgs e)
   {
   Warning[] warnings;
   string[] streamIds;
   string mimeType = string.Empty;
   string encoding = string.Empty;
   string extension = string.Empty;
   string devinfo = "<DeviceInfo><ColorDepth>32</ColorDepth><DpiX>350</DpiX><DpiY>350</DpiY><OutputFormat>PDF</OutputFormat>" +
          "  <PageWidth>8.5in</PageWidth>" +
           "  <PageHeight>11in</PageHeight>" +
           "  <MarginTop>0.5in</MarginTop>" +
           "  <MarginLeft>0.5in</MarginLeft>" +
            "  <MarginRight>0in</MarginRight>" +
            "  <MarginBottom>0in</MarginBottom>" +
          "</DeviceInfo>";
   
   //Setup the report viewer object and get the array of bytes
   ReportViewer viewer = new ReportViewer();
   viewer.ProcessingMode = ProcessingMode.Local;
   viewer.LocalReport.ReportPath = Server.MapPath("~/Installments_Report.rdlc");
   DataView dv = new DataView();
   DataTable dt = new DataTable();
   dv = (System.Data.DataView)SqlDataSource1.Select(System.Web.UI.DataSourceSelectArguments.Empty);
   dt = dv.ToTable();
   viewer.LocalReport.DataSources.Add(new ReportDataSource("DataSet1", dt));
   
   byte[] bytes = viewer.LocalReport.Render("PDF", devinfo, out mimeType, out encoding, out extension, out streamIds, out warnings);
   //Now that you have all the bytes representing the PDF report, buffer it and send it to the client.
   string path =Server.MapPath("Print_Files") ;
   Random rnd = new Random();
   int month = rnd.Next(1, 13); //creates a number between 1 and 12
   int dice = rnd.Next(1, 7); //creates a number between 1 and 6
   int card = rnd.Next(9); //creates a number between 0 and 51
   string file_name = "Installments" + "List" + month+dice+card+".pdf"; //save the file in unique name 
   
   //3. After that use file stream to write from bytes to pdf file on your server path
   
   FileStream file = new FileStream(path + "/" + file_name, FileMode.OpenOrCreate, FileAccess.ReadWrite);
   file.Write(bytes, 0, bytes.Length);
   file.Dispose();
   
   //4.path the file name by using query string to new page 
   
   Response.Write(string.Format("<script>window.open('{0}','_blank');</script>", "Print.aspx?file="+file_name));
    }

in Page_Load qet die pdf-Datei Namen von query-string, und Öffnen Sie die PDF-Datei im Web-Browser

    protected void Page_Load(object sender, EventArgs e)
      {
    string file_name = Request.QueryString["file"];
    string path = Server.MapPath("Print_Files/"+file_name);

    //Open PDF File in Web Browser 

    WebClient client = new WebClient();
    Byte[] buffer = client.DownloadData(path);
    if (buffer != null)
    {
        Response.ContentType = "application/pdf";
        Response.AddHeader("content-length", buffer.Length.ToString());
        Response.BinaryWrite(buffer);
    }
 }

Gemacht !!!
hoffe, dieser code jemandem helfen zu können 🙂
Danke!!!