打开一个新的窗口 Codebehind ASP.net

Question

I have the following code:

protected void Page_Load(object sender, EventArgs e)
{
        byte[] buffer = null;
        buffer = File.ReadAllBytes("C:\\myfile.pdf");
        HttpContext.Current.Response.ContentType = "application/pdf";
        HttpContext.Current.Response.OutputStream.Write(buffer, 0, buffer.Length);
        HttpContext.Current.Response.End();
}

I want to open a second window for the pfd file beside the current page, where the pageload comes from.

Answer 1

There is no way to open a new window from a codebehind file. The link to the page on which this Page_Load event is being fired must have the target="_blank" attribute to open it in a new window. For example:

<a href="DownloadPdf.aspx" target="_blank">Download PDF<a>

On a side note, if this is the only function of your ASPX file, you may want to consider using an HttpHandler instead.

Answer 2

In order to do this you'll need to upload the PDF to a path in the application where it can be presented to the user, then register some javascript to open the PDF in a new window:

protected void Page_Load(object sender, EventArgs e)
{
    byte[] buffer = null;
    buffer = File.ReadAllBytes("C:\\myfile.pdf");
    //save file to somewhere on server, for example in a folder called PDFs inside your application's root folder
    string newFilepath = Server.MapPath("~/PDFs/uploadedPDF.pdf");
    System.IO.FileStream savedPDF = File.Create(newFilepath);
    file.Write(buffer, 0, buffer.Length);
    file.Close();

    //register some javascript to open the new window
    Page.ClientScript.RegisterStartupScript(this.GetType(), "OpenPDFScript", "window.open(\"/PDFs/uploadedPDF.pdf\");", true);
}

Answer 3

You can't do this from the response.

If you have control of the hyperlink that leads to this page load, you can give it an attrbute target="_blank" , which will ask the browser to open that link in a new window.