Download document

Question

Right now I'm working with a project there I need to make a download button. All works fine, but I can only click save or save as when I want to download the file, when i click Open, nothing happens, why that?

string path = filePath.ToString();
FileInfo file = new FileInfo(path);
if (file.Exists)
{
    Response.Clear();
    Response.AddHeader("Content-Disposition", "attachment; filename=" + file.Name);
    Response.AddHeader("Content-Length", file.Length.ToString());
    Response.ContentType = "application/msword"; //octet-stream
    Response.WriteFile(file.FullName);
    Response.End();
}

Update * Not working to open only save

private void SetWordDocument()
{
    string strFileName = CleanUp(LabelFirstName.Text + "_" +
                                 LabelLastName.Text + "_" +
                                 DateTime.Now.ToString("yyyy-MM-dd") + "." + 
                                 DropDownListDownloadCv0.SelectedItem.Text);

    object fs = Server.MapPath("~/Upload/") + strFileName;

    using (var db = new knowitCVdbEntities())
    {
        var theEmpl = (from p in db.EMPLOYEES
                       where p.username == strUserName
                       select p).FirstOrDefault();

        if (theEmpl != null)
        {        
            object missing = Missing.Value;
            object start1 = 0;
            var wordApp = new ApplicationClass();
            var myDoc = wordApp.Documents.Add(ref missing, ref missing, ref missing, ref missing);

            object doNotSaveChanges = WdSaveOptions.wdDoNotSaveChanges;
            Range rng = myDoc.Range(ref start1, ref missing);

            try
            {
                const char newLine = (char)11;
                myDoc.SaveAs(ref fs,
                    ref missing, ref missing, ref missing, ref missing, ref missing,
                    ref missing, ref missing, ref missing, ref missing, ref missing,
                    ref missing, ref missing, ref missing, ref missing, ref missing);
            }
            finally
            {

                    myDoc.Save();

                    //myDoc.Close(ref doNotSaveChanges, ref missing, ref missing);
                   wordApp.Quit(ref doNotSaveChanges,ref missing,ref missing);

                   myDoc = null;
                   wordApp = null;

                   System.Runtime.InteropServices.Marshal.ReleaseComObject(myDoc); 

                   System.Runtime.InteropServices.Marshal.ReleaseComObject(wordApp);  



                    GC.Collect();

                System.IO.Stream iStream = null;

                // Buffer to read 10K bytes in chunk:
                byte[] buffer = new Byte[10000];

                // Length of the file:
                int length;

                // Total bytes to read:
                long dataToRead;

                // Identify the file to download including its path.
                string filepath = fs.ToString();

                // Identify the file name.
                string filename = System.IO.Path.GetFileName(filepath);

                try
                {
                    // Open the file.
                    iStream = new System.IO.FileStream(filepath, System.IO.FileMode.Open,
                        System.IO.FileAccess.Read, System.IO.FileShare.Read);

                    // Total bytes to read:
                    dataToRead = iStream.Length;

                    Response.ContentType = "application/msword";
                    Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
                    //application/octet-stream
                    // Read the bytes.
                    while (dataToRead > 0)
                    {
                        // Verify that the client is connected.
                        if (Response.IsClientConnected)
                        {
                            // Read the data in buffer.
                            length = iStream.Read(buffer, 0, 10000);

                            // Write the data to the current output stream.
                            Response.OutputStream.Write(buffer, 0, length);

                            // Flush the data to the HTML output.
                            Response.Flush();

                            buffer = new Byte[10000];
                            dataToRead = dataToRead - length;
                        }
                        else
                        {
                            //prevent infinite loop if user disconnects
                            dataToRead = -1;
                        }
                    }
                }
                catch (Exception ex)
                {
                    // Trap the error, if any.
                    Response.Write("Error : " + ex.Message);
                }
                finally
                {
                    if (iStream != null)
                    {
                        //Close the file.
                        iStream.Close();
                    }
                    Response.Close();
                }

What have I forgotten?

Answer 1

I will remove the line Response.AddHeader("Content-Length", file.Length.ToString());

Please follow rfc2616:

The Content-Length entity-header field indicates the size of the entity-body, in decimal number of OCTETs, sent to the recipient or, in the case of the HEAD method, the size of the entity-body that would have been sent had the request been a GET.

Hope this help.

EDIT:

By the way, you should make sure the filePath variable which using at here already apply Server.MapPath and the file.Name should not contains the white space.

EDIT2:

Base on your comment, actually Response.WriteFile is not a good solution it work slowly and has many problem with large file you can take reference at here . You should apply response stream follow the link below by read file by stream and put it into memory and send back to client as the link below:

How do I put a WebResponse into a memory stream?

or

http://forums.asp.net/t/1794834.aspx/1

EDIT 3:

Your code posted here still not release Ms Word correctly, it still keeping your document so that's reason why you got exception as your comments.

Please follow the link below to resolve your problem.

Disposing of Microsoft.Office.Interop.Word.Application

Or

http://code.msdn.microsoft.com/office/CSAutomateWord-f422cae5