How can I send an Excel file by email?

Question

I have an excel file (Excel 2003 / xls format) and I want to send it by email with c#. My code send it successfully, but when I try to open the response file, it seems to encoded wrongly.

For example here is the response filename:

=_utf-8_B_RWxzesOhbW9sw6FzXzIwMTJfMTBfMTZf.dat

And here is the response file itself:

=?utf-8?B?VEdWdmJIWmhjMkZ1Wk1Pelh6UXlYekZmPz0NCiA9P3V0Zi04P0I/VGtW?=\ \ =?utf-8?B?TlgwZFRXaTU0YkhNPT89?=" Content-Transfer-Encoding: base64 Content-Disposition: attachment

0M8R4KGxGuEAAAAAAAAAAAAAAAAAAAAAPgADAP7/CQAGAAAAAAAAAAAAAAABAAAA AQAAAAAAAAAAEAAAIwAAAAEAAAD+////AAAAAAAAAAD///////////////////// //////////////////////////////////////////////////////////////// ////////////////////////////// ....

Here is my code fragment:

...
var attachment = new Attachment(WriteFileToMemory("fileFullPath"), "fileName.xls");
attachment.ContentType = new ContentType("application/vnd.ms-excel");
attachmentCollection.Add(attachment);
...


private Stream WriteFileToMemory(string filePath)
{
    var memoryStream = new MemoryStream();
    _openedStreams.Add(memoryStream);
    using (var file = new FileStream(filePath, FileMode.Open, FileAccess.Read))
    {
        var bytes = new byte[file.Length];
        file.Read(bytes, 0, (int) file.Length);
        memoryStream.Write(bytes, 0, (int) file.Length);
        file.Close();
    }
    memoryStream.Position = 0;
    return memoryStream;
}

How can I set the attachment encoding type, and which encoding should I use with Excel files?

Please help me solve this problem. Thanks in advance.

Answer 1

You are making it too complex, as @Magnus points out, new Attachment() can handle FileStreams so just pass a new filestream to the constructor.

...
var attachment = new Attachment(File.Open("fileFullPath", FileMode.Open), "fileName.xls");
attachment.ContentType = new ContentType("application/vnd.ms-excel");
attachmentCollection.Add(attachment);
...

A word of warning though, kind is off topic, you cannot send a mail like that multiple times since the stream will not always reset itself properly.