How to set attachment name to display correctly in Outlook

Question

I am creating an MIME attachment from the BizTalk 2016 SMTP send port. However, I think that any knowledge anyone can share with any other language about the oddities of Outlook and MIME can help me fix the problem below.

In Outlook, the attachment appears as body.txt, but when I click "Save File", it shows the name that I used to create it (and what the user wants to see).

What I mean is the left side where it says “body.txt” over 5k and to the right of the attachment icon in the screenshot below:

BizTalk # Pipeline , BizTalk Message. ContentHeader ContentID.

strFilename = "MyFileName_693.txt";  // Just for example. 
pInMsg.BodyPart.PartProperties.Write(
              "FileName",
              "http://schemas.microsoft.com/BizTalk/2003/mime-properties",
               strFilename);

Gmail, . , Outlook (2016).

Answer 1

. - , . SMTP-, BizTalk 2013R2.

. , , -, , .

, , :

------=_NextPart_000_0001_01D4502F.8A6A1500
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="utf-8"

See attached email.
------=_NextPart_000_0001_01D4502F.8A6A1500
Content-Type: application/pdf; name="CDM_Order - Copy.pdf"
Content-Disposition: attachment; filename="CDM_Order - Copy.pdf"
Content-Description: body
Content-Transfer-Encoding: base64

JVBERi0xLjQKJeLjz9MNCjUgMCBvYmoKPDwvRFsgMyAwIFIvWFlaIG51bGwgODQxLjg4OTc3IG51
bGwgXQo+PgplbmRvYmoKOCAwIG9iago8PC9EWyAzIDAgUi9YWVogbnVsbCAyOTAuMjM2NTcgbnVs
bCBdCj4+ (etc etc base64 your file)...

Content-Description: body. body.xml body.pdf, Disposition : Content-Disposition: attachment; filename="CDM_Order - Copy.pdf" Content-Disposition: attachment; filename="CDM_Order - Copy.pdf".

MIME.FileName , Content-Disposition, Content-Description. , Attach only body part 1 .

Attach all parts 2 MessagePartsAttachments. . ;

• - BodyPart, , . , Message Body Part Message Type.
• , . Attachment.

, BodyPart , , . Attach all parts. , , , BodyPart RawString, BizTalk. # .

, RawString, SMTP . SMTP Content-Description: body , . :

------=_NextPart_000_0001_01D450E4.A7E9A5E0
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset="utf-8"
Content-Description: body

See attached email.
------=_NextPart_000_0001_01D450E4.A7E9A5E0
Content-Type: application/pdf; name="ID_0_Nummer_0.pdf"
Content-Disposition: attachment; filename="ID_0_Nummer_0.pdf"
Content-Transfer-Encoding: base64

JVBERi0xLjQKJeLjz9MNCjUgMCBvYmoKPDwvRFsgMyAwIFIvWFlaIG51bGwgODQxLjg4OTc3IG51
bGwgXQo+PgplbmRvYmoKOCAwIG9iago8PC9EWyAzIDAgUi9YWVogbnVsbCAyOTAuMjM2NTcgbnVs
bCBdCj4+ (etc etc base64 your file)...

, Content-Description: body, , . .

, , , , :

:

MsgPdfOrder.BodyPart(Microsoft.XLANGs.BaseTypes.ContentType) = "text/plain";

:

MsgPdfOrder.Attachment(Microsoft.XLANGs.BaseTypes.ContentType) = "application/pdf";

:

MsgPdfOrder.Attachment(MIME.FileName) =  "CDM_Order - Copy.pdf"

( Unknown Error Description ):

MsgPdfOrder(SMTP.EmailBodyTextCharset) = "UTF-8";

, SMTP.EmailBodyText BodyPart.

RawString, , MsgPdfOrder.BodyPart = new Yournamespace.Components.RawString("See attached email."); :

using System.Runtime.Serialization;
using System;
using System.IO;
using System.Text;
using System.Xml.Serialization;
using Microsoft.XLANGs.BaseTypes;

namespace Yournamespace.Components
{
    public abstract class BaseFormatter : IFormatter
    {
        public virtual SerializationBinder Binder
        {
            get { throw new NotSupportedException(); }
            set { throw new NotSupportedException(); }
        }

        public virtual StreamingContext Context
        {
            get { throw new NotSupportedException(); }
            set { throw new NotSupportedException(); }
        }

        public virtual ISurrogateSelector SurrogateSelector
        {
            get { throw new NotSupportedException(); }
            set { throw new NotSupportedException(); }
        }

        public abstract void Serialize(Stream stm, object obj);
        public abstract object Deserialize(Stream stm);
    }

    public class RawStringFormatter : BaseFormatter
    {
        public override void Serialize(Stream s, object o)
        {
            RawString rs = (RawString)o;
            byte[] ba = rs.ToByteArray();
            s.Write(ba, 0, ba.Length);
        }

        public override object Deserialize(Stream stm)
        {
            StreamReader sr = new StreamReader(stm, true);
            string s = sr.ReadToEnd();
            return new RawString(s);
        }
    }

    [CustomFormatter(typeof(RawStringFormatter))]
    [Serializable]
    public class RawString
    {
        [XmlIgnore]
        string _val;

        public RawString(string s)
        {
            if (null == s)
                throw new ArgumentNullException();
            _val = s;
        }

        public RawString()
        {
        }

        public byte[] ToByteArray()
        {
            return Encoding.UTF8.GetBytes(_val);
        }

        public override string ToString()
        {
            return _val;
        }
    }
}