We must replace some of the attachments of an msg. When we remove and insert a new msg attachment to an msg, we find no way to set the DisplayName of the attachment, the final msg has an attachment with the DisplayName equal to the FileName. Can you help us change the DisplayName of a replaced attachment?
Snippet: to read the original DisplayName from the container msg
string longFileName;
string displayName;
using var msgFileStream = File.OpenRead(path);
using (MapiMessage message = MapiMessage.Load(msgFileStream))
{
MapiAttachment mapiAttachment = message.Attachments[0];
longFileName = mapiAttachment.LongFileName;
displayName = mapiAttachment.DisplayName;
}
Snippet: to replace the contained msg attachment
using (MailMessage message = MailMessage.Load(msgFileStream))
{
var replacementContent = Stream.Null;//Stream with content to replace
using var replacementAttachment = new Aspose.Email.Attachment(replacementContent, Path.GetFileName(longFileName));
**[//replacementAttachment.DisplayName](https://replacementattachment.displayname/) = displayName;//āAttachmentā does not contain a definition for 'DisplayNameā**
message.Attachments.RemoveAt(0);
message.Attachments.Insert(0, replacementAttachment);
}
If we add it as a MapiMessage, the DisplayName is readonly.
Thanks for your help!
@Macarea_Dabbah
Could you please ZIP and attach your input and expected output message files here for our reference? We will then provide you more information on it.
@tahir.manzoor thanks for the prompt response!
To reproduce this issue you can follow the steps below:
-
Create with Outlook a new email file. Subject āAttached email subjectā. Save the message as "Attached_email_subject.msg"
-
Create with Outlook a new email. Attach the file āAttached_email_subject.msgā. Save the message as "container_email.msg"
-
Run this code snippet
// Original File
using var originalMsgFileStream = File.OpenRead(Path.Join(path, "container_email.msg"));
using (MapiMessage originalMessage = MapiMessage.Load(originalMsgFileStream))
{
Console.WriteLine($"Original DisplayName: {originalMessage.Attachments[0].DisplayName}");
Console.WriteLine($"Original LongFileName: {originalMessage.Attachments[0].LongFileName}");
}
// Replace attachment contents
var afterReplacementFileName = Path.Join(path, "container_email_after_replacement.msg");
using (MailMessage message = MailMessage.Load(originalMsgFileStream))
{
var replacementContent = Path.Join(path, "replacement_email.msg");
using var replacementAttachment = new Aspose.Email.Attachment(replacementContent, Path.GetFileName(replacementContent));
//replacementAttachment.DisplayName = displayName;//'Attachment' does not contain a definition for 'DisplayName'
message.Attachments.RemoveAt(0);
message.Attachments.Insert(0, replacementAttachment);
Console.WriteLine($"While replacing Name {message.Attachments[0].Name}");
using (var outs = new MemoryStream())
{
message.Save(outs, SaveOptions.CreateSaveOptions(MailMessageSaveType.OutlookMessageFormat));
File.WriteAllBytes(afterReplacementFileName, outs.ToArray());
}
}
// Parse the replaced file
using var afterReplacementFileStream = File.OpenRead(afterReplacementFileName);
using (MapiMessage message = MapiMessage.Load(afterReplacementFileStream))
{
Console.WriteLine($"After replacement DisplayName: {message.Attachments[0].DisplayName}");
Console.WriteLine($"After replacement LongFileName: {message.Attachments[0].LongFileName}");
}
You will get the following output:
Original DisplayName: Attached email subject
Original LongFileName: Attached_email_subject.msg
While replacing Name replacement_email.msg
After replacement DisplayName: **replacement_email.msg**
After replacement LongFileName: replacement_email.msg
The desired output is:
Original DisplayName: Attached email subject
Original LongFileName: Attached_email_subject.msg
While replacing Name replacement_email.msg
After replacement DisplayName: replacement email
After replacement LongFileName: replacement_email.msg
- Open the replacement_email.msg. You will see the attachment display name to be āreplacement_email.msgā instead of āreplacement emailā.
Here are some screenshots:
@Macarea_Dabbah
You can use Attachment.Name property as shown below to get the desired output.
replacementAttachment.Name = "New display name of attachment.msg";
@tahir.manzoor the proposed solution has side effects: the filename of the attachment is modified, it is the exact same as the āNameā we set; the final email has an attachment with a filename that has no extension. We need to only modify the DisplayName (and keep the original the FileName). The proposal may also have more side effects: if the attachment is an email, the email subject may contain invalid path characters and when saving, it will have issues. Please find below the evidences.
Code snippet:
// Original File
using var originalMsgFileStream = File.OpenRead(Path.Join(path, ācontainer_email.msgā));
using (MapiMessage originalMessage = MapiMessage.Load(originalMsgFileStream))
{
Console.WriteLine($āOriginal DisplayName: {originalMessage.Attachments[0].DisplayName}ā);
Console.WriteLine($āOriginal LongFileName: {originalMessage.Attachments[0].LongFileName}ā);
}
// Replace attachment contents
var afterReplacementFileName = Path.Join(path, "container_email_after_replacement.msg");
using (MailMessage message = MailMessage.Load(originalMsgFileStream))
{
var replacementContent = Path.Join(path, "replacement_email.msg");
using var replacementAttachment = new Aspose.Email.Attachment(replacementContent, Path.GetFileName(replacementContent));
//replacementAttachment.DisplayName = displayName;//'Attachment' does not contain a definition for 'DisplayName'
replacementAttachment.Name = "Some fantastic display name";
message.Attachments.RemoveAt(0);
message.Attachments.Insert(0, replacementAttachment);
Console.WriteLine($"While replacing Name {message.Attachments[0].Name}");
using (var outs = new MemoryStream())
{
message.Save(outs, SaveOptions.CreateSaveOptions(MailMessageSaveType.OutlookMessageFormat));
File.WriteAllBytes(afterReplacementFileName, outs.ToArray());
}
}
// Parse the replaced file
using var afterReplacementFileStream = File.OpenRead(afterReplacementFileName);
using (MapiMessage message = MapiMessage.Load(afterReplacementFileStream))
{
Console.WriteLine($"After replacement DisplayName: {message.Attachments[0].DisplayName}");
Console.WriteLine($"After replacement LongFileName: {message.Attachments[0].LongFileName}");
}
Output:
Original DisplayName: Attached email subject
Original LongFileName: Attached email subject.msg
While replacing Name Some fantastic display name
After replacement DisplayName: Some fantastic display name
After replacement LongFileName: **Some fantastic display name**
Thanks for your help!
@Macarea_Dabbah
We have logged this problem in our issue tracking system as EMAILNET-40735. We will inform you once there is an update available on it.
We apologize for your inconvenience.
thanks @tahir.manzoor! Looking forward to a fix 
@Macarea_Dabbah
We have added MapiAttacment.DisplayName property in Aspose.Email APIs. This feature will be available in Aspose.Email for .NET 22.10. We will inform you once it is released.
MapiMessage msg = MapiMessage.Load(fileName);
msg.Attachments[0].DisplayName = "New display name 1";
msg.Attachments[1].DisplayName = "New display name 2";
1 Like
Thatās fantastic, thanks!