Aspose.Email FOSS
.NET
Hur man konverterar EML till MSG i C#

Hur man konverterar EML till MSG i C#

Denna guide visar hur man konverterar mellan EML (RFC 5322 / MIME) och Outlook MSG‑format med Aspose.Email FOSS för .NET.

Steg 1 — Installera paketet 

dotnet add package Aspose.Email.Foss

Steg 2 — Konvertera EML till MSG 

using Aspose.Email.Foss.Msg;

var message = MapiMessage.LoadFromEml("incoming.eml");
message.Save("converted.msg");

Du kan också läsa in från en stream eller byte array:

// From stream
using var stream = File.OpenRead("incoming.eml");
var message = MapiMessage.LoadFromEml(stream);
message.Save("converted.msg");

// From byte array
var emlData = File.ReadAllBytes("incoming.eml");
var message2 = MapiMessage.LoadFromEml(emlData);
message2.Save("converted.msg");

Steg 3 — Konvertera MSG till EML 

using var message = MapiMessage.FromFile("original.msg");

// To file
message.SaveToEml("exported.eml");

// To byte array
byte[] emlBytes = message.SaveToEml();

Steg 4 — Verifiera rundresans trohet

Ämne, meddelandetext, avsändare, mottagare och bilagor överlever rundresan:

// EML → MSG → EML
var original = MapiMessage.LoadFromEml("test.eml");
original.Save("test.msg");

using var reloaded = MapiMessage.FromFile("test.msg");
reloaded.SaveToEml("roundtrip.eml");

Console.WriteLine($"Subject match: {original.Subject == reloaded.Subject}");
Console.WriteLine($"Attachments match: {original.Attachments.Count == reloaded.Attachments.Count}");

Batchkonverteringsexempel

Konvertera alla .eml-filer i en katalog till .msg:

using Aspose.Email.Foss.Msg;

foreach (var emlFile in Directory.GetFiles("inbox", "*.eml"))
{
    var message = MapiMessage.LoadFromEml(emlFile);
    var msgFile = Path.ChangeExtension(emlFile, ".msg");
    message.Save(msgFile);
    Console.WriteLine($"Converted: {emlFile} → {msgFile}");
}
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