Word: Word-Dokument automatisch in HTML umwandeln

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// using System.Reflection; nicht vergessen!

/// <summary>
/// Wandelt ein bestimmtes Word-Dokument in HTML um.
/// </summary>
/// <param name="source">Quelldokument</param>
/// <param name="destination">Zieldokument</param>
public static void ConvertWord2Html(string source, string destination)
{ 
    // Konstante für Word-HTML-Ausgabeformat
    const int WORD_HTML_FORMAT=8;                  

    // COM-Metadaten von Word.Application aus der Registry laden
    Type wordApplication=Type.GetTypeFromProgID("Word.Application");

    // Neue Instanz von Word erzeugen
    object word = Activator.CreateInstance(wordApplication);

    // Word sichtbar machen (Visible=true)
    //wordApplication.InvokeMember("Visible",BindingFlags.IgnoreCase | BindingFlags.SetProperty | BindingFlags.Public,null,word,new object[1]{true});

    // Dokumentauflistung abrufen
    object documents = wordApplication.InvokeMember("Documents", BindingFlags.IgnoreCase | BindingFlags.GetProperty | BindingFlags.Public, null, word, new object[0]);

    // COM-Metadaten von Word.Documents ermitteln
    Type wordDocuments = documents.GetType();

    // Quelldokument laden
    object document=wordDocuments.InvokeMember("Open", BindingFlags.IgnoreCase | BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.OptionalParamBinding, null, documents, new object[1] {source});

     // COM-Metadaten von Word.Document ermitteln
    Type wordDocument = document.GetType();

    // HTML erzeugen
    wordDocument.InvokeMember("SaveAs", BindingFlags.IgnoreCase | BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.OptionalParamBinding, null, document, new object[2] {destination,WORD_HTML_FORMAT});

    // Word schließen
    wordApplication.InvokeMember("Quit", BindingFlags.IgnoreCase | BindingFlags.InvokeMethod | BindingFlags.Public | BindingFlags.OptionalParamBinding, null, word, new object[0]);
}