是否可以通过编程方式重命名 Outlook 类别？

Question

我们正在开发 Outlook 2007 加载项。为了测试 Outlook 类别重命名，我已将以下代码块添加

 var session = Application.Session;
 var categories = session.Categories;
 var category1 = session.Categories[1];

 //catefory1.Name is "Group1" before executing line below
 category1.Name = "TEST!!!";

 Marshal.ReleaseComObject(category1);
 Marshal.ReleaseComObject(categories);
 Marshal.ReleaseComObject(session);

到加载项 private void ThisAddIn_Startup(object sender, EventArgs e) 方法的末尾。 类别已重命名，但如果 Outlook 关闭，以上行将被注释，并再次启动 Outlook - 类别名称不是“TEST!!!”正如我所料。它是重命名之前的“Group1”。是否可以通过代码将 Outlook 类别重命名为“永远”？ Microsoft.Office.Interop.Outlook.Category 没有 Save() 或 Update() 或 Persist() 方法。

PS 我们正在使用 Visual Studio 2008、.net 3.5、C# 3 开发 Outlook 2007 加载项。 Outlook 2007 SP1 和 SP2 会重现该问题。其他 Outlook 版本未测试。

Answer 1

我已经使用 hack 解决了这个问题（问题本身似乎是 Outlook 2007 bug）。
以下链接帮助我创建了黑客（哎呀，没有足够的声誉来发布超过 1 个链接）：

• http://blogs.officezealot.com/legault/archive/2009/08/13/21577.aspx
• http:// www.officekb.com/Uwe/Forum.aspx/outlook-prog-addins/3142/Apply-Categories-to-other-users-Outlook-2007
• http://help.wugnet.com/office/set -master-category-list-Outlook-2007-ftopict1095935.html
• http://forums.slipstick.com/showthread.php?t=18189
• http://msdn.microsoft.com/en-us/library/ee203806%28EXCHG .80%29.aspx

黑客本身如下所示：

using System;
using System.Text;
using System.Xml;
using System.IO;
using Microsoft.Office.Interop.Outlook;

namespace OutlookHack
{
    public static class OutlookCategoryHelper
    {
        private const string CategoryListStorageItemIdentifier = "IPM.Configuration.CategoryList";
        private const string CategoryListPropertySchemaName = @"http://schemas.microsoft.com/mapi/proptag/0x7C080102";
        private const string CategoriesXmlElementNamespace = "CategoryList.xsd";
        private const string XmlNamespaceAttribute = "xmlns";
        private const string CategoryElement = "category";
        private const string NameAttribute = "name";

        public static void RenameCategory(string oldName, string newName, Application outlookApplication)
        {
            MAPIFolder calendarFolder = outlookApplication.Session.GetDefaultFolder(
                OlDefaultFolders.olFolderCalendar);
            StorageItem categoryListStorageItem = calendarFolder.GetStorage(
                CategoryListStorageItemIdentifier, OlStorageIdentifierType.olIdentifyByMessageClass);

            if (categoryListStorageItem != null)
            {
                PropertyAccessor categoryListPropertyAccessor = categoryListStorageItem.PropertyAccessor;
                string schemaName = CategoryListPropertySchemaName;
                try
                {
                    // next statement raises Out of Memory error if property is too big
                    var xmlBytes = (byte[])categoryListPropertyAccessor.GetProperty(schemaName);

                    // the byte array has to be translated into a string and then the XML has to be parsed
                    var xmlReader = XmlReader.Create(new StringReader(Encoding.UTF8.GetString(xmlBytes)));

                    // xmlWriter will write new category list xml with renamed category
                    XmlWriterSettings settings = new XmlWriterSettings { Indent = true, IndentChars = ("\t") };
                    var stringWriter = new StringWriter();
                    var xmlWriter = XmlWriter.Create(stringWriter, settings);

                    xmlReader.Read(); // read xml declaration
                    xmlWriter.WriteNode(xmlReader, true);
                    xmlReader.Read(); // read categories
                    xmlWriter.WriteStartElement(xmlReader.Name, CategoriesXmlElementNamespace);
                    while (xmlReader.MoveToNextAttribute())
                    {
                        if (xmlReader.Name != XmlNamespaceAttribute) // skip namespace attr
                        {
                            xmlWriter.WriteAttributeString(xmlReader.Name, xmlReader.Value);
                        }
                    }
                    while (xmlReader.Read())
                    {
                        switch (xmlReader.NodeType)
                        {
                            case XmlNodeType.Element: // read category
                                xmlWriter.WriteStartElement(CategoryElement);
                                while (xmlReader.MoveToNextAttribute())
                                {
                                    if ((xmlReader.Name == NameAttribute) && (xmlReader.Value == oldName))
                                    {
                                        xmlWriter.WriteAttributeString(NameAttribute, newName);
                                    }
                                    else
                                    {
                                        xmlWriter.WriteAttributeString(xmlReader.Name, xmlReader.Value);
                                    }
                                }
                                xmlWriter.WriteEndElement();
                                break;
                            case XmlNodeType.EndElement: // categories ended
                                xmlWriter.WriteEndElement();
                                break;
                        }
                    }
                    xmlReader.Close();
                    xmlWriter.Close();

                    xmlBytes = Encoding.UTF8.GetBytes(stringWriter.ToString());
                    categoryListPropertyAccessor.SetProperty(schemaName, xmlBytes);
                    categoryListStorageItem.Save();
                }
                catch (OutOfMemoryException)
                {
                    // if error is "out of memory error" then the XML blob was too big
                }
            }
        }
    }
}

必须在类别重命名之前调用此辅助方法，例如：

 var session = Application.Session;
 var categories = session.Categories;
 var category1 = session.Categories[1];

 //catefory1.Name is "Group1" before executing line below
 OutlookCategoryHelper.RenameCategory(category1.Name, "TEST!!!", Application);
 category1.Name = "TEST!!!";

 Marshal.ReleaseComObject(category1);
 Marshal.ReleaseComObject(categories);
 Marshal.ReleaseComObject(session);

Answer 2

这是 Outlook 2007 SP2 中引入的 Outlook 错误。

“考虑以下场景。您有一个自定义应用程序，可以运行该应用程序在 Outlook 2007 中创建新类别。
您运行该应用程序在 Outlook 2007 中创建一个新类别。然后，如果您重新启动 Outlook 2007，您创建的类别将被意外删除。安装二月累积更新或 SP2 后会出现此问题。”

自 2009 年 6 月 30 日起有一个修补程序可用：
http://support.microsoft.com/default.aspx/kb/970944/ en

问候，
蒂姆