今天没事，看到一个用C#开发OutLook插件的例子，顺便自己做了一个

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用C#开发OutLook插件
引言：
我们可以用VS.Net 2003开发OutLook插件，把自己的代码集成到OutLook中去。比如说我们可以在简单做一个邮件的统计功能。
软件原理：
利用C#调用Office的接口
代码实现：
1． 我们新建一个addin项目

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这样我们根据.net的向导就自动生成了插件项目。
2． 如果你的应用程序中没有自动引用Microsoft.Office.Interop.Outlook.dll，那么我们手工来添加Microsoft.Office.Interop.Outlook.dll到引用中
3． 最终的界面：

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Connect.cs最后的代码：
namespace EmailSum
{
using System;
using Microsoft.Office.Core;
using Extensibility;
using System.Runtime.InteropServices;
using Microsoft.Office.Interop.Outlook;
  　　
　　#region Read me for Add-in installation and setup information.
// When run, the Add-in wizard prepared the registry for the Add-in.
// At a later time, if the Add-in becomes unavailable for reasons such as:
//   1) You moved this project to a computer other than which is was originally created on.
//   2) You chose 'Yes' when presented with a message asking if you wish to remove the Add-in.
//   3) Registry corruption.
// you will need to re-register the Add-in by building the MyAddin21Setup project
// by right clicking the project in the Solution Explorer, then choosing install.
#endregion

/// <summary>
///   The object for implementing an Add-in.
/// </summary>
/// <seealso class='IDTExtensibility2' />
[GuidAttribute("0E0C25E6-C16B-44F6-BEAA-192F86765DE8"), ProgId("EmailSum.Connect")]
public class Connect : Object, Extensibility.IDTExtensibility2
{
  private Microsoft.Office.Interop.Outlook.Application
   applicationObject;     
  private object addInInstance;
  private CommandBarButton btnGetEMailStats;
　　/// <summary>
  ///  Implements the constructor for the Add-in object.
  ///  Place your initialization code within this method.
  /// </summary>
  public Connect()
  {
  }
　　/// <summary>
  ///      Implements the OnConnection method of the IDTExtensibility2 interface.
  ///      Receives notification that the Add-in is being loaded.
  /// </summary>
  /// <param term='application'>
  ///      Root object of the host application.
  /// </param>
  /// <param term='connectMode'>
  ///      Describes how the Add-in is being loaded.
  /// </param>
  /// <param term='addInInst'>
  ///      Object representing this Add-in.
  /// </param>
  /// <seealso class='IDTExtensibility2' />
  public void OnConnection(object application, Extensibility.ext_ConnectMode connectMode, object addInInst, ref System.Array custom)
  {
   
   
   applicationObject = (Microsoft.Office.Interop.Outlook.Application)
    application;
   addInInstance = addInInst;
  }
　　/// <summary>
  ///     Implements the OnDisconnection method of the IDTExtensibility2 interface.
  ///     Receives notification that the Add-in is being unloaded.
  /// </summary>
  /// <param term='disconnectMode'>
  ///      Describes how the Add-in is being unloaded.
  /// </param>
  /// <param term='custom'>
  ///      Array of parameters that are host application specific.
  /// </param>
  /// <seealso class='IDTExtensibility2' />
  public void OnDisconnection(Extensibility.ext_DisconnectMode disconnectMode, ref System.Array custom)
  {
   if(disconnectMode !=
    ext_DisconnectMode.ext_dm_HostShutdown)
   {
    OnBeginShutdown(ref custom);
   }
   applicationObject = null;
　　}
　　/// <summary>
  ///      Implements the OnAddInsUpdate method of the IDTExtensibility2 interface.
  ///      Receives notification that the collection of Add-ins has changed.
  /// </summary>
  /// <param term='custom'>
  ///      Array of parameters that are host application specific.
  /// </param>
  /// <seealso class='IDTExtensibility2' />
  public void OnAddInsUpdate(ref System.Array custom)
  {
  }
　　/// <summary>
  ///      Implements the OnStartupComplete method of the IDTExtensibility2 interface.
  ///      Receives notification that the host application has completed loading.
  /// </summary>
  /// <param term='custom'>
  ///      Array of parameters that are host application specific.
  /// </param>
  /// <seealso class='IDTExtensibility2' />
  public void OnStartupComplete(ref System.Array custom)
  {
   CommandBars commandBars =
    applicationObject.ActiveExplorer().CommandBars;
   try
   {
    // If our button is already
    // on the Standard CommandBar, use it.
    btnGetEMailStats = (CommandBarButton)
     commandBars["Standard"].Controls["Email统计"];
   }
   catch
   {
    // OOPS!  Our button is not there, so
    // we need to make a new instance.
    // Note that the Add() method was
    // defined to take optional parameters,
    // which are not supported in C#.  
    // Thus we must specify Missing.value.
    btnGetEMailStats = (CommandBarButton)
     commandBars["Standard"].Controls.Add(1,
     System.Reflection.Missing.value,
     System.Reflection.Missing.value,
     System.Reflection.Missing.value,
     System.Reflection.Missing.value);
    btnGetEMailStats.Caption = "Email统计";
    btnGetEMailStats.Style = MsoButtonStyle.msoButtonCaption;
   }
   // Setting the Tag property is not required, but can be used
   // to quickly reterive your button.
   btnGetEMailStats.Tag = "Email统计";
   // Setting OnAction is also optional, however if you specify
   // the ProgID of the Add-in, the host will automatically
   // load the Add-in if the user clicks on the CommandBarButton when
   // the Add-in is not loaded. After this point, the Click
   // event handler is called.
   btnGetEMailStats.OnAction = "!<EMailStatsAddIn.Connect>";
   btnGetEMailStats.Visible = true;
   // Rig-up the Click event for the new CommandBarButton type.
   btnGetEMailStats.Click += new
    _CommandBarButtonEvents_ClickEventHandler(
    btnGetEMailStats_Click);
  }
　　private void btnGetEMailStats_Click(CommandBarButton Ctrl,
   ref bool CancelDefault)
  {
   string statInfo;
   DateTime today = DateTime.Today;
   // The stats we are tracing.
   int eMailsToday = 0;
   int eMailsThisMonth = 0;
   int eMailSentToday = 0;
   int eMailSentThisMonth = 0;   
   // Get items in user's inbox.
   NameSpace outlookNS = applicationObject.GetNamespace("MAPI");
   MAPIFolder inboxFolder
    = outlookNS.GetDefaultFolder(OlDefaultFolders.olFolderInbox);
   // Compare time received to current day / month
   // and update our counters.
   foreach(object item in inboxFolder.Items)
   {
    MailItem mi = item as MailItem;
    if(mi != null)
    {
     if(mi.ReceivedTime.Day == today.Day)
      eMailsToday++;
     if(mi.ReceivedTime.Month == today.Month)
      eMailsThisMonth++;
    }
   }  
   // Build first part of statInfo string.
   statInfo = string.Format("今天收到Email: {0}\n",
    eMailsToday);
   statInfo += string.Format("这个月收到Email: {0}\n",
    eMailsThisMonth);   
   statInfo += "--------------------------------------\n";
   // Get items in user's sent item folder and
   // test again.
   MAPIFolder SentFolder =   
    outlookNS.GetDefaultFolder(OlDefaultFolders.olFolderSentMail);
   foreach(object item in SentFolder.Items)
   {
    // See if current item is a MailItem
    MailItem mi = item as MailItem;
    if(mi != null)
    {
     // It is, so get day/month stats.
     if(mi.SentOn.Day == today.Day)
      eMailSentToday++;
     if(mi.SentOn.Month == today.Month)
      eMailSentThisMonth++;
    }
   }  
   // Build last part of statInfo string.
   statInfo += string.Format("今天发送Email: {0}\n",
    eMailSentToday);
   statInfo += string.Format("这个月发送Email: {0}\n",
    eMailSentThisMonth);
   // Show results.
   System.Windows.Forms.MessageBox.Show(statInfo, "Email统计结果：");
　　}
　　
  /// <summary>
  ///      Implements the OnBeginShutdown method of the IDTExtensibility2 interface.
  ///      Receives notification that the host application is being unloaded.
  /// </summary>
  /// <param term='custom'>
  ///      Array of parameters that are host application specific.
  /// </param>
  /// <seealso class='IDTExtensibility2' />
  public void OnBeginShutdown(ref System.Array custom)
  {
   CommandBars commandBars =
    applicationObject.ActiveExplorer().CommandBars;
   try
   {
    // Find our button and kill it.
    commandBars["Standard"].Controls["GetEMailStats"].Delete(
     System.Reflection.Missing.value);
   }
   catch(System.Exception ex)
   {System.Windows.Forms.MessageBox.Show(ex.Message);}
　　}
  
  
//  private object applicationObject;
//  private object addInInstance;
}
}

4． 我们运行安装程序，然后打开outlook我们可以看到：

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点击[email统计]按钮，可以看到结果：

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　　总结：
我们还可以在word、access等office软件实现相似的功能。

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