上一次我们开发了一个简单的64位COM加载项，虽然功能很简单，但是包括了开发一个64位COM加载项的大部分过程。本次我们来给COM加载项添加一些功能：从SharePoint 2010的文档库中下载一个Excel文档到本地。
<a href="http://files.cnblogs.com/brooks-dotnet/VSTO4/2010.03/2010.03.08_VSTO4_4_DownloadFromSharePointDemo.rar" target="_blank">示例代码下载</a>
本系列所有示例代码均在 Visual Studio 2010 Ultimate RC + Office 2010 Professional Plus Beta x64 上测试通过。
1、首先创建一个Shared AddIn项目（具体细节请参阅上一篇文章）：
2、添加引用：
Microsoft.SharePoint
System.Windows.Forms
System.Drawing
System.DirectoryServices
3、在Connect类中创建Application和COMAddIn的实例：
代码
/// <summary>
/// The object for implementing an Add-in.
/// </summary>
/// <seealso class='IDTExtensibility2' />
[GuidAttribute("6D3788F4-9529-429E-BA5D-09695F85687A"), ProgId("SimpleExcelServicesDemo.Connect")]
public class Connect : Object, Extensibility.IDTExtensibility2
{
private Microsoft.Office.Interop.Excel.Application app;
private Microsoft.Office.Core.COMAddIn addIn;
3、在OnConnection事件里初始化：
public void OnConnection(object application, Extensibility.ext_ConnectMode connectMode, object addInInst, ref System.Array custom)
{
this.app = application as Microsoft.Office.Interop.Excel.Application;
this.addIn = addInInst as Microsoft.Office.Core.COMAddIn;
}
4、在OnStartupComplete事件中设置一个按钮，关联事件处理逻辑：
public void OnStartupComplete(ref System.Array custom)
CommandBars commandBars;
CommandBar standardBar下载数据;
CommandBarButton simpleButton下载数据;
commandBars = this.app.CommandBars;
// Get the standard CommandBar from Word
standardBar下载数据 = commandBars["Standard"];
try
{
// try to reuse the button is hasn't already been deleted
simpleButton下载数据 = (CommandBarButton)standardBar下载数据.Controls["下载数据"];
}
catch (System.Exception)
// If it's not there add a new button
simpleButton下载数据 = (CommandBarButton)standardBar下载数据.Controls.Add(1);
simpleButton下载数据.Caption = "下载数据";
simpleButton下载数据.Style = MsoButtonStyle.msoButtonCaption;
// Make sure the button is visible
simpleButton下载数据.Visible = true;
simpleButton下载数据.Click += new _CommandBarButtonEvents_ClickEventHandler(btnDownload_Click);
standardBar下载数据 = null;
commandBars = null;
5、做一个域用户验证，当用户输入了合法的与用户名和密码后，才允许下载。这里添加了一个WindowsForm到项目中:
private bool fn数据验证()
if (this.txt用户名.Text.Trim() == string.Empty)
MessageBox.Show("用户名不能为空！");
this.txt用户名.Focus();
return true;
if (this.txt密码.Text.Trim() == string.Empty)
MessageBox.Show("密码不能为空！");
this.txt密码.Focus();
if (this.fn域用户验证(@"LDAP://192.168.1.100/DC=BROOKS,DC=com", this.txt用户名.Text.Trim(), this.txt密码.Text.Trim()))
MessageBox.Show("您输入的用户名或密码错误，请重新输入！");
this.txt密码.Clear();
return false;
private bool fn域用户验证(string path, string username, string pwd)
DirectoryEntry entry = new DirectoryEntry(path, username, pwd);
DirectorySearcher search = new DirectorySearcher(entry);
search.Filter = "(SAMAccountName=" + username + ")";
SearchResult result = search.FindOne();
if (null == result)
{
return true;
}
else
return false;
catch
7、使用Windows Server 2008 R2的AD管理器创建一个域用户：test
8、在Connect中编写下载文件逻辑：
private void fn下载文件()
//保存文件
using (SPSite site = new SPSite("http://brookspc/sites/doc"))
SPWeb web = site.OpenWeb();
string __fileName = "http://brookspc/sites/doc/Documents/Excel Services Test.xlsx";
SPFile file = web.GetFile(__fileName);
string __localFilePath = @"C:\ExcelServices.xlsx";
//将文件下载到本地
byte[] content = file.OpenBinary();
if (File.Exists(__localFilePath))
File.Delete(__localFilePath);
FileStream fs = new FileStream(__localFilePath, FileMode.Create);
fs.Write(content, 0, content.Length);
fs.Flush();
fs.Close();
9、按钮事件处理逻辑：
public void btnDownload_Click(CommandBarButton sender, ref bool cancelDefault)
FrmLogin login = new FrmLogin();
if (login.ShowDialog() == System.Windows.Forms.DialogResult.OK)
this.fn下载文件();
10、编译一下，安装生成的setup.exe：
11、打开Excel，点击【下载数据】：
12、输入域用户名、密码后，点击【登录】，即把SharePoint中的文件下载到了本地，默认在C盘：
小结：
本次只是添加了一些功能，和SharePoint 2010进行了交互，下载了一个文档，其中用到了域用户的验证。后续篇章会继续将VSTO与其他技术进行整合，构建一个完善的解决方案。