向SPS列表中添加附件

怎样向一个列表添加附件呢?
查了很多资料,最后在wss的SDK上找到答案。
代码如下:
PSite site = SPContext.Current.Site;
SPWeb srcSite = site.AllWebs["Site_Name"];

SPFile file = srcSite.Folders["Folder_Name"].Files["File_Name"];

SPList list = srcSite.Lists["Announcements"];
SPListItem listItem = list.Items[5];

SPAttachmentCollection attachments = listItem.Attachments;

string fileName = file.Name;

byte[] binFile = file.OpenBinary();

attachments.Add(fileName, binFile);

listItem.Update();

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