SharePoint 2007:如何以编程方式上传二进制文件到文档库

我在SharePoint 2007中以编程方式创建一个项目到文档库时遇到问题。

下面是我的代码片段，也许你能指出我的错误:

SPSecurity.RunWithElevatedPrivileges(delegate()
{
    using (SPSite site = new SPSite(_url))
    {
        using (SPWeb web = site.OpenWeb())
        {
            SPList customList = web.Lists["Test1"];
            foreach (SPListItem ltItem in customList.Items)
            {
                if (ltItem.Attachments != null && ltItem.Attachments.Count > 0)
                {
                    //Get Test1 File Collection
                    SPFolder folder = web.GetFolder(ltItem.Attachments.UrlPrefix);
                    SPFileCollection fileColl = folder.Files;
                    //Get binary data of attachment
                    SPFile file = ltItem.ParentList.ParentWeb.GetFile(ltItem.Attachments.UrlPrefix + ltItem.Attachments[0]);
                    byte[] fileData = file.OpenBinary();
                    //Get Relative URL of attachment destination
                    string destFile = fileColl.Folder.Url + "/" + file.Name;
                    web.AllowUnsafeUpdates = true;
                    //Add attachment into Document Library
                    SPDocumentLibrary docLib = (SPDocumentLibrary)web.Lists["Test2"];
                    SPFile file2 = docLib.RootFolder.Files.Add(destFile, fileData, true);
                    file2.Item.Update();
                    web.AllowUnsafeUpdates = false;
                }
            }
        }
    }
});

我在代码file2.Item.Update();

提前谢谢。

string destFile = file.Name;