C# Sharepoint CSOM将文件复制到其他网站集

我想将文档从文档库复制到另一个网站集中的另一个文档库，并将所有附加的元数据一起从一个库复制到另一个库

我想在一个远程事件接收器中，用c#实现这一点

我的问题主要是：如何从这个开始？如果它在同一个网站集中，我可以在同一个上下文中将文档复制到新的库中，但我想我现在需要在不同的上下文中工作

这是我目前的代码：

//Get current Item
                List curList = clientContext.Web.Lists.GetById(properties.ItemEventProperties.ListId);
                ListItem curItem = curList.GetItemById(properties.ItemEventProperties.ListItemId);

                clientContext.Load(curItem);
                clientContext.ExecuteQuery();

                string sNewSite = "url.toOtherSitecollection.com";

                //Can we attempt contextception?
                using (ClientContext siteCollContext = new ClientContext(sNewSite))
                {

                    List destinationList = siteCollContext.Web.Lists.GetByTitle("DocumentLibrary_0001");
                    Folder destinationFolder = siteCollContext.Web.GetFolderByServerRelativeUrl("DocumentLibrary_0001");

                    FileCreationInformation newFileCreation = new FileCreationInformation { Content = Convert.FromBase64String(curItem.ToString()), Overwrite = true };

                    File newFile = destinationFolder.Files.Add(newFileCreation);

                    ListItem newItem = newFile.ListItemAllFields;



                    //Copy all the metadata as well.
                    try
                    {
                        newItem["..."] = curItem["..."];
                        //And all other metadata fields...

                    }
                    catch
                    {
                        //Log this.
                    }

                    newItem.Update();
                    siteCollContext.ExecuteQuery();
                }

---

如果遇到类似情况，以下是我的解决方案供参考：

使用auth为源站点和目标站点创建ClientContext

调用源站点以打开要复制的文件的文件信息

将流从FileInformation读入MemoryStream，该流将用作新复制文件的文件创建信息的内容参数

将新的FileCrationInformation添加到目标文件

static private void CopyFile()
{

    ClientContext contextOrigin = new ClientContext(originSiteURL);
    ClientContext contextDestination = new ClientContext(destinationSiteURL);

    contextOrigin.Credentials = new SharePointOnlineCredentials(originUser, originSecurePassword);
    contextDestination.Credentials = new SharePointOnlineCredentials(destinationUser, destinationSecurePassword);

    //Grab File
    FileInformation fileInformation = Microsoft.SharePoint.Client.File.OpenBinaryDirect(contextOrigin, "/path/to/Document.docx"); //Server relative url
    contextOrigin.ExecuteQuery();

    //Read Stream
    using (MemoryStream memoryStream = new MemoryStream())
    {
        CopyStream(fileInformation.Stream, memoryStream);
        memoryStream.Seek(0, SeekOrigin.Begin);

        //Create Copy
        var fileCreationInfo = new FileCreationInformation
        {
            ContentStream = memoryStream,
            Overwrite = true,
            Url = Path.Combine("path/to/", "CopiedDocument.docx")
        };

        var uploadFile = contextDestination.Web.RootFolder.Files.Add(fileCreationInfo);
        contextDestination.Load(uploadFile);
        contextDestination.ExecuteQuery();

    }
}

发现Copy Stream方法将现有流在内存中复制到新流中。如果不在本地复制FileCreationInfo流，则无法直接从FileInformation流分配FileCreationInfo流

    static private void CopyStream(Stream source, Stream destination)
    {
        byte[] buffer = new byte[32768];
        int bytesRead;
        do
        {
            bytesRead = source.Read(buffer, 0, buffer.Length);
            destination.Write(buffer, 0, bytesRead);
        } while (bytesRead != 0);
    }

---

使用文件信息也可以复制元数据

你必须为另一个站点创建一个单独的上下文并上传文件。如果能对你的代码如何工作做一点解释，那会很有帮助。