如何在ASP.NET MVC中将文件上传到Sharepoint库？

[HttpPost]
public ActionResult UploadFile(HttpPostedFileBase file)
{
    if (file != null && file.ContentLength > 0)
    {
        // 保存文件到服务器的临时目录
        var fileName = Path.GetFileName(file.FileName);
        var filePath = Path.Combine(Server.MapPath("~/TempFiles"), fileName);
        file.SaveAs(filePath);

        // 连接到Sharepoint库
        using (var clientContext = new ClientContext("https://your-sharepoint-site-url"))
        {
            // 创建文件对象
            var targetLibrary = clientContext.Web.Lists.GetByTitle("Documents");
            var fileCreationInformation = new FileCreationInformation
            {
                Content = System.IO.File.ReadAllBytes(filePath),
                Url = fileName,
                Overwrite = true
            };

            // 将文件上传到Sharepoint库
            var uploadFile = targetLibrary.RootFolder.Files.Add(fileCreationInformation);
            clientContext.ExecuteQuery();

            // 删除服务器上的临时文件
            System.IO.File.Delete(filePath);

            // 返回成功信息
            ViewBag.Message = "文件上传成功！";
        }
    }
    else
    {
        ViewBag.Message = "请选择要上传的文件！";
    }

    return View();
}