Question

我有一个SharePoint List，我正在使用客户端对象模型添加新的ListItems。添加ListItems不是问题，效果很好。

现在我要添加附件。

我正在以下列方式使用SaveBinaryDirect：

File.SaveBinaryDirect(clientCtx, url.AbsolutePath + "/Attachments/31/" + fileName, inputStream, true);

只要我尝试添加附件的项目已经具有通过SharePoint网站添加的附件而不使用客户端对象模型，它就没有任何问题。

当我尝试将附件添加到没有任何附件的项目时，我会收到以下错误（两者都发生但没有相同的文件 - 但这两个消息始终显示）：

The remote server returned an error: (409) Conflict

The remote server returned an error: (404) Not Found

我想我可能需要先为此项目创建附件文件夹。当我尝试以下代码时：

clientCtx.Load(ticketList.RootFolder.Folders);
clientCtx.ExecuteQuery();
clientCtx.Load(ticketList.RootFolder.Folders[1]);             // 1 -> Attachment folder
clientCtx.Load(ticketList.RootFolder.Folders[1].Folders);
clientCtx.ExecuteQuery();
Folder folder = ticketList.RootFolder.Folders[1].Folders.Add("33");
clientCtx.ExecuteQuery();

我收到一条错误消息：

Cannot create folder "Lists/Ticket System/Attachment/33"

我拥有SharePoint网站/列表的完全管理员权限。

任何想法我可能做错了什么？

谢谢，Thorben

Answer 1

我也在这个问题上挣扎了很长时间，所以我想我会发布一个完整的代码示例，展示如何成功创建列表项并添加附件。

我使用Client Object API创建列表项，使用SOAP Web服务添加附件。这是因为，如在Web上的其他位置所述，客户端对象API仅可用于向项目的上载目录已存在的项目添加附件（例如，如果项目已经具有附件）。否则它会因409错误而失败。 SOAP Web服务虽然可以解决这个问题。

请注意，我必须克服的另一件事是即使我使用以下URL添加了SOAP引用：

https://my.sharepoint.installation/personal/test/_vti_bin/lists.asmx

VS实际添加到app.config的URL是：

https://my.sharepoint.installation/_vti_bin/lists.asmx

我不得不手动将app.config更改回正确的URL，否则我会收到错误：

列表不存在。您选择的页面包含一个不存在的列表。它可能已被其他用户删除。 0x82000006

以下是代码：

    void CreateWithAttachment()
    {
        const string listName = "MyListName";
        // set up our credentials
        var credentials = new NetworkCredential("username", "password", "domain");

        // create a soap client
        var soapClient = new ListsService.Lists();
        soapClient.Credentials = credentials;

        // create a client context
        var clientContext = new Microsoft.SharePoint.Client.ClientContext("https://my.sharepoint.installation/personal/test");
        clientContext.Credentials = credentials;

        // create a list item
        var list = clientContext.Web.Lists.GetByTitle(listName);
        var itemCreateInfo = new ListItemCreationInformation();
        var newItem = list.AddItem(itemCreateInfo);

        // set its properties
        newItem["Title"] = "Created from Client API";
        newItem["Status"] = "New";
        newItem["_Comments"] = "here are some comments!!";

        // commit it
        newItem.Update();
        clientContext.ExecuteQuery();

        // load back the created item so its ID field is available for use below
        clientContext.Load(newItem);
        clientContext.ExecuteQuery();

        // use the soap client to add the attachment
        const string path = @"c:\temp\test.txt";
        soapClient.AddAttachment(listName, newItem["ID"].ToString(), Path.GetFileName(path),
                                  System.IO.File.ReadAllBytes(path));
    }

希望这有助于某人。

Answer 2

我与微软讨论了这个问题。看起来只有一种远程创建附件的方法是List.asmx Web服务。我也试图创建这个子文件夹但没有成功。

Answer 3

使用Sharepoint 2010，无法使用COM将第一个附件上传到列表项。建议是使用列表网络服务。

使用Sharepoint 2013可以实现。

AttachmentCreationInformation newAtt = new AttachmentCreationInformation();
newAtt.FileName = "myAttachment.txt";
// create a file stream
string fileContent = "This file is was ubloaded by client object meodel ";
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
byte[] buffer = enc.GetBytes(fileContent);
newAtt.ContentStream = new MemoryStream(buffer);

// att new item or get existing one
ListItem itm = list.GetItemById(itemId);
ctx.Load(itm);   
// do not execute query, otherwise a "version conflict" exception is rised, but the file         is uploaded
// add file to attachment collection
newAtt.ContentStream = new MemoryStream(buffer);
itm.AttachmentFiles.Add(newAtt); 
AttachmentCollection attachments = itm.AttachmentFiles;
ctx.Load(attachments);
ctx.ExecuteQuery(); 
// see all attachments for list item
// this snippet works if the list item has no attachments

此方法用于http://www.mailtosharepoint.net/

Answer 4

在Microsoft SharePoint团队中，由于没有提出对该问题的确认以及有关如何解决该问题的可用建议，因此反映得相当糟糕。以下是我处理它的方式：

我正在使用产品附带的新SharePoint 2010托管客户端。因此，我已经有一个带有凭据的SharePoint ClientContext。以下函数将附件添加到列表项：

private void SharePoint2010AddAttachment(ClientContext ctx, 
                                     string listName, string itemId, 
                                     string fileName, byte[] fileContent)
{
    var listsSvc = new sp2010.Lists();
    listsSvc.Credentials = _sharePointCtx.Credentials;
    listsSvc.Url = _sharePointCtx.Web.Context.Url + "_vti_bin/Lists.asmx";
    listsSvc.AddAttachment(listName, itemId, fileName, fileContent);
}

上面代码的唯一先决条件是添加到项目（我使用Visual Studio 2008）_web_reference_我称为sp2010，它是从以下URL创建的：http：// / _vti_bin / Lists.asmx

Bon Chance ......

Answer 5

我已经在我的CSOM（SharePoint客户端对象模型）应用程序中使用并尝试了这个，它适用于我

using (ClientContext context = new ClientContext("http://spsite2010"))
                {

                    context.Credentials = new NetworkCredential("admin", "password");
                    Web oWeb = context.Web;
                    List list = context.Web.Lists.GetByTitle("Tasks");
                    CamlQuery query = new CamlQuery();
                    query.ViewXml = "<View><Where><Eq><FieldRef Name = \"Title\"/><Value Type=\"String\">New Task Created</Value></Eq></Where></View>";
                    ListItemCollection listItems = list.GetItems(query);
                    context.Load(listItems);
                    context.ExecuteQuery();
                    FileStream oFileStream = new FileStream(@"C:\\sample.txt", FileMode.Open);
                    string attachmentpath = "/Lists/Tasks/Attachments/" + listItems[listItems.Count - 1].Id + "/sample.txt";
                    Microsoft.SharePoint.Client.File.SaveBinaryDirect(context, attachmentpath, oFileStream, true);
                }

注意：仅在已创建项目文件夹时才有效

Answer 6

HTML：

<asp:FileUpload ID="FileUpload1" runat="server" AllowMultiple="true" />

代码背后的事件：

protected void UploadMultipleFiles(object sender, EventArgs e)
{
    Common.UploadDocuments(Common.getContext(new Uri(Request.QueryString["SPHostUrl"]),
    Request.LogonUserIdentity), FileUpload1.PostedFiles, new CustomerRequirement(), 5);
}

public static List<string> UploadDocuments<T>(ClientContext ctx,IList<HttpPostedFile> selectedFiles, T reqObj, int itemID)
{
    List<Attachment> existingFiles = null;
    List<string> processedFiles = null;
    List<string> unProcessedFiles = null;
    ListItem item = null;
    FileStream sr = null;
    AttachmentCollection attachments = null;
    byte[] contents = null;
    try
    {
        existingFiles = new List<Attachment>();
        processedFiles = new List<string>();
        unProcessedFiles = new List<string>();
        //Get the existing item
        item = ctx.Web.Lists.GetByTitle(typeof(T).Name).GetItemById(itemID);
        //get the Existing attached attachments
        attachments = item.AttachmentFiles;
        ctx.Load(attachments);
        ctx.ExecuteQuery();
        //adding into the new List
        foreach (Attachment att in attachments)
            existingFiles.Add(att);
        //For each Files which user has selected
        foreach (HttpPostedFile postedFile in selectedFiles)
        {
            string fileName = Path.GetFileName(postedFile.FileName);
            //If selected file not exist in existing item attachment
            if (!existingFiles.Any(x => x.FileName == fileName))
            {
                //Added to Process List
                processedFiles.Add(postedFile.FileName);
            }
            else
                unProcessedFiles.Add(fileName);
        }
        //Foreach process item add it as an attachment
        foreach (string path in processedFiles)
        {
            sr = new FileStream(path, FileMode.Open);
            contents = new byte[sr.Length];
            sr.Read(contents, 0, (int)sr.Length);
            var attInfo = new AttachmentCreationInformation();
            attInfo.FileName = Path.GetFileName(path);
            attInfo.ContentStream = sr;
            item.AttachmentFiles.Add(attInfo);
            item.Update();
        }
        ctx.ExecuteQuery();
    }
    catch (Exception ex)
    {
        throw ex;
    }
    finally
    {
        existingFiles = null;
        processedFiles = null;
        item = null;
        sr = null;
        attachments = null;
        contents = null;
        ctx = null;

    }
    return unProcessedFiles;
}

SharePoint 2010 - 客户端对象模型 - 向ListItem添加附件

6 个答案: