How to overwrite the attachment for List Item CSOM C#?

Question

I am using following code to attach the image file to the list item using C# CSOM.

using (ClientContext clientContext = new ClientContext(siteUrl)) { List list = clientContext.Web.Lists.GetByTitle(ListName); ListItem item = list.GetItemById(1); var attachment = new AttachmentCreationInformation(); attachment.FileName = "fileName.jpg"; attachment.ContentStream = fs; // My file stream Attachment att = item.AttachmentFiles.Add(attachment); clientContext.Load(att); clientContext.ExecuteQuery(); }

It work fine, but when I try to attach the file with the same name then it throw an error:

The specified name is already in use.The document or folder name was not changed. To change the name to a different value, close this dialog and edit the properties of the document or folder

I want that previous file should be overwrite with new file. I am unable to find any properties.

Any suggestions?

There is no overwrite feature for attachments. Best alternative is to check if similar file exists then delete and upload. — Amal Hashim
– Amal Hashim, Commented Jun 1, 2017 at 9:05

Gautam Sheth · Accepted Answer · 2017-06-01 09:30:23Z

It wont work with item.AttachmentFiles.Add method. But you can use SaveBinaryDirect method to overwrite the attachment.

var list = context.Web.Lists.GetByTitle("CustomList"); var attachFilePath = @"C:\abcd.jpg"; var listItem = list.GetItemById(4); context.Load(listItem); context.ExecuteQuery(); using (System.IO.FileStream fileStream = new System.IO.FileInfo(attachFilePath).Open(System.IO.FileMode.Open)) { Microsoft.SharePoint.Client.File.SaveBinaryDirect(context, "/sites/GautamTestSite/Lists/CustomList/Attachments/" + listItem.Id + "/" + System.IO.Path.GetFileName(attachFilePath), fileStream, true); }

Thanks for the answer. I'll revert back once I am done with implementing this code. — Trimantra Software Solution
– Trimantra Software Solution, Commented Jun 1, 2017 at 9:33
hey @TrimantraSoftwareSolution, any luck here ? I tried the code and its working for me :) — Gautam Sheth
– Gautam Sheth, Commented Jun 5, 2017 at 10:30

ThinkB4Code · Accepted Answer · 2017-06-01 10:39:05Z

You can use the following code to add an item or update it if its already exists.

 void AddOrUpdateListItemAttachment(ClientContext ctx, ListItem item, string fileName, Stream fileContent) { var file = item.AttachmentFiles.Where(a => a.FileName.Equals(fileName)).FirstOrDefault(); if (file != null) { file.DeleteObject(); ctx.ExecuteQuery(); } AttachmentCreationInformation attach = new AttachmentCreationInformation(); attach.FileName = fileName; attach.ContentStream = fileContent; item.AttachmentFiles.Add(attach); ctx.ExecuteQuery(); }

Make sure when you pass ListItem object to this function it must be loaded along with its property "AttachmentFiles". You can use following code to load item.

ctx.Load(listItem, i => i.AttachmentFiles);

Trimantra Software Solution · Accepted Answer · 2017-06-01 09:44:22Z

Based on the comment of @Amal Hashim and with reference to following:

AttachmentCreationInformation properties
AttachmentCreationInformation members

Available members are:

We can say that there are no ways to overwrite the attachment using AttachmentCreationInformation.

If anyone has some more reference then are welcomed to provide here.

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