Question

I wanted to delete all the Items from SharePoint List using Lists webservice,
i know we can do it by iterating all the items, my problem is that the, i have 25000 items in my list and wanted to delete it in one go, Is there any way to do this?

or is there a way to get all the attributes of List then delte the list and re-create the list with the previously saved attributes.

Thanks in Advance.

Answer 1

Here is the way we can do it simply:

XmlNode listItems = SharepointUtilities.GetListItems(sharePointCredentials, sharePointCredentials.SharePointListName);
        var nodes = (from nd in listItems.ChildNodes.OfType<XmlNode>() where nd.NodeType.Equals(System.Xml.XmlNodeType.Element) select nd);
        var itemIDs = from nd in nodes.FirstOrDefault().ChildNodes.OfType<XmlNode>() where nd.NodeType.Equals(System.Xml.XmlNodeType.Element) select nd.Attributes["ows_ID"].Value;
        if (itemIDs.Count() > 0)
        {
            Lists spSrv = GetSharepointListsService(sharePointCredentials);
            XmlDocument doc = new XmlDocument();
            XmlElement batchElement = doc.CreateElement("Batch");
            batchElement.SetAttribute("OnError", "Continue");
            string batchCommand = "<Method ID='1' Cmd='Delete'><Field Name='ID'>";
            batchCommand += string.Join("</Field></Method><Method ID='1' Cmd='Delete'><Field Name='ID'>", itemIDs.ToArray());
            batchCommand += "</Field></Method>";
            batchElement.InnerXml = batchCommand;
            spSrv.UpdateListItems(sharePointCredentials.SharePointListName, batchElement);

        }