How to delete versions without having column name

问题:

In version history i am getting some duplicate versions with out any field changed....So for those versions the column name will be empty. Programmatically i would like to delete the versions in the version history where no column name specified... Please help..

In the image you can see the blank versions...I need to remove those versions

回答1:

The code below deletes versions from the list item. You can re-use it and add the condition of checking the name as empty.

///

    /// Removes unneeded versions from a sharepoint list item

    /// </summary>

    /// <param name="item">The SPListItem that needs some versions removed</param>

    /// <param name="minVersions">The minimum number of versions to keep</param>

    /// <param name="savedVersions">A collection of important version labels (or null)</param>

    /// <returns>The number of versions deleted</returns>

    internal static int RemoveVersions(SPListItem item, int minVersions, ICollection<string> savedVersions)

    {

        //  Homework for the reader: validate the input arguments.

        //  if item is null, throw an ArgumentNullException

        //  if minVersions < 0 throw an ArgumentOutOfRangeException



        int deletedCount = 0;

        int i = minVersions;    // start looking for old versions after skipping minVersions



        while (i < item.Versions.Count)

        {

            SPListItemVersion itemVersion = item.Versions[i];

            string versionLabel = itemVersion.VersionLabel;



            if (!itemVersion.IsCurrentVersion &&    // Not "current" according to SharePoint (e.g. last-published major version, moderated version)

                (savedVersions == null || !savedVersions.Contains(versionLabel)))  // not one of our "saved" versions

            {

                itemVersion.Delete();

                ++deletedCount;

            }

            else

            {

                ++i;

            }

        }



        return deletedCount;

    }