Microsoft.VisualStudio.Project.UnsafeNativeMethods.OleGetClipboard C# (CSharp) Method

        internal static extern int OleGetClipboard(out Microsoft.VisualStudio.OLE.Interop.IDataObject dataObject);

        /// <summary>
        /// Determines if the paste command should be allowed.
        /// </summary>
        /// <returns></returns>
        protected internal override bool AllowPasteCommand()
        {
            IOleDataObject dataObject = null;

            try
            {
                ErrorHandler.ThrowOnFailure(UnsafeNativeMethods.OleGetClipboard(out dataObject));
                if (dataObject == null)
                {
                    return(false);
                }

                // First see if this is a set of storage based items
                FORMATETC format = DragDropHelper.CreateFormatEtc((ushort)DragDropHelper.CF_VSSTGPROJECTITEMS);
                if (dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK)
                {
                    return(true);
                }
                // Try reference based items
                format = DragDropHelper.CreateFormatEtc((ushort)DragDropHelper.CF_VSREFPROJECTITEMS);
                if (dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK)
                {
                    return(true);
                }
                // Try windows explorer files format
                format = DragDropHelper.CreateFormatEtc((ushort)NativeMethods.CF_HDROP);
                return(dataObject.QueryGetData(new FORMATETC[] { format }) == VSConstants.S_OK);
            }
            // We catch External exceptions since it might be that it is not our data on the clipboard.
            catch (ExternalException e)
            {
                Trace.WriteLine("Exception :" + e.Message);
                return(false);
            }
        }