VirtualObjectListView.cs - protected new virtual int VirtualListSize set failed

[steffen27schulze]

Hi

in ObjectListView\VirtualObjectListView.cs Line 392-400
setting protected new virtual int VirtualListSize failed with an NULL-Excepetion because the reflection works not anymore with .net 7?

[Genicee]

I am guessing there won't be any progress made on this by this point and I should probably start looking for an alternative.

[amoamare]

I am guessing there won't be any progress made on this by this point and I should probably start looking for an alternative.

To fix the issue with ObjectListView
You need to update the function VirtualListSize with the following

        /// <summary>
        /// Gets or sets the number of rows in this virtual list.
        /// </summary>
        /// <remarks>
        /// There is an annoying feature/bug in the .NET ListView class. 
        /// When you change the VirtualListSize property, it always scrolls so
        /// that the focused item is the top item. This is annoying since it makes
        /// the virtual list seem to flicker as the control scrolls to show the focused
        /// item and then scrolls back to where ObjectListView wants it to be.
        /// </remarks>
        [Browsable(false),
         DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]

        protected new virtual int VirtualListSize
        {
            get { return base.VirtualListSize; }
            set
            {
                if (value == this.VirtualListSize || value < 0)
                    return;

                // Get around the 'private' marker on 'virtualListSize' field using reflection
                GetVirtualListSizeField(this) = value;


                // Send a raw message to change the virtual list size *without* changing the scroll position
                if (this.IsHandleCreated && !this.DesignMode)
                    NativeMethods.SetItemCount(this, value);
            }
        }

        [UnsafeAccessor(UnsafeAccessorKind.Field, Name = "_virtualListSize")]
        private static extern ref int GetVirtualListSizeField(ListView listView);

[amoamare]

Hi

in ObjectListView\VirtualObjectListView.cs Line 392-400 setting protected new virtual int VirtualListSize failed with an NULL-Excepetion because the reflection works not anymore with .net 7?

See my response above, i just came across this issue my self.