dotnet/wpf · error · InvalidOperationException

throw new…

Error message

throw new InvalidOperationException(SR.Format(SR.MemberNotAllowedForView, "Remove"));

What it means

CollectionViewProxy.Remove(item) forwards to the proxied view's IEditableCollectionView.Remove. If the wrapped view does not implement that interface (null `ecv` at CollectionViewProxy.cs:579), the proxy throws InvalidOperationException because the view cannot remove items.

Solutions

1. Verify support via ProxiedView as IEditableCollectionView (or CanRemove) before calling Remove
2. Mutate the underlying collection directly and rely on INotifyCollectionChanged to refresh the view
3. Back the binding with a collection type whose default view implements IEditableCollectionView

Example fix

// before
proxy.Remove(selectedItem);
// after
if (proxy.CanRemove)
{
    proxy.Remove(selectedItem);
}

if (!proxy.CanRemove) return;
proxy.Remove(item);

bool SupportsRemove(CollectionViewProxy p) => p?.ProxiedView is IEditableCollectionView;

try { proxy.Remove(item); }
catch (InvalidOperationException ex) when (ex.Message.Contains("Remove")) { ((IList)sourceCollection).Remove(item); }

When it happens

Trigger: Calling Remove on a CollectionViewProxy wrapping a view without IEditableCollectionView support (read-only source collections, custom views).

Common situations: Deleting the selected row in a ItemsControl bound to a non-editable collection; migrating from ObservableCollection to a custom/immutable source; view-model code that assumes all views support Remove.

Understand the failure class

Background: UnsupportedOperationException and "is not supported" errors: when a library deliberately refuses a call — this error's family across 30 libraries.

Related errors

• throw new…
• throw new…
• throw new…
• throw new…
• throw new…

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/0dceae711e55a7ba. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/MS/Internal/Data/CollectionViewProxy.cs:579

            else
            {
                throw new InvalidOperationException(SR.Format(SR.MemberNotAllowedForView, "RemoveAt"));
            }
        }

        /// <summary>
        /// Remove the given item from the underlying collection.
        /// </summary>
        void IEditableCollectionView.Remove(object item)
        {
            IEditableCollectionView ecv = ProxiedView as IEditableCollectionView;
            if (ecv != null)
            {
                ecv.Remove(item);
            }
            else
            {
                throw new InvalidOperationException(SR.Format(SR.MemberNotAllowedForView, "Remove"));
            }
        }

        #endregion Removing items

        #region Transactional editing of an item

        /// <summary>
        /// Begins an editing transaction on the given item.  The transaction is
        /// completed by calling either <seealso cref="IEditableCollectionView.CommitEdit"/> or
        /// <seealso cref="IEditableCollectionView.CancelEdit"/>.  Any changes made to the item during
        /// the transaction are considered "pending", provided that the view supports
        /// the notion of "pending changes" for the given item.
        /// </summary>
        void IEditableCollectionView.EditItem(object item)
        {
            IEditableCollectionView ecv = ProxiedView as IEditableCollectionView;
            if (ecv != null)

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