dotnet/wpf · error · InvalidOperationException

SR.Format(SR.CannotChangeLiveShaping, "IsLiveFiltering"…

Error message

SR.Format(SR.CannotChangeLiveShaping, "IsLiveFiltering", "CanChangeLiveFiltering")

What it means

BindingListCollectionView exposes IsLiveFiltering only as a read-only indicator (true when the source is an IBindingListView/DataView, null otherwise). Its setter unconditionally throws InvalidOperationException because this view type cannot change live filtering; only views where CanChangeLiveFiltering is true (e.g. ListCollectionView) support it.

Solutions

  1. Remove the setter call; use IsLiveFiltering only to query whether live filtering is enabled.
  2. Use ListCollectionView over a changeable collection when live filtering must be toggled.
  3. Guard the assignment with a type check on the view and CanChangeLiveFiltering.
  4. Toggle filtering via the underlying DataView/IBindingListView instead.

Example fix

// before
((BindingListCollectionView)CollectionViewSource.GetDefaultView(dataTable)).IsLiveFiltering = true;

// after
if (CollectionViewSource.GetDefaultView(dataTable) is ListCollectionView lcv && lcv.CanChangeLiveFiltering)
    lcv.IsLiveFiltering = true;
Defensive patterns

Strategy: validation

Validate before calling

if (view is BindingListCollectionView)
    throw new NotSupportedException("IsLiveFiltering cannot be set on BindingListCollectionView");

Type guard

bool canSetLiveFiltering(CollectionView v) => v is ListCollectionView lcv && lcv.CanChangeLiveFiltering;

Try / catch

try { view.IsLiveFiltering = true; }
catch (InvalidOperationException) { /* property is read-only on this view */ }

Prevention

When it happens

Trigger: Assigning any value to IsLiveFiltering on a BindingListCollectionView (e.g. ((BindingListCollectionView)CollectionViewSource.GetDefaultView(dataTable)).IsLiveFiltering = false;). The throw occurs regardless of the assigned value.

Common situations: Code or XAML that toggles live filtering on the default view of a DataTable/DataView-backed ItemsSource, usually copied from ListCollectionView examples.

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

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/3b3e10b4df14a1bf. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Data/BindingListCollectionView.cs:1134

        /// Calling the setter when CanChangeLiveSorting is false will throw an
        /// InvalidOperationException.
        ///</summary
        public bool? IsLiveSorting
        {
            get { return IsDataView ? (bool?)true : (bool?)null; }
            set { throw new InvalidOperationException(SR.Format(SR.CannotChangeLiveShaping, "IsLiveSorting", "CanChangeLiveSorting")); }
        }

        ///<summary>
        /// Gets or sets a value that indicates whether live filtering is enabled.
        /// The value may be null if the view does not know whether live filtering is enabled.
        /// Calling the setter when CanChangeLiveFiltering is false will throw an
        /// InvalidOperationException.
        ///</summary>
        public bool? IsLiveFiltering
        {
            get { return IsDataView ? (bool?)true : (bool?)null; }
            set { throw new InvalidOperationException(SR.Format(SR.CannotChangeLiveShaping, "IsLiveFiltering", "CanChangeLiveFiltering")); }
        }

        ///<summary>
        /// Gets or sets a value that indicates whether live grouping is enabled.
        /// The value may be null if the view does not know whether live grouping is enabled.
        /// Calling the setter when CanChangeLiveGrouping is false will throw an
        /// InvalidOperationException.
        ///</summary>
        public bool? IsLiveGrouping
        {
            get { return _isLiveGrouping; }
            set
            {
                if (value == null)
                    throw new ArgumentNullException(nameof(value));


                if (value != _isLiveGrouping)

View on GitHub (pinned to 81131a70a4)