dotnet/wpf · error · ArgumentException

If AllGestures is specified, it must be the only…

Error message

If AllGestures is specified, it must be the only ApplicationGesture in the ApplicationGesture array.

What it means

Because ApplicationGesture.AllGestures is a wildcard, it cannot be combined with specific gestures. GetApplicationGestureArrayAndVerify throws ArgumentException (SR.AllGesturesMustExistAlone) if AllGestures appears together with any other gesture in the array passed to EnabledGestures.

Solutions

Use AllGestures alone to enable all gestures
Drop AllGestures from combined lists and rely on the specific gestures only
Normalize: if AllGestures is present, assign new[]{ ApplicationGesture.AllGestures } and ignore the rest

Example fix

// before
recognizer.EnabledGestures = new[] { ApplicationGesture.AllGestures, ApplicationGesture.Down };
// after
recognizer.EnabledGestures = new[] { ApplicationGesture.AllGestures }; // or omit AllGestures and list specific gestures

Defensive patterns

Strategy: validation

Validate before calling

bool hasAll = gestures.Contains(ApplicationGesture.AllGestures);
if (hasAll && gestures.Length > 1)
    throw new ArgumentException("AllGestures must be the only entry", nameof(gestures));

Type guard

static bool AllGesturesAlone(ApplicationGesture[] g) => !g.Contains(ApplicationGesture.AllGestures) || g.Length == 1;

Try / catch

try { recognizer.EnabledGestures = gestures; }
catch (ArgumentException) { recognizer.EnabledGestures = new[]{ ApplicationGesture.AllGestures }; }

Prevention

If AllGestures is present, assign it alone and skip the rest
Document AllGestures as a wildcard that excludes specific entries
Normalize merged gesture configs before applying

When it happens

Trigger: Assigning EnabledGestures = new[]{ ApplicationGesture.AllGestures, ApplicationGesture.Down, ... } or appending AllGestures to a specific list.

Common situations: 'Enable everything plus these extras' configurations; merging an AllGestures default with per-app gesture selections.

Related errors

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/da9a0f1b24bc6d14. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationCore/MS/internal/Ink/GestureRecognizer/NativeRecognizer.cs:240

                if (gesture == ApplicationGesture.AllGestures)
                {
                    foundAllGestures = true;
                }

                //check for dupes
                if (gestures.Contains(gesture))
                {
                    throw new ArgumentException(SR.DuplicateApplicationGestureFound, nameof(applicationGestures));
                }

                gestures.Add(gesture);
            }

            // AllGesture cannot be specified with other gestures
            if (foundAllGestures && gestures.Count != 1)
            {
                // no dupes allowed
                throw new ArgumentException(SR.AllGesturesMustExistAlone, nameof(applicationGestures));
            }

            return gestures.ToArray();
        }

        #endregion Internal Methods

        //-------------------------------------------------------------------------------
        //
        // IDisposable
        //
        //-------------------------------------------------------------------------------

        #region IDisposable

        /// <summary>
        /// A simple pattern of the dispose implementation.
        /// There is no finalizer since the SafeHandle will take care of releasing the context.

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