dotnet/wpf · error · ArgumentOutOfRangeException

ArgumentOutOfRangeException

Error message

ArgumentOutOfRangeException

What it means

ITransformProvider.Move on GridSplitterAutomationPeer validates its arguments after the enabled check: a double.IsInfinity or double.IsNaN x coordinate throws ArgumentOutOfRangeException(nameof(x)). The splitter can only be moved by finite deltas.

Solutions

1. Validate/clamp x to a finite value before calling Move (double.IsFinite check).
2. Fix the upstream coordinate computation producing Infinity/NaN (guard divisions by zero).
3. Catch ArgumentOutOfRangeException in the caller and log the bad input.
4. Use KeyboardMoveSplitter via UI only with deltas derived from actual element bounds.

Example fix

// before
transform.Move(dx, dy); // dx may be NaN
// after
if (double.IsFinite(dx)) transform.Move(dx, dy);

if (!double.IsFinite(x)) throw new ArgumentException("x must be finite");

static bool IsFiniteDelta(double d) => !double.IsNaN(d) && !double.IsInfinity(d);

try { ((ITransformProvider)peer).Move(x, y); }
catch (ArgumentOutOfRangeException ex) { /* log invalid coordinate */ }

When it happens

Trigger: Calling Move with x = double.PositiveInfinity, double.NegativeInfinity, or NaN — typically from computed coordinates that divided by zero or were passed uninitialized from UIA automation code.

Common situations: Test scripts computing delta from measurements that produce NaN (0/0), uninitialized double fields, or translation of screen coordinates where a divide-by-width yielded Infinity.

Understand the failure class

Background: "Must be a positive integer", "Invalid value", "Unsupported": the invalid-argument-value error family, when a library rejects the value you pass — this error's family across 35 libraries.

Related errors

• ElementNotEnabledException
• SR.TextRangeProvider_EmptyStringParameter
• SR.TextRangeProvider_InvalidParameterValue
• SR.UIA_OperationCannotBePerformed
• ' ' is not a valid value for ' '.

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/ef91e20638016543. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/GridSplitterAutomationPeer.cs:43

            if (patternInterface == PatternInterface.Transform)
                return this;
            else
                return base.GetPattern(patternInterface); 
        }

        #region ITransformProvider

        bool ITransformProvider.CanMove { get { return true; } }
        bool ITransformProvider.CanResize { get { return false; } }
        bool ITransformProvider.CanRotate { get { return false; } }

        void ITransformProvider.Move(double x, double y)
        {
            if (!IsEnabled())
                throw new ElementNotEnabledException();

            if (double.IsInfinity(x) || double.IsNaN(x))
                throw new ArgumentOutOfRangeException(nameof(x));

            if (double.IsInfinity(y) || double.IsNaN(y))
                throw new ArgumentOutOfRangeException(nameof(y));

            ((GridSplitter)Owner).KeyboardMoveSplitter(x, y);
        }
        void ITransformProvider.Resize(double width, double height)
        {
            throw new InvalidOperationException(SR.UIA_OperationCannotBePerformed);
        }
        void ITransformProvider.Rotate(double degrees)
        {
            throw new InvalidOperationException(SR.UIA_OperationCannotBePerformed);
        }

        #endregion
    }
}

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