dotnet/wpf · error · ArgumentException

Microsoft.Windows.Controls.SR.Format(Microsoft.Windows.Contr…

Error message

Microsoft.Windows.Controls.SR.Format(Microsoft.Windows.Controls.SR.InvalidCtorParameterNoInfinityForStarSize, "value")

What it means

The RibbonControlLength(value, type) constructor throws this ArgumentException when type is Star and value is PositiveInfinity or NegativeInfinity. Star sizing weights must be finite; infinity is not a valid star value, so the constructor rejects it at construction time.

Solutions

1. Pass a finite double (not double.PositiveInfinity/NegativeInfinity) when constructing a RibbonControlLength with Star sizing
2. Use RibbonControlLength.Auto or a Pixel value if a special size is needed
3. Validate/clamp the value before constructing

When it happens

Trigger: Thrown at src/Microsoft.DotNet.Wpf/src/System.Windows.Controls.Ribbon/Microsoft/Windows/Controls/Ribbon/RibbonControlLength.cs:55 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/4a418538f3d55c65. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/System.Windows.Controls.Ribbon/Microsoft/Windows/Controls/Ribbon/RibbonControlLength.cs:55

        public RibbonControlLength(double pixels)
            : this(pixels, RibbonControlLengthUnitType.Pixel)
        {
        }

        /// <summary>
        ///   Constructor, initializes the RibbonControlLength and specifies what kind of value 
        ///   it will hold.
        /// </summary>
        public RibbonControlLength(double value, RibbonControlLengthUnitType type)
        {
            if (double.IsNaN(value))
            {
                throw new ArgumentException(Microsoft.Windows.Controls.SR.Format(Microsoft.Windows.Controls.SR.InvalidCtorParameterNoNaN, "value"));
            }

            if (type == RibbonControlLengthUnitType.Star && double.IsInfinity(value))
            {
                throw new ArgumentException(Microsoft.Windows.Controls.SR.Format(Microsoft.Windows.Controls.SR.InvalidCtorParameterNoInfinityForStarSize, "value"));
            }

            if (type != RibbonControlLengthUnitType.Auto
                && type != RibbonControlLengthUnitType.Pixel
                && type != RibbonControlLengthUnitType.Item
                && type != RibbonControlLengthUnitType.Star)
            {
                throw new ArgumentException(Microsoft.Windows.Controls.SR.Format(Microsoft.Windows.Controls.SR.InvalidCtorParameterUnknownRibbonControlLengthUnitType, "type"));
            }

            _unitValue = (type == RibbonControlLengthUnitType.Auto) ? 0.0 : value;
            _unitType = type;
        }

        #endregion

        #region Public Methods

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