dotnet/wpf · error · InvalidOperationException

Microsoft.Windows.Controls.SR.ResizeParametersNotValid

Error message

Microsoft.Windows.Controls.SR.ResizeParametersNotValid

What it means

Resize throws InvalidOperationException(SR.ResizeParametersNotValid) when RibbonMenuItem.ResizePopupInternal(width, height) returns false — i.e. the passed dimensions were rejected by the menu item's internal popup sizing logic even though CanResize was true and dimensions were positive. It signals the resize could not be applied to the popup.

Solutions

  1. Pass dimensions within the popup's realistic min/max size range (measure the popup's constraints first)
  2. Ensure the submenu popup is fully open before resizing
  3. Catch InvalidOperationException and retry with the popup's current size as a baseline
  4. Fall back to resizing via the RibbonMenu's own layout properties instead of UIA

Example fix

// before
transformPattern.Resize(1, 1); // likely rejected by ResizePopupInternal
// after
var target = new Size(Math.Max(minWidth, w), Math.Max(minHeight, h));
if (transformPattern.Current.CanResize)
{
    transformPattern.Resize(target.Width, target.Height);
}
Defensive patterns

Strategy: try-catch

Validate before calling

bool sizeOk = width > 0 && height > 0 && width <= menuItem.MaxPopupWidth && height <= menuItem.MaxPopupHeight; // within popup constraints

Type guard

bool IsWithinPopupBounds(double w, double h) => w > 0 && h > 0 && w <= popup.MaxWidth && h <= popup.MaxHeight;

Try / catch

try { transformPattern.Resize(w, h); } catch (InvalidOperationException) { var s = currentPopupSize; transformPattern.Resize(s.Width, s.Height + delta); }

Prevention

When it happens

Trigger: TransformPattern.Resize(w,h) on a valid, checkable RibbonMenuItem where ResizePopupInternal fails — e.g. dimensions incompatible with the popup's layout constraints, popup not open, or sizes exceeding/falling below internal min/max popup bounds.

Common situations: UIA tests probing extreme popup sizes; resizing while the submenu popup is closing; gallery/dropdown popups whose layout cannot honor the requested size.

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

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/50f5e115da436eb6. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/System.Windows.Controls.Ribbon/Microsoft/Windows/Automation/Peers/RibbonMenuItemDataAutomationPeer.cs:353

            UIElement owner = GetWrapper();
            if (owner == null)
            {
                throw new ElementNotAvailableException(Microsoft.Windows.Controls.SR.VirtualizedElement);
            }

            RibbonMenuItem menuItemOwner = owner as RibbonMenuItem;
            if (menuItemOwner == null)
            {
                throw new InvalidOperationException(Microsoft.Windows.Controls.SR.UIA_OperationCannotBePerformed);
            }

            if (!((ITransformProvider)this).CanResize || width <= 0 || height <= 0)
                throw new InvalidOperationException(Microsoft.Windows.Controls.SR.UIA_OperationCannotBePerformed);

            if (!menuItemOwner.ResizePopupInternal(width, height))
            {
                throw new InvalidOperationException(Microsoft.Windows.Controls.SR.ResizeParametersNotValid);
            }
        }

        void ITransformProvider.Rotate(double degrees)
        {
            throw new InvalidOperationException(Microsoft.Windows.Controls.SR.UIA_OperationCannotBePerformed);
        }

        #endregion

#if !RIBBON_IN_FRAMEWORK
        #region Private methods

        private UIElement GetWrapper()
        {
            UIElement wrapper = null;
            ItemsControlAutomationPeer itemsControlAutomationPeer = ItemsControlAutomationPeer;
            if (itemsControlAutomationPeer != null)

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