dotnet/wpf · error · ElementNotEnabledException

ElementNotEnabledException

Error message

ElementNotEnabledException

What it means

RangeBaseAutomationPeer's IRangeValueProvider.SetValue throws ElementNotEnabledException when the owning control (e.g. Slider, ProgressBar, ScrollBar) is disabled. UIA SetValue requests must not succeed on disabled elements, so the peer explicitly raises this COM-visible UIA exception.

Solutions

1. Enable the owner control before setting the value (owner.IsEnabled = true)
2. Check owner.IsEnabled before issuing the UIA SetValue call
3. Catch ElementNotEnabledException and surface a 'control disabled' message to the user/test

Example fix

// before
((IValueProvider)peer.GetPattern(PatternInterface.RangeValue)).SetValue(50);
// after
if (slider.IsEnabled)
    ((IRangeValueProvider)peer).SetValue(50);
else
    slider.IsEnabled = true; // then set

if (!rangeBase.IsEnabled) throw/return /* handle disabled */;

static bool CanSetValue(RangeBase c) => c?.IsEnabled == true;

try { rangeValueProvider.SetValue(val); }
catch (ElementNotEnabledException) { /* owner disabled; enable or report */ }

When it happens

Trigger: Calling SetValue(double) on the RangeValue pattern when RangeBaseAutomationPeer.IsEnabled() returns false (owner control IsEnabled=false).

Common situations: Test scripts setting a Slider value while the control is disabled; UIA clients driving forms where a field is disabled until validation passes.

Related errors

• ElementNotEnabledException
• ElementNotEnabledException
• ElementNotEnabledException
• ElementNotEnabledException
• ArgumentOutOfRangeException

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/dde2cb2b24970b9e. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationFramework/System/Windows/Automation/Peers/RangeBaseAutomationPeer.cs:70

        internal virtual void SetValueCore(double val)
        {
            RangeBase owner = (RangeBase)Owner;
            ArgumentOutOfRangeException.ThrowIfLessThan(val, owner.Minimum);
            ArgumentOutOfRangeException.ThrowIfGreaterThan(val, owner.Maximum);

            owner.Value = (double)val;
        }

        /// <summary>
        /// Request to set the value that this UI element is representing
        /// </summary>
        /// <param name="val">Value to set the UI to, as an object</param>
        /// <returns>true if the UI element was successfully set to the specified value</returns>
        //[CodeAnalysis("AptcaMethodsShouldOnlyCallAptcaMethods")] //Tracking Bug: 29647
        void IRangeValueProvider.SetValue(double val)
        {
            if (!IsEnabled())
                throw new ElementNotEnabledException();

            SetValueCore(val);
        }


        /// <summary>Value of a value control, as an object</summary>
        double IRangeValueProvider.Value
        {
            get
            {
                return ((RangeBase)Owner).Value;
            }
        }

        ///<summary>Indicates that the value can only be read, not modified.
        ///returns True if the control is read-only</summary>
        bool IRangeValueProvider.IsReadOnly
        {

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