dotnet/wpf · error · ArgumentException

SR.InvalidGuid

Error message

SR.InvalidGuid

What it means

StrokeCollection.GetPropertyData throws ArgumentException when propertyDataId equals Guid.Empty. Custom stroke properties are keyed by a non-empty Guid identifier; Guid.Empty is never a valid property key in the ink ExtendedProperties store. The library rejects it immediately to prevent an unresolvable property lookup.

Solutions

1. Ensure the property Guid is a real generated identifier; assign it via new Guid("...") or a const Guid and verify it is not Guid.Empty before calling GetPropertyData.
2. Add a guard in the caller: if (propertyDataId == Guid.Empty) throw/log before calling GetPropertyData.
3. If the Guid originates from parsed input, use Guid.TryParse/Exactlyn and reject empty results.

Example fix

// before
var value = strokes.GetPropertyData(someGuid); // someGuid is Guid.Empty
// after
if (someGuid == Guid.Empty)
    throw new InvalidOperationException("Property GUID was not initialized");
var value = strokes.GetPropertyData(someGuid);

if (propertyDataId == Guid.Empty)
    throw new ArgumentException("Property data GUID must be a non-empty Guid", nameof(propertyDataId));
// safe to call:
var value = strokes.GetPropertyData(propertyDataId);

static bool IsValidPropertyId(Guid id) => id != Guid.Empty;

try { return strokes.GetPropertyData(id); }
catch (ArgumentException ex) when (ex.ParamName == "propertyDataId") { return null; }

When it happens

Trigger: Calling StrokeCollection.GetPropertyData(Guid.Empty). Typically happens when the Guid came from an uninitialized field, a default(Guid) struct, or a failed Guid.TryParse whose result was used anyway.

Common situations: Developers storing/retrieving custom metadata (e.g. author name, drawing attributes) on ink strokes pass a Guid field that was never assigned; serializing/deserializing property IDs from config where the empty string parsed to Guid.Empty.

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

• Drawing Attribute tag embedded in ISF stream does not match…
• Duplicate ApplicationGesture values are not allowed.
• Global Custom Attribute tag embedded in ISF stream does not…
• GUID cannot be empty.
• If AllGestures is specified, it must be the only…

AI-assisted analysis of dotnet/wpf@81131a70a4 (2026-09-14). Data as JSON: /api/errors/bcc797ccd97560a8. Report an issue: GitHub.

Appendix: source

Thrown at src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Ink/StrokeCollection.cs:187

        /// </summary>
        /// <param name="propertyDataId"></param>
        public void RemovePropertyData(Guid propertyDataId)
        {
            object propertyData = GetPropertyData(propertyDataId);
            this.ExtendedProperties.Remove(propertyDataId);
            // fire notification
            OnPropertyDataChanged(new PropertyDataChangedEventArgs(propertyDataId, null, propertyData));
        }

        /// <summary>
        /// Allows retrieval of objects from the EPC
        /// </summary>
        /// <param name="propertyDataId"></param>
        public object GetPropertyData(Guid propertyDataId)
        {
            if ( propertyDataId == Guid.Empty )
            {
                throw new ArgumentException(SR.InvalidGuid, nameof(propertyDataId));
            }

            return this.ExtendedProperties[propertyDataId];
        }

        /// <summary>
        /// Allows retrieval of a Array of guids that are contained in the EPC
        /// </summary>
        public Guid[] GetPropertyDataIds()
        {
            return this.ExtendedProperties.GetGuidArray();
        }

        /// <summary>
        /// Allows the checking of objects in the EPC
        /// </summary>
        /// <param name="propertyDataId"></param>
        public bool ContainsPropertyData(Guid propertyDataId)

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