{"record":{"id":"cc2b43ea712948cc","repo":"dotnet/wpf","slug":"sr-animation-notextchildren-coloranimationusingkeyframes","errorCode":null,"errorMessage":"SR.Animation_NoTextChildren","messagePattern":"SR\\.Animation_NoTextChildren","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/Animation/Generated/ColorAnimationUsingKeyFrames.cs","lineNumber":277,"sourceCode":"        /// WritePreamble() or WritePostscript().  It also doesn't throw an\n        /// ArgumentNullException if the childText parameter is null.  These tasks\n        /// are performed by the interface implementation.  Therefore, it's OK\n        /// for a derived class to override this method and call the base\n        /// class implementation only if they determine that it's the right\n        /// course of action.  The derived class can rely on KeyFrameAnimation's\n        /// implementation of IAddChild.AddChild or implement their own\n        /// following the Freezable pattern since that would be a public\n        /// method.\n        /// </remarks>\n        /// <param name=\"childText\">A string representing the child text that\n        /// should be added.  If this is a KeyFrameAnimation an exception will be\n        /// thrown.</param>\n        /// <exception cref=\"InvalidOperationException\">Timelines have no way\n        /// of adding text.</exception>\n        [EditorBrowsable(EditorBrowsableState.Advanced)]\n        protected virtual void AddText(string childText)\n        {\n            throw new InvalidOperationException(SR.Animation_NoTextChildren);\n        }\n\n        #endregion\n\n        #region ColorAnimationBase\n\n        /// <summary>\n        /// Calculates the value this animation believes should be the current value for the property.\n        /// </summary>\n        /// <param name=\"defaultOriginValue\">\n        /// This value is the suggested origin value provided to the animation\n        /// to be used if the animation does not have its own concept of a\n        /// start value. If this animation is the first in a composition chain\n        /// this value will be the snapshot value if one is available or the\n        /// base property value if it is not; otherise this value will be the \n        /// value returned by the previous animation in the chain with an \n        /// animationClock that is not Stopped.\n        /// </param>","sourceCodeStart":259,"sourceCodeEnd":295,"githubUrl":"https://github.com/dotnet/wpf/blob/81131a70a4c573cd62748a5c36908fc4d662daa9/src/Microsoft.DotNet.Wpf/src/PresentationCore/System/Windows/Media/Animation/Generated/ColorAnimationUsingKeyFrames.cs#L259-L295","documentation":"ColorAnimationUsingKeyFrames.AddText always throws InvalidOperationException (SR.Animation_NoTextChildren). Timelines have no text content model, so the IAddChild text path is intentionally unimplemented; the XML doc comment documents that text children are not supported.","triggerScenarios":"Calling AddText(string) directly, or XAML/content parsing that attempts to place a literal text string inside a <ColorAnimationUsingKeyFrames> element.","commonSituations":"Stray whitespace-laden text or a literal value typed inside the animation element in XAML; programmatic code treating the animation as a text-bearing content element.","solutions":["Remove any text content inside the ColorAnimationUsingKeyFrames element in XAML","Express values via key frame child elements instead of text","If building content programmatically, use KeyFrames.Add rather than AddText","Check for accidental characters/whitespace with non-trivial content between XAML tags"],"exampleFix":"// before (XAML)\n<ColorAnimationUsingKeyFrames>Red</ColorAnimationUsingKeyFrames>\n// after (XAML)\n<ColorAnimationUsingKeyFrames>\n  <DiscreteColorKeyFrame KeyTime=\"0:0:1\" Value=\"Red\" />\n</ColorAnimationUsingKeyFrames>","handlingStrategy":"validation","validationCode":"// check before building XAML content\nbool hasTextContent = contentNode is text/whitespace-with-content; // reject before parse","typeGuard":null,"tryCatchPattern":"try { addText(childText); }\ncatch (InvalidOperationException) { /* timelines never accept text; use key frames */ }","preventionTips":["Never place literal text inside animation elements in XAML","Use key frame elements for all values","Trim/inspect XAML for stray characters between tags"],"tags":["wpf","animation","xaml","unsupported-operation"],"backgroundTag":"unsupported-operation","analyzedSha":"81131a70a4c573cd62748a5c36908fc4d662daa9","analyzedAt":"2026-09-14T10:12:48.479Z","contentChangedAt":"2026-09-14T10:12:48.479Z","schemaVersion":2},"datasetVersion":"2026-09-22T01:17:13.364Z"}