{"record":{"id":"c8d2c5dd802a7bcd","repo":"lepoco/wpfui","slug":"failed-to-get-the-current-desiredwidth","errorCode":null,"errorMessage":"Failed to get the current `_desiredWidth`.","messagePattern":"Failed to get the current `_desiredWidth`\\.","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"src/Wpf.Ui/Controls/GridView/GridViewColumn.cs","lineNumber":67,"sourceCode":"        return methodInfo;\n    });\n\n    private static MethodInfo UpdateActualWidthMethod => _updateActualWidthMethod.Value;\n\n    /// <summary>\n    /// Updates the desired width of the column to be clamped between MinWidth and MaxWidth).\n    /// </summary>\n    /// <remarks>\n    /// Uses reflection to directly set the private `_desiredWidth` field on the `System.Windows.Controls.GridViewColumn`.\n    /// </remarks>\n    /// <exception cref=\"InvalidOperationException\">\n    /// Thrown if reflection fails to access the `_desiredWidth` field\n    /// </exception>\n    internal void UpdateDesiredWidth()\n    {\n        double currentWidth = (double)(\n            DesiredWidthField.GetValue(this)\n            ?? throw new InvalidOperationException(\"Failed to get the current `_desiredWidth`.\")\n        );\n        double clampedWidth = Math.Max(MinWidth, Math.Min(currentWidth, MaxWidth));\n        DesiredWidthField.SetValue(this, clampedWidth);\n        _ = UpdateActualWidthMethod.Invoke(this, null);\n    }\n\n    /// <summary>\n    /// Gets or sets the minimum width of the column.\n    /// </summary>\n    public double MinWidth\n    {\n        get => (double)GetValue(MinWidthProperty);\n        set => SetValue(MinWidthProperty, value);\n    }\n\n    /// <summary>Identifies the <see cref=\"MinWidth\"/> dependency property.</summary>\n    public static readonly DependencyProperty MinWidthProperty = DependencyProperty.Register(\n        nameof(MinWidth),","sourceCodeStart":49,"sourceCodeEnd":85,"githubUrl":"https://github.com/lepoco/wpfui/blob/ffebacd61058170cf63864b7d5aa730cffff848a/src/Wpf.Ui/Controls/GridView/GridViewColumn.cs#L49-L85","documentation":"Thrown by GridViewColumn.UpdateDesiredWidth when FieldInfo.GetValue returns null for the '_desiredWidth' field on a live column instance. In practice the field is a double and should never box to null, so this guard fires only if reflection retrieved the field but the runtime returned null — e.g. the field is a nullable backing or there is an unload/teardown race. It is a defensive integrity check.","triggerScenarios":"Calling UpdateDesiredWidth on a column whose underlying _desiredWidth field value is reported as null by reflection; the column is in an inconsistent state during teardown; the field exists but holds a non-double (null) due to runtime corruption.","commonSituations":"Column being measured/updated during window close while the GridView is being detached; very rare runtime/Reflection edge case; interaction with a custom GridViewColumn subclass.","solutions":["Avoid calling UpdateDesiredWidth during teardown — defer or cancel width updates when the control is unloading.","Reproduce on the stock runtime the library targets; if reproducible only on a newer runtime, treat as a version break (see errors 24/25).","If subclassing, do not bypass the base measure pipeline that keeps _desiredWidth populated.","Report upstream with the runtime version and a minimal repro if the field is genuinely null under normal use."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"try { col.UpdateDesiredWidth(); }\ncatch (InvalidOperationException ex) when (ex.Message.Contains(\"Failed to get the current\"))\n{\n    // Column in teardown/inconsistent state; skip the clamp\n    Logger.Warn($\"Skipping width clamp, field value null: {ex.Message}\");\n}","preventionTips":["Do not invoke UpdateDesiredWidth during window/control unload.","Cancel pending layout updates when the GridView is detaching.","If reproducible on a stock runtime, report upstream with version info."],"tags":["wpf","gridview","reflection","defensive-guard","lifecycle"],"backgroundTag":null,"analyzedSha":"ffebacd61058170cf63864b7d5aa730cffff848a","analyzedAt":"2026-08-13T21:36:01.370Z","schemaVersion":2},"datasetVersion":"2026-08-14T05:17:29.042Z"}