ErrLookup › lepoco/wpfui
lepoco/wpfui
WPF UI provides the Fluent experience in your known and loved WPF framework. Intuitive design, themes, navigation and new immersive controls. All natively and effortlessly. · C# · 654 source files
Analyzed at ffebacd610 on 2026-08-13. 48 documented errors.
| Code / Message | Type | Severity | Tags |
|---|---|---|---|
| Failed to create instance of the page | exception | error | navigation, reflection, instantiation, wpf |
| Unsupported button type | exception | error | titlebar, enum, argument-out-of-range, wpf |
| The page does not have a parameterless constructor or the… | exception | error | dependency-injection, navigation, activator, wpf |
| Unable to find the base directory of the application. | exception | critical | startup, configuration, generic-host, wpf |
| Use | exception | error | wpf, iconelement, misuse, visual-tree, xaml |
| must implement | exception | error | numberbox, validation, formatter, wpf |
| Unable to get or create instance of | exception | error | wpf, navigationview, reflection, activator, configuration |
| returned null | exception | error | wpf, navigationview, dependency-injection, cache, configuration |
| Cannot apply backdrop effect if ExtendsContentIntoTitleBar… | exception | error | wpf, fluentwindow, backdrop, configuration, windows-11 |
| Could not determine the working directory. | exception | error | font-mapper, path, single-file, tooling |
| Element of type not found in | exception | error | template-parts, splitbutton, control-template, wpf |
| Template part ' ' is not found or is not of type | exception | error | template-parts, titlebar, control-template, wpf |
| The `_desiredWidth` field was not found. | exception | critical | wpf, gridview, reflection, version-compatibility, internals |
| dpiScale is not initialized. | exception | error | titlebar, dpi, race-condition, wpf |
| Failed to get the current `_desiredWidth`. | exception | error | wpf, gridview, reflection, defensive-guard, lifecycle |
| The `UpdateActualWidth` method was not found. | exception | critical | wpf, gridview, reflection, version-compatibility, internals |
| Window is null | exception | error | titlebar, window, visual-tree, wpf |
| Unsupported action | exception | warning | wpf, navigationview, defensive-guard, exhaustive-switch |
| The argument must be >= 0 and < the number of items. | exception | error | virtualization, wrap-panel, argument-out-of-range, wpf |
| PageType of the must be derived from . is not. | exception | error | navigation, type-validation, activator, wpf |
| IconElement should have only 1 child | exception | error | wpf, iconelement, visual-tree, subclass-contract |
| Only one ContentDialogHost instance is allowed per Window. | exception | error | wpf, contentdialog, configuration, singleton |
| Use with MessageBoxResult instead | exception | error | wpf, messagebox, api-misuse, obsolete, lifecycle |
| Expected either ' ' or ' ' but got ' '. | exception | error | wpf, iconelement, coerce, type-mismatch, xaml |
| The page does not have a parameterless constructor. If you… | exception | error | navigation, reflection, activator, wpf |
| Cannot change DialogHostEx while the dialog is being shown. | exception | error | wpf, contentdialog, state-violation, ui-thread |
| page not found. | exception | error | navigation, page-provider, navigation-exception, wpf |
| ExceptionEnumToBooleanConverterParameterMustBeAnEnumName | exception | error | xaml, binding, converter, enum |
| The SnackbarPresenter was never set | exception | error | snackbar, initialization, service, wpf |
| Use instead | exception | error | wpf, messagebox, api-misuse, obsolete |
| is not type | exception | error | converter, enum, converterparameter, wpf |
| ExceptionEnumToBooleanConverterValueMustBeAnEnum | exception | error | xaml, binding, converter, enum |
| The . property cannot be null. | exception | error | wpf, navigationview, configuration, precondition |
| . returned null for type . | exception | error | wpf, navigationview, dependency-injection, configuration |
| Window handle cannot be empty | exception | warning | dead-code, hwnd, maintenance |
| Cannot set ContentDialogHost: a legacy ContentPresenter… | exception | error | content-dialog, host, api-migration, obsolete |
| The DialogHost is not the same as the one that was… | exception | error | content-dialog, host, showasync, reference-mismatch |
| Cannot set ContentPresenter: a ContentDialogHost host has… | exception | error | content-dialog, host, api-migration, obsolete |
| DialogHost was not set | exception | error | wpf, contentdialog, configuration, precondition |
| Could not get window handle. | exception | error | hwnd, interop, window, lifecycle |
| IsFocusInsideDialog can only be called from the UI thread. | exception | error | content-dialog, thread-affinity, dispatcher, focus |
| Cannot set DialogHostEx when DialogHost is already set. | exception | error | content-dialog, host, api-migration, obsolete |
| Unable to determine the window source. | exception | error | hwnd, interop, window, wpf |
| Cannot set DialogHost when DialogHostEx is already set. | exception | error | content-dialog, host, api-migration, obsolete |
| Item content is null | exception | error | breadcrumbbar, xaml, command, null-argument |
| Cannot change DialogHost while the dialog is being shown. | exception | error | content-dialog, host, showasync, state-mutation |
| You cannot unwatch a window that is not yet loaded. | exception | error | hwnd, lifecycle, window, unwatch |
| The DialogHost was never set. | exception | error | content-dialog, host, showasync, configuration |