RingSoft.DataEntryControls.Engine Namespace

CalculatorOperators Enumeration

CalculatorProcessor Class

ControlsGlobals Class

DataEntryModes Enumeration

DataEntryNumericControlProcessor Class

DateEditControlSetup Class

DateFormatTypes Enumeration

DecimalEditControlSetup Class

DecimalEditFormatTypes Enumeration

EnumFieldTranslation Class

ExtensionMethods Class

ICalculatorControl Interface

IControlsUserInterface Interface

IDateEditControl Interface

IDropDownControl Interface

IntegerEditControlSetup Class

INumericControl Interface

MessageBoxButtonsResult Enumeration

NumberSymbolLocations Enumeration

NumericEditControlSetup(T) Class

ProcessCharResults Enumeration

RelayCommand Class

RelayCommand(T) Class

RsMessageBoxIcons Enumeration

TextComboBoxControlSetup Class

TextComboBoxItem Class

TypeTranslation Class

UiCaptionArgs Class

UiCommand Class

UiEnabledArgs Class

UiLostFocusArgs Class

UiReadOnlyArgs Class

UiVisibilityArgs Class

UiVisibilityTypes Enumeration

ValueChangedArgs Class

WindowCursorTypes Enumeration

RingSoft.DataEntryControls.Engine.Annotations Namespace

AspChildControlTypeAttribute Class

AspDataFieldAttribute Class

AspDataFieldsAttribute Class

AspMethodPropertyAttribute Class

AspMvcActionAttribute Class

AspMvcActionSelectorAttribute Class

AspMvcAreaAttribute Class

AspMvcAreaMasterLocationFormatAttribute Class

AspMvcAreaPartialViewLocationFormatAttribute Class

AspMvcAreaViewLocationFormatAttribute Class

AspMvcControllerAttribute Class

AspMvcDisplayTemplateAttribute Class

AspMvcEditorTemplateAttribute Class

AspMvcMasterAttribute Class

AspMvcMasterLocationFormatAttribute Class

AspMvcModelTypeAttribute Class

AspMvcPartialViewAttribute Class

AspMvcPartialViewLocationFormatAttribute Class

AspMvcSuppressViewErrorAttribute Class

AspMvcTemplateAttribute Class

AspMvcViewAttribute Class

AspMvcViewComponentAttribute Class

AspMvcViewComponentViewAttribute Class

AspMvcViewLocationFormatAttribute Class

AspRequiredAttributeAttribute Class

AspTypePropertyAttribute Class

AssertionConditionAttribute Class

AssertionConditionType Enumeration

AssertionMethodAttribute Class

BaseTypeRequiredAttribute Class

CanBeNullAttribute Class

CannotApplyEqualityOperatorAttribute Class

CollectionAccessAttribute Class

CollectionAccessType Enumeration

ContractAnnotationAttribute Class

HtmlAttributeValueAttribute Class

HtmlElementAttributesAttribute Class

ImplicitUseKindFlags Enumeration

ImplicitUseTargetFlags Enumeration

InstantHandleAttribute Class

InvokerParameterNameAttribute Class

ItemCanBeNullAttribute Class

ItemNotNullAttribute Class

LinqTunnelAttribute Class

LocalizationRequiredAttribute Class

MacroAttribute Class

MeansImplicitUseAttribute Class

MustUseReturnValueAttribute Class

NoEnumerationAttribute Class

NonNegativeValueAttribute Class

NoReorderAttribute Class

NotifyPropertyChangedInvocatorAttribute Class

NotNullAttribute Class

PathReferenceAttribute Class

ProvidesContextAttribute Class

PublicAPIAttribute Class

PureAttribute Class

RazorDirectiveAttribute Class

RazorHelperCommonAttribute Class

RazorImportNamespaceAttribute Class

RazorInjectionAttribute Class

RazorLayoutAttribute Class

RazorPageBaseTypeAttribute Class

RazorSectionAttribute Class

RazorWriteLiteralMethodAttribute Class

RazorWriteMethodAttribute Class

RazorWriteMethodParameterAttribute Class

RegexPatternAttribute Class

SourceTemplateAttribute Class

StringFormatMethodAttribute Class

TerminatesProgramAttribute Class

UsedImplicitlyAttribute Class

ValueProviderAttribute Class

ValueRangeAttribute Class

XamlItemBindingOfItemsControlAttribute Class

XamlItemsControlAttribute Class

XamlItemStyleOfItemsControlAttribute Class

RingSoft.DataEntryControls.Engine.DataEntryGrid Namespace

CellLostFocusTypes Enumeration

CellPropsTypes Enumeration

ColumnMap Class

ComboBoxValueChangedTypes Enumeration

DataEntryGridButtonCellProps Class

DataEntryGridButtonCellStyle Class

DataEntryGridCellProps Class

DataEntryGridCellStates Enumeration

DataEntryGridCellStyle Class

DataEntryGridCheckBoxCellProps Class

DataEntryGridComboBoxCellProps Class

DataEntryGridContextMenuItem Class

DataEntryGridControlCellStyle Class

DataEntryGridControlValue Class

DataEntryGridDataValue Class

DataEntryGridDateCellProps Class

DataEntryGridDecimalCellProps Class

DataEntryGridEditingCellProps Class

DataEntryGridIntegerCellProps Class

DataEntryGridManager Class

DataEntryGridMemoValue Class

DataEntryGridRow Class

DataEntryGridTextCellProps Class

DataEntryGridTextComboBoxCellProps Class

GridMemoValueLine Class

IDataEntryGrid Interface

TextCasing Enumeration

RingSoft.DataEntryControls.Engine.DataEntryGrid.CellProps Namespace

DataEntryGridCustomControlCellProps Class

RingSoft.DataEntryControls.Engine.Date Namespace

DateEditProcessor Class

RingSoft.DataEntryControls.WPF Namespace

AspChildControlTypeAttribute Class

AspDataFieldAttribute Class

AspDataFieldsAttribute Class

AspMethodPropertyAttribute Class

AspMvcActionAttribute Class

AspMvcActionSelectorAttribute Class

AspMvcAreaAttribute Class

AspMvcAreaMasterLocationFormatAttribute Class

AspMvcAreaPartialViewLocationFormatAttribute Class

AspMvcAreaViewLocationFormatAttribute Class

AspMvcControllerAttribute Class

AspMvcDisplayTemplateAttribute Class

AspMvcEditorTemplateAttribute Class

AspMvcMasterAttribute Class

AspMvcMasterLocationFormatAttribute Class

AspMvcModelTypeAttribute Class

AspMvcPartialViewAttribute Class

AspMvcPartialViewLocationFormatAttribute Class

AspMvcSuppressViewErrorAttribute Class

AspMvcTemplateAttribute Class

AspMvcViewAttribute Class

AspMvcViewComponentAttribute Class

AspMvcViewComponentViewAttribute Class

AspMvcViewLocationFormatAttribute Class

AspRequiredAttributeAttribute Class

AspTypePropertyAttribute Class

AssertionConditionAttribute Class

AssertionConditionType Enumeration

AssertionMethodAttribute Class

BaseTypeRequiredAttribute Class

BaseWindow Class

Calculator Class

CanBeNullAttribute Class

CannotApplyEqualityOperatorAttribute Class

CollectionAccessAttribute Class

CollectionAccessType Enumeration

ComparisonConverter Class

ContentComboBoxControl Class

ContractAnnotationAttribute Class

ControlsUserInterface Class

CustomContentControl Class

DataEntryCustomContentTemplate Class

DataEntryCustomContentTemplateItem Class

DataEntryMemoEditor Class

DataEntryMemoTabItem Class

DateEditControl Class

DateReadOnlyBox Class

DecimalEditControl Class

DecimalReadOnlyBox Class

DropDownCalendar Class

DropDownEditControl Class

EllipseStartPosition Structure

EnumConverter Class

ExtensionMethods Class

HtmlAttributeValueAttribute Class

HtmlElementAttributesAttribute Class

IDecimalEditControl Interface

ImplicitUseKindFlags Enumeration

ImplicitUseTargetFlags Enumeration

InstantHandleAttribute Class

IntegerEditControl Class

InvokerParameterNameAttribute Class

IReadOnlyControl Interface

ItemCanBeNullAttribute Class

ItemNotNullAttribute Class

LinqTunnelAttribute Class

LocalizationRequiredAttribute Class

MacroAttribute Class

MapType Enumeration

MeansImplicitUseAttribute Class

MustUseReturnValueAttribute Class

NoEnumerationAttribute Class

NonNegativeValueAttribute Class

NoReorderAttribute Class

NotificationButton Class

NotifyPropertyChangedInvocatorAttribute Class

NotNullAttribute Class

NumericEditControl(T) Class

NumericReadOnlyBox(T) Class

PathReferenceAttribute Class

ProvidesContextAttribute Class

PublicAPIAttribute Class

PureAttribute Class

RazorDirectiveAttribute Class

RazorHelperCommonAttribute Class

RazorImportNamespaceAttribute Class

RazorInjectionAttribute Class

RazorLayoutAttribute Class

RazorPageBaseTypeAttribute Class

RazorSectionAttribute Class

RazorWriteLiteralMethodAttribute Class

RazorWriteMethodAttribute Class

RazorWriteMethodParameterAttribute Class

ReadOnlyBox Class

RegexPatternAttribute Class

SourceTemplateAttribute Class

StringEditControl Class

StringFormatMethodAttribute Class

StringReadOnlyBox Class

TerminatesProgramAttribute Class

TextComboBoxControl Class

UsedImplicitlyAttribute Class

ValueProviderAttribute Class

ValueRangeAttribute Class

ValueToForegroundColorConverterGreen Class

ValueToForegroundConverter Class

ValueToForegroundParameter Class

VmUiControl Class

VmUiControlFactory Class

WaitSpinner Class

WPFControlsGlobals Class

XamlItemBindingOfItemsControlAttribute Class

XamlItemsControlAttribute Class

XamlItemStyleOfItemsControlAttribute Class

RingSoft.DataEntryControls.WPF.DataEntryGrid Namespace

ControlValueChangedArgs Class

DataEntryGrid Class

DataEntryGridButton Class

DataEntryGridButtonColumn Class

DataEntryGridCheckBox Class

DataEntryGridCheckBoxColumn Class

DataEntryGridColumn Class

DataEntryGridColumnTypes Enumeration

DataEntryGridContentComboBoxControlHost Class

DataEntryGridControlColumn(TControl) Class

DataEntryGridControlColumnProcessor Class

DataEntryGridCustomControl Class

DataEntryGridCustomControlColumn Class

DataEntryGridDisplayStyle Class

DataEntryGridMemoEditor Class

DataEntryGridTextColumn Class

RingSoft.DataEntryControls.WPF.DataEntryGrid.EditingControlHost Namespace

DataEntryGridButtonHost Class

DataEntryGridCheckBoxHost Class

DataEntryGridComboBoxHost(TControl) Class

DataEntryGridDateHost Class

DataEntryGridDecimalControlHost Class

DataEntryGridDropDownControlHost(TDropDownControl) Class

DataEntryGridEditingControlHost(TControl) Class

DataEntryGridEditingControlHostBase Class

DataEntryGridHostFactory Class

DataEntryGridIntegerControlHost Class

DataEntryGridTextBoxHost Class

DataEntryGridTextComboBoxHost Class

RingSoft.DataEntryControls.WPF.DropDownEditControls Namespace

IDropDownCalculator Interface

IDropDownCalendar Interface

CanBeNullAttribute Class

Indicates that the value of the marked element could be null sometimes, so checking for null is required before its usage.

Namespace: RingSoft.DataEntryControls.Engine.Annotations
Assembly: RingSoft.DataEntryControls.Engine (in RingSoft.DataEntryControls.Engine.dll)

Syntax

[AttributeUsageAttribute]
public sealed class CanBeNullAttribute : Attribute

<AttributeUsageAttribute> _
Public NotInheritable Class CanBeNullAttribute _
	Inherits Attribute

[AttributeUsageAttribute]
public ref class CanBeNullAttribute sealed : public Attribute

Examples

C#

[CanBeNull] object Test() => null;
void UseTest() {
var p = Test();
var s = p.ToString(); // Warning: Possible 'System.NullReferenceException'
}

Inheritance Hierarchy

Object
Attribute
RingSoft.DataEntryControls.Engine.Annotations..::..CanBeNullAttribute

See Also

RingSoft.DataEntryControls.Engine.Annotations Namespace