Class Validation

Provides methods and attached properties that support data validation and govern the visual state of the control.

Inheritance

System.Object

Validation

Inherited Members

System.Object.Equals(System.Object)

System.Object.Equals(System.Object, System.Object)

System.Object.GetHashCode()

System.Object.GetType()

System.Object.MemberwiseClone()

System.Object.ReferenceEquals(System.Object, System.Object)

System.Object.ToString()

Namespace: System.Windows.Controls

Assembly: OpenSilver.dll

Syntax

public static class Validation

Fields

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ErrorsProperty

Identifies the Validation Errors attached property.

Declaration

public static readonly DependencyProperty ErrorsProperty

Field Value

Type	Description
DependencyProperty

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HasErrorProperty

Identifies the Validation HasError attached property.

Declaration

public static readonly DependencyProperty HasErrorProperty

Field Value

Type	Description
DependencyProperty

Methods

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ClearInvalid(BindingExpression)

Clears the ValidationError that was set through a call to MarkInvalid or a previously failed validation of that BindingExpression.

Declaration

public static void ClearInvalid(BindingExpression bindingExpression)

Parameters

Type	Name	Description
BindingExpression	bindingExpression	The object to turn valid.

Exceptions

Type	Condition
System.ArgumentNullException	bindingExpression is null.

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GetErrors(DependencyObject)

Gets the value of the Validation Errors attached property of the specified element.

Declaration

public static ReadOnlyObservableCollection<ValidationError> GetErrors(DependencyObject element)

Parameters

Type	Name	Description
DependencyObject	element	The UIElement object to read the value from.

Returns

Type	Description
System.Collections.ObjectModel.ReadOnlyObservableCollection<ValidationError>	A System.Collections.ObjectModel.ReadOnlyObservableCollection<T>.

Exceptions

Type	Condition
System.ArgumentNullException	element is null.

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GetHasError(DependencyObject)

Gets the value of the Validation HasError attached property of the specified element.

Declaration

public static bool GetHasError(DependencyObject element)

Parameters

Type	Name	Description
DependencyObject	element	The UIElement object to read the value from.

Returns

Type	Description
System.Boolean	The value of the Validation HasError attached property of the specified element.

Exceptions

Type	Condition
System.ArgumentNullException	element is null.

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MarkInvalid(BindingExpression, ValidationError)

Mark this BindingExpression as invalid. If the BindingExpression has been explicitly marked invalid in this way, then it will remain invalid until ClearInvalid is called or another transfer to the source validates successfully.

Declaration

public static void MarkInvalid(BindingExpression bindingExpression, ValidationError validationError)

Parameters

Type	Name	Description
BindingExpression	bindingExpression	The BindingExpression object to mark as invalid.
ValidationError	validationError	The ValidationError object to use.

Exceptions

Type	Condition
System.ArgumentNullException	bindingExpression is null or validationError is null.