RequiredAttribute.IsValid(Object) Method

Reference

Definition

Namespace:: System.ComponentModel.DataAnnotations

Assemblies:: System.ComponentModel.Annotations.dll, System.ComponentModel.DataAnnotations.dll

Assembly:: System.ComponentModel.Annotations.dll

Assembly:: System.ComponentModel.DataAnnotations.dll

Package:: System.ComponentModel.Annotations v5.0.0

Source:: RequiredAttribute.cs

Source:: RequiredAttribute.cs

Source:: RequiredAttribute.cs

Important

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Checks that the value of the required data field is not empty.

public:
 override bool IsValid(System::Object ^ value);

public override bool IsValid(object value);

public override bool IsValid(object? value);

override this.IsValid : obj -> bool

Public Overrides Function IsValid (value As Object) As Boolean

Parameters

value: Object

The data field value to validate.

Returns

Boolean

true if validation is successful; otherwise, false.

Exceptions

ValidationException

The data field value was null.

Remarks

If the value is an empty string, the method returns false and a validation error is displayed.

Applies to

Produkt	Versiounen
.NET	Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9, 10
.NET Framework	3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard	2.0 (package-provided), 2.1 (package-provided)
UWP	10.0

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