RuleRequiredFieldAttribute(String, DefaultContexts) Constructor

Initializes a new instance of the RuleRequiredFieldAttribute class.

Namespace: DevExpress.Persistent.Validation

Assembly: DevExpress.Persistent.Base.v24.2.dll

NuGet Package: DevExpress.Persistent.Base

Declaration

C#

public RuleRequiredFieldAttribute(
    string id,
    DefaultContexts targetContexts
)

VB.NET

Public Sub New(
    id As String,
    targetContexts As DefaultContexts
)

Parameters

Name	Type	Description
id	String	A string value representing the current rule identifier. You can pass an empty value as the id parameter. An appropriate identifier will begenerated automatically, and set for the ID property of the Validation | Rules | Rule node in the Application Model.
targetContexts	DefaultContexts	A DefaultContexts enumeration value that specifies a context for checking the current rule. This value is set for the RuleBaseAttribute.TargetContextIDs property.

Remarks

If you are going to set a custom message template instead of a default one, use a constructor with the messageTemplate parameter.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the RuleRequiredFieldAttribute(String, DefaultContexts) constructor.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

xaf-how-to-implement-a-security-system-user-based-on-an-existing-business-class/CS/EmployeeAsUserExample.Module/BusinessObjects/Employee.cs#L30

private string userName = String.Empty;
[RuleRequiredField("EmployeeUserNameRequired", DefaultContexts.Save)]
[RuleUniqueValue("EmployeeUserNameIsUnique", DefaultContexts.Save,

XAF_how-to-set-validation-rules-in-code-e249/CS/HowToSetValidationRulesInCode.Module/Incident.cs#L20

private string subject;
[RuleRequiredField("RuleRequiredField for Incident.Subject", DefaultContexts.Save)]
public string Subject {

VB.NET

xaf-how-to-implement-a-security-system-user-based-on-an-existing-business-class/VB/EmployeeAsUserExample.Module/BusinessObjects/Employee.vb#L39

    End Property
    <RuleRequiredField("EmployeeUserNameRequired", DefaultContexts.Save),
RuleUniqueValue("EmployeeUserNameIsUnique", DefaultContexts.Save,

XAF_how-to-set-validation-rules-in-code-e249/VB/HowToSetValidationRulesInCode.Module/Incident.vb#L19

Private _subject As String
<RuleRequiredField("RuleRequiredField for Incident.Subject", DefaultContexts.Save)>
Public Property Subject() As String