DXValidationProvider.ValidationMode Property

Gets or sets the validation mode.

Namespace: DevExpress.XtraEditors.DXErrorProvider

Assembly: DevExpress.XtraEditors.v23.2.dll

NuGet Package: DevExpress.Win.Navigation

Declaration

C#

[DefaultValue(ValidationMode.Default)]
[DXCategory("Behavior")]
public ValidationMode ValidationMode { get; set; }

VB.NET

<DXCategory("Behavior")>
<DefaultValue(ValidationMode.Default)>
Public Property ValidationMode As ValidationMode

Property Value

Type	Default	Description
DevExpress.XtraEditors.DXErrorProvider.ValidationMode	Default	A DevExpress.XtraEditors.DXErrorProvider.ValidationMode enumeration value that specifies the validation mode.

Remarks

By default, automatic checking is disabled. You should manualy invoke the validation mechanism when required. To do this, use the DXValidationProvider.Validate method.

To enable automatic validation, set the ValidationMode property to Auto. In this case, an editor’s value will be automatically checked against the associated validation rule when data must be validated (for instance, when focus moves to another control).

Example

This example demonstrates how to validate data via the DXValidationProvider component. In this example, validation rules (built-in and custom) are created in code, and associated with editors using the DXValidationProvider.SetValidationRule method.

The CustomValidationRule class represents a custom validation rule that checks whether the editor’s value begins with “Dr.”, “Mr.”, “Mrs.”, “Miss” or “Ms.”.

C#

using DevExpress.XtraEditors.DXErrorProvider;

// Validates the editors when a user presses/clicks the OK button.
dxValidationProvider1.ValidationMode = ValidationMode.Manual;

// ...
ConditionValidationRule containsValidationRule = new ConditionValidationRule();
containsValidationRule.ConditionOperator = ConditionOperator.Contains;
containsValidationRule.Value1 = '@';
containsValidationRule.ErrorText = "Please enter a valid email";
containsValidationRule.ErrorType = ErrorType.Warning;

CompareAgainstControlValidationRule compValidationRule = 
    new CompareAgainstControlValidationRule();
compValidationRule.Control = notEmptyTextEdit;
compValidationRule.CompareControlOperator = CompareControlOperator.Equals;
compValidationRule.ErrorText = "Please enter a value that equals to the first editor's value";
compValidationRule.CaseSensitive = true;

CustomValidationRule customValidationRule = new CustomValidationRule();
customValidationRule.ErrorText = "Please enter a valid person name";
customValidationRule.ErrorType = ErrorType.Warning;

dxValidationProvider1.SetValidationRule(containsTextEdit, containsValidationRule);
dxValidationProvider1.SetValidationRule(compareTextEdit, compValidationRule);
dxValidationProvider1.SetValidationRule(customTextEdit, customValidationRule);


private void buttonOk_Click(object sender, EventArgs e) {
    dxValidationProvider1.Validate();
}

// Implements a custom validation rule.
public class CustomValidationRule : ValidationRule {
    public override bool Validate(Control control, object value) {
        string str = (string)value;
        string[] values = new string[] { "Dr.", "Mr.", "Mrs.", "Miss", "Ms." };
        foreach(string val in values) {
            if(ValidationHelper.Validate(str, ConditionOperator.BeginsWith, 
                val, null, null, false)) {
                string name = str.Substring(val.Length);
                if(name.Trim().Length > 0) return true;
            }
        }
        return false;
    }
}

VB.NET

Imports DevExpress.XtraEditors.DXErrorProvider

' Validates the editors when a user presses/clicks the OK button.
dxValidationProvider1.ValidationMode = ValidationMode.Manual
' ...
Dim containsValidationRule As New ConditionValidationRule()
containsValidationRule.ConditionOperator = ConditionOperator.Contains
containsValidationRule.Value1 = "@"
containsValidationRule.ErrorText = "Please enter a valid email"
containsValidationRule.ErrorType = ErrorType.Warning

Dim compValidationRule As New CompareAgainstControlValidationRule()
compValidationRule.Control = notEmptyTextEdit
compValidationRule.CompareControlOperator = CompareControlOperator.Equals
compValidationRule.ErrorText = "Please enter a value that equals to the first editor's value"
compValidationRule.CaseSensitive = True

Dim customValidationRule As New CustomValidationRule()
customValidationRule.ErrorText = "Please enter a valid person name"
customValidationRule.ErrorType = ErrorType.Warning

dxValidationProvider1.SetValidationRule(containsTextEdit, containsValidationRule)
dxValidationProvider1.SetValidationRule(compareTextEdit, compValidationRule)
dxValidationProvider1.SetValidationRule(customTextEdit, customValidationRule)

Private Sub ButtonOK_Click(sender As Object, e As EventArgs) Handles ButtonOK.Click
    dxValidationProvider1.Validate()
End Sub


' Implements a custom validation rule.
Public Class CustomValidationRule
    Inherits ValidationRule

    Public Overrides Function Validate(ByVal control As Control, ByVal value As Object) As Boolean
        Dim str As String = DirectCast(value, String)
        Dim values() As String = { "Dr.", "Mr.", "Mrs.", "Miss", "Ms." }
        For Each val As String In values
            If ValidationHelper.Validate(str, ConditionOperator.BeginsWith, val, Nothing, Nothing, False) Then
                Dim name As String = str.Substring(val.Length)
                If name.Trim().Length > 0 Then
                    Return True
                End If
            End If
        Next val
        Return False
    End Function
End Class