DXValidationProvider.ValidationMode Property

Gets or sets the validation mode.

Namespace: DevExpress.XtraEditors.DXErrorProvider

Assembly: DevExpress.XtraEditors.v19.2.dll

Declaration

C#

[DXCategory("Behavior")]
[DefaultValue(ValidationMode.Default)]
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;

// Validate editors manually (when the OK button is clicked)
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();
}

// Represents 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." };
        bool res = false;
        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) res = true;
            }
        }
        return res;
    }
}

VB.NET

Imports DevExpress.XtraEditors.DXErrorProvider

' Validate editors manually (when the OK button is clicked)
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


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

   Public Overrides Function Validate(control As Control, value As Object) As Boolean
      Dim str As String = CStr(value)
      Dim values() As String = {"Dr.", "Mr.", "Mrs.", "Miss", "Ms."}
      Dim res As Boolean = False
      Dim val As String
      For Each val 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
               res = True
            End If
         End If
      Next val
      Return res
   End Function
End Class

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the ValidationMode property.

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#

how-to-use-dxvalidationprovider-with-standard-controls-e4329/CS/CustomValidationProvider/Form1.cs#L31

dxValidationProvider.ValidationMode = DevExpress.XtraEditors.DXErrorProvider.ValidationMode.Auto;
dxValidationProvider.SetValidationRule(maskedTextBox1, compValidationRule);

events-of-successful-validation-for-dxvalidationprovider-e2453/CS/ValidationProviderSuccessEvent/Form1.cs#L17

MyValidationProvider prov = new MyValidationProvider();
prov.ValidationMode = ValidationMode.Auto;
prov.ValidationSuccessfullyComplete += OnValidationSuccessfullyComplete;

VB.NET

how-to-use-dxvalidationprovider-with-standard-controls-e4329/VB/CustomValidationProvider/Form1.vb#L33

dxValidationProvider.ValidationMode = DevExpress.XtraEditors.DXErrorProvider.ValidationMode.Auto
dxValidationProvider.SetValidationRule(maskedTextBox1, compValidationRule)

events-of-successful-validation-for-dxvalidationprovider-e2453/VB/ValidationProviderSuccessEvent/Form1.vb#L15

Dim prov As New MyValidationProvider()
prov.ValidationMode = ValidationMode.Auto
AddHandler prov.ValidationSuccessfullyComplete, AddressOf OnValidationSuccessfullyComplete