ValidationEventArgs.SetError(Object, ErrorType) Method

Marks the processed input value as invalid and displays an error within the editor with the specified error icon type.

Namespace: DevExpress.Xpf.Editors

Assembly: DevExpress.Xpf.Core.v24.2.dll

NuGet Package: DevExpress.Wpf.Core

Declaration

C#

public void SetError(
    object errorContent,
    ErrorType errorType
)

VB.NET

Public Sub SetError(
    errorContent As Object,
    errorType As ErrorType
)

Parameters

Name	Type	Description
errorContent	Object	An object that specifies the error content.
errorType	ErrorType	One of the ErrorType enumeration values.

Remarks

The SetError method automatically sets the ValidationEventArgs.IsValid property to false. If the errorContent parameter is set to an empty string or null, the ValidationEventArgs.IsValid property is set to true and the error isn’t displayed.

C#

using System;
using DevExpress.Xpf.Editors;
using DevExpress.XtraEditors.DXErrorProvider;
//...
private void textEdit_Validate(object sender, ValidationEventArgs e) {
    if(Convert.ToDouble(e.Value) <= 0)
        e.SetError("Negative values are not allowed. Please correct.", ErrorType.Critical);
}

The image below shows the result: