wpf-devexpress-dot-xpf-dot-editors-dot-validationeventargs-dot-seterror-x28-system-dot-object-x29.md
Marks the processed input value as invalid and displays an error within the editor.
Namespace : DevExpress.Xpf.Editors
Assembly : DevExpress.Xpf.Core.v25.2.dll
NuGet Package : DevExpress.Wpf.Core
public void SetError(
object errorContent
)
Public Sub SetError(
errorContent As Object
)
| Name | Type | Description |
|---|---|---|
| errorContent | Object |
An object that specifies the error content.
|
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.
private void textEdit_Validate(object sender, ValidationEventArgs e) {
if(Convert.ToDouble(e.Value) < 0)
e.SetError("Negative values are not allowed.");
}
Private Sub textEdit_Validate(ByVal sender As Object, ByVal e As ValidationEventArgs)
If Convert.ToDouble(e.Value) < 0 Then
e.SetError("Negative values are not allowed.")
End If
End Sub
The image below shows the result:
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the SetError(Object) method.
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.
wpf-data-grid-validate-data-rows/CS/ValidateRow_CodeBehind/MainWindow.xaml.cs#L59
if(task.StartDate > task.EndDate)
e.SetError("Start Date must be less than End Date");
if(string.IsNullOrEmpty(task.TaskName))
wpf-data-grid-validate-data-rows/VB/ValidateRow_CodeBehind/MainWindow.xaml.vb#L50
Dim task = CType(e.Row, Task)
If task.StartDate > task.EndDate Then e.SetError("Start Date must be less than End Date")
If String.IsNullOrEmpty(task.TaskName) Then e.SetError("Enter a task name")
See Also