How to change TextEdit border color during user input validation

Question

How to change TextEdit border color in WPF form during user input validation using DevExpress

I have item in my form:

<dxe:TextEdit x:Name="txtTextEdit"
 Text="{Binding FilterField, 
 UpdateSourceTrigger=PropertyChanged}"
 ValidateOnTextInput="False"
 Validate="txtValidate"/>

Also created void to validate this field:

private void txtValidate(object sender, DevExpress.Xpf.Editors.ValidationEventArgs e)


{
if (e.Value == null) return;
if (e.Value.ToString().Length > 4) return;
e.IsValid = false;
e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Warning;
e.ErrorContent = "Enter more than 4 symbols";
}   

And how to change border color instead of showing error?

Answer 1

<Border BorderBrush="{Binding MyBorderBrush}">
<dxe:TextEdit x:Name="txtTextEdit"
 Text="{Binding FilterField, 
 UpdateSourceTrigger=PropertyChanged}"
 ValidateOnTextInput="False"
 Validate="txtValidate"/>
</Border>

and this in the method,

e.IsValid = false;
e.ErrorType = DevExpress.XtraEditors.DXErrorProvider.ErrorType.Warning;
e.ErrorContent = "Enter more than 4 symbols";
MyBorderBrush = Brushes.Red;

MyBorderBrush is property. You need to define proper binding. Its datatype should be of Brush which is from System.Windows.Controls. You need to use this library.