WPF Binding and Validation -

i have issue validation in wpf can't seem resolve. have class (that implements idataerrorinfo) uses property like-so.

private double? _sizesearchvalue; public double? sizesearchvalue {   { return _sizesearchvalue; }   set   {     _sizesearchvalue = value;     notifychange("sizesearchvalue");     validateinputrow("sizesearchvalue");   } } 

it bound textbox in xaml this.

      <stackpanel orientation="horizontal">         <textblock verticalalignment="center"  text="size:"/>         <combobox text="{binding sizesearchoption, validatesondataerrors=true}"/>         <textbox text="{binding sizesearchvalue, validatesondataerrors=true, updatesourcetrigger=propertychanged, validatesonexceptions=false}"/>       </stackpanel> 

the validateinputrow() function in property setter go through , run custom validation routines , set errors appropriately combobox , textbox in stackpanel mention above have red border. works fine until put non-numeric string textbox ("abc" example.)

with string input binding runs default validation, formatexception raised , textbox gets red border per usual. problem custom validation routine never run because property setter in class never called.

i understand why happening, wondering if knew way catch event, or offending formatexception can run custom validation after fact. can't seem figure 1 out.

ok, looks answered own question. looked further formatexception stack trace , found 'ivalueconverter' involved in process so..... solution use converter so:

<textbox text="{binding sizesearchvalue, validatesondataerrors=true, updatesourcetrigger=propertychanged, converter={staticresource testconverter}}"/> 

in case whipped 1 (testconverter) real quick , tied custom validation rules. problem solved. wonder if there equivalent solutions problem?