.net - Mimicking Validation Behaviour without Validation -

we have several data objects in our application wind bound grids. have them implementing idataerrorinfo interface, adding error messages properties, see rowheader change style , datagridcells gain red border. , good.

we have additional requirement rather merely having errors, have errors , warnings. warnings identical errors except should produce yellow border instead of red one.

we created new interface, idatawarninginfo, based on idataerrorinfo. works fine. can access @ runtime, have rowvalidatiionrules that able access it, , set yellow row header instead of red one, appropriate tooltip, etc. i'm missing ability set given cell's border yellow, on basis databound property property has warning message.

i retrieve warning message passing name of databound property interface; suspect under hood, validation code doing that. i'm missing how in xaml. specifically, think need apply style cell, style contains datatrigger somehow passes object name of databound property, , if result different null, applies few setters cell.

does know how achieve this?

i have class attached property dependencyproperty validate. uses dependencypropertydescriptor attach event dependencyproperty's change event.

then when changes, looks through bindings, runs validation rules , sets validation errors property without commiting binding.

public static class validatingcontrolbehavior {     /// <summary>     /// defines validatingproperty dependency property.     /// </summary>     public static readonly dependencyproperty validatingpropertyproperty = dependencyproperty.registerattached("validatingproperty", typeof(dependencyproperty), typeof(validatingcontrolbehavior),          new propertymetadata(validatingcontrolbehavior.validatingpropertyproperty_propertychanged));      /// <summary>     /// attaches event.     /// </summary>     /// <param name="control">the control.</param>     /// <param name="dependencyproperty">the dependency property.</param>     private static void attachevent(control control, dependencyproperty dependencyproperty)     {         dependencypropertydescriptor.fromproperty(dependencyproperty, typeof(control)).addvaluechanged(control, validatingcontrolbehavior.control_propertychanged);         control.forcevalidation(dependencyproperty);     }      /// <summary>     /// handles propertychanged event of control control.     /// </summary>     /// <param name="sender">the source of event.</param>     /// <param name="e">the <see cref="system.eventargs"/> instance containing event data.</param>     private static void control_propertychanged(object sender, eventargs e)     {         control control = (control)sender;         control.forcevalidation(validatingcontrolbehavior.getvalidatingproperty(control));     }      /// <summary>     /// forces validation.     /// </summary>     /// <param name="dependencyobject">the dependency object.</param>     /// <param name="dependencyproperty">the dependency property.</param>     private static void forcevalidation(this dependencyobject dependencyobject, dependencyproperty dependencyproperty)     {         bindingexpressionbase expression = bindingoperations.getbindingexpressionbase(dependencyobject, dependencyproperty);         collection<validationrule> validationrules;         if (expression != null)         {             multibinding multibinding;             binding binding = expression.parentbindingbase binding;             if (binding != null)             {                 validationrules = binding.validationrules;             }             else if ((multibinding = expression.parentbindingbase multibinding) != null)             {                 validationrules = multibinding.validationrules;             }             else             {                 return;             }             (int = 0; < validationrules.count; i++)             {                 validationrule rule = validationrules[i];                 validationresult result = rule.validate(dependencyobject.getvalue(dependencyproperty), cultureinfo.currentculture);                 if (!result.isvalid)                 {                     validation.markinvalid(expression, new validationerror(rule, expression.parentbindingbase, result.errorcontent, null));                     return;                 }             }             validation.clearinvalid(expression);         }     }      /// <summary>     /// detaches event.     /// </summary>     /// <param name="control">the control.</param>     /// <param name="dependencyproperty">the dependency property.</param>     private static void detachevent(control control, dependencyproperty dependencyproperty)     {         dependencypropertydescriptor.fromproperty(dependencyproperty, typeof(control)).removevaluechanged(control, validatingcontrolbehavior.control_propertychanged);     }      /// <summary>     /// handles propertychanged event of validatingpropertyproperty control.     /// </summary>     /// <param name="d">the source of event.</param>     /// <param name="e">the <see cref="system.windows.dependencypropertychangedeventargs"/> instance containing event data.</param>     private static void validatingpropertyproperty_propertychanged(dependencyobject d, dependencypropertychangedeventargs e)     {         control control = d control;         if (control != null)         {             if (e.oldvalue != null)             {                 validatingcontrolbehavior.detachevent(control, (dependencyproperty)e.oldvalue);             }             if (e.newvalue != null)             {                 validatingcontrolbehavior.attachevent(control, (dependencyproperty)e.newvalue);             }         }     }      /// <summary>     /// gets validating property.     /// </summary>     /// <param name="control">the control.</param>     /// <returns>     /// dependency property.     /// </returns>     public static dependencyproperty getvalidatingproperty(control control)     {         return (dependencyproperty)control.getvalue(validatingcontrolbehavior.validatingpropertyproperty);     }      /// <summary>     /// sets validating property.     /// </summary>     /// <param name="control">the control.</param>     /// <param name="validatingproperty">the validating property.</param>     public static void setvalidatingproperty(control control, dependencyproperty validatingproperty)     {         control.setvalue(validatingcontrolbehavior.validatingpropertyproperty, validatingproperty);     } }