Using the validation context
The *ViewModelBase* derives from *ModelBase*, thus all information here also applies to the *ViewModelBase*
Sometimes detailed information about validation is required. This is possible in Catel thanks to the ValidationContext class. The ValidationContext serves as the container for all validation results that are gathered via the available validation methods. The ValidationContext has lots of methods that all return lists of either IFieldValidationResult or IBusinessRuleValidationResult.
The examples below are shown a starter examples, but you can gather every type of validation result by using the ValidationContext. To retrieve the validation context of an object, use the following code:
var modelValidation = new MyViewModel() as IModelValidation; var validationContext = modelValidation.ValidationContext;
Getting the number of or warnings and errors
To retrieve the total number of warnings and errors, use the following code:
int count = validationContext.GetValidationCount();
Getting all the field errors
To retrieve all the field errors, use the following code:
var fieldErrors = validationContext.GetFieldErrors();
Getting all the field errors of a specific property
To retrieve all the field errors of a specific property, use the following code:
var fieldErrors = validationContext.GetFieldErrors("MyProperty");
Getting all the business rule warnings
To retrieve all the business rule warnings:
var businessRuleWarnings = validationContext.GetBusinessRuleWarnings();
Getting all the business rule errors with a specific tag
To retrieve all the business rule errors with a specific tag, use the following code:
var businessRuleErrors = validationContext.GetBusinessRuleErrors("myTag");
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