public void ApplyRuleFor <TProperty>(Expression <Func <TModel, TProperty> > expression,
AppValidationAttribute validationAttribute)
{
var errorMsg = validationAttribute.ErrorMessage;
switch (validationAttribute)
{
case RequiredAttribute requiredAttribute:
{
var requiredRule = RuleFor(expression).NotEmpty().WithMessage("This field is required.");
SetRuleErrorMessage(requiredRule, errorMsg);
break;
}
case StringLengthAttribute stringLengthAttribute when expression.ReturnType == typeof(string):
var stringLengthMinLengthRule = RuleFor(expression as Expression <Func <TModel, string> >)
.MinimumLength(stringLengthAttribute.MinimumLength);
SetRuleErrorMessage(stringLengthMinLengthRule, errorMsg);
var stringLengthMaxLengthRule = RuleFor(expression as Expression <Func <TModel, string> >)
.MaximumLength(stringLengthAttribute.MaximumLength);
SetRuleErrorMessage(stringLengthMaxLengthRule, errorMsg);
break;
}
}
private void ApplyRuleForProperty(PropertyInfo property, AppValidationAttribute validationAttribute)
{
var methodInfo = GetType().GetMethod(nameof(ApplyRuleFor));
var argumentTypes = new[] { property.PropertyType };
var genericMethod = methodInfo.MakeGenericMethod(argumentTypes);
var propertyExpression = ExpressionHelper.CreateMemberExpressionForProperty <TModel>(property);
genericMethod.Invoke(this, new[] {
propertyExpression, validationAttribute
});
}