查找 TextBox 对象中非法数据的示例

private void GetErrors(StringBuilder sb, DependencyObject obj){
            foreach (object child in LogicalTreeHelper.GetChildren(obj)){
                TextBox element = child as TextBox;
                if (element == null)
                    continue;
                if (Validation.GetHasError(element)){
                    sb.Append(element.Text + " has errors:
");
                    foreach (ValidationError error in Validation.GetErrors(element)){
                        sb.Append(" " + error.ErrorContent.ToString());
                        sb.Append("
");
                    }
                }
            }
        }

        private bool FromHasErrors(out string message){
            StringBuilder sb = new StringBuilder();
            GetErrors(sb, stackProductDetails);
            message = sb.ToString();
            return message != "";
        }

        private void cmdOK_Click(object sender, RoutedEventArgs e){
            string message;
            if (FromHasErrors(out message)){
                MessageBox.Show(message);
            }
            else{
                // ...
            }
        }
    }

 http://blog.csdn.net/iHuoBaby/article/details/8576165