From 66ee0039e55af5044402378f79a7765a219fae40 Mon Sep 17 00:00:00 2001
From: Christian Arenas <carenas@plainconcepts.com>
Date: Wed, 5 Jul 2017 13:37:06 +0200
Subject: [PATCH] Add StringNullOrEmptyBoolConverter to check when string value
 is null or empty

---
 .../eShopOnContainers.Core/App.xaml           |  1 +
 .../StringNullOrEmptyBoolConverter.cs         | 21 +++++++++++++++++++
 2 files changed, 22 insertions(+)
 create mode 100644 src/Mobile/eShopOnContainers/eShopOnContainers.Core/Converters/StringNullOrEmptyBoolConverter.cs

diff --git a/src/Mobile/eShopOnContainers/eShopOnContainers.Core/App.xaml b/src/Mobile/eShopOnContainers/eShopOnContainers.Core/App.xaml
index 150b01c90..b8acbf952 100644
--- a/src/Mobile/eShopOnContainers/eShopOnContainers.Core/App.xaml
+++ b/src/Mobile/eShopOnContainers/eShopOnContainers.Core/App.xaml
@@ -110,6 +110,7 @@
             <converters:ToUpperConverter x:Key="ToUpperConverter" />
             <converters:WebNavigatingEventArgsConverter x:Key="WebNavigatingEventArgsConverter" />
             <converters:WebNavigatedEventArgsConverter x:Key="WebNavigatedEventArgsConverter" />
+            <converters:StringNullOrEmptyBoolConverter x:Key="StringNullOrEmptyBoolConverter" />
 
             <!-- STYLES -->
             <Style x:Key="ValidationErrorLabelStyle"
diff --git a/src/Mobile/eShopOnContainers/eShopOnContainers.Core/Converters/StringNullOrEmptyBoolConverter.cs b/src/Mobile/eShopOnContainers/eShopOnContainers.Core/Converters/StringNullOrEmptyBoolConverter.cs
new file mode 100644
index 000000000..eb7b12e10
--- /dev/null
+++ b/src/Mobile/eShopOnContainers/eShopOnContainers.Core/Converters/StringNullOrEmptyBoolConverter.cs
@@ -0,0 +1,21 @@
+using System;
+using System.Globalization;
+using Xamarin.Forms;
+
+namespace eShopOnContainers.Core.Converters
+{
+    public class StringNullOrEmptyBoolConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var stringValue = value as string;
+
+            return !string.IsNullOrEmpty(stringValue);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            return null;
+        }
+    }
+}