From 410702da5ba56ec4bbed295d6eedf2496dffc7a3 Mon Sep 17 00:00:00 2001
From: Jurjen Biewenga <j.f.biewenga@gmail.com>
Date: Mon, 16 Oct 2017 11:01:59 +0200
Subject: [PATCH] Added array that is used to filter out certain characters the
 input to the textbox

---
 src/Avalonia.Controls/TextBox.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/Avalonia.Controls/TextBox.cs b/src/Avalonia.Controls/TextBox.cs
index 92ab12f82e..7b6d5ac52e 100644
--- a/src/Avalonia.Controls/TextBox.cs
+++ b/src/Avalonia.Controls/TextBox.cs
@@ -97,6 +97,7 @@ namespace Avalonia.Controls
         private UndoRedoHelper<UndoRedoState> _undoRedoHelper;
         private bool _ignoreTextChanges;
         private IEnumerable<Exception> _dataValidationErrors;
+        private string[] invalidCharacters = new String[1]{""};
 
         static TextBox()
         {
@@ -280,6 +281,7 @@ namespace Avalonia.Controls
         {
             if (!IsReadOnly)
             {
+                input = RemoveInvalidCharacters(input);
                 string text = Text ?? string.Empty;
                 int caretIndex = CaretIndex;
                 if (!string.IsNullOrEmpty(input))
@@ -295,6 +297,16 @@ namespace Avalonia.Controls
             }
         }
 
+        public string RemoveInvalidCharacters(string text)
+        {
+            for (var i = 0; i < invalidCharacters.Length; i++)
+            {
+                text = text.Replace(invalidCharacters[i], string.Empty);
+            }
+
+            return text;
+        }
+
         private async void Copy()
         {
             await ((IClipboard)AvaloniaLocator.Current.GetService(typeof(IClipboard)))