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Diffstat (limited to 'Xamarin.Forms.Core/ReadOnlyCastingList.cs')
-rw-r--r--Xamarin.Forms.Core/ReadOnlyCastingList.cs35
1 files changed, 35 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/ReadOnlyCastingList.cs b/Xamarin.Forms.Core/ReadOnlyCastingList.cs
new file mode 100644
index 00000000..a3f880c3
--- /dev/null
+++ b/Xamarin.Forms.Core/ReadOnlyCastingList.cs
@@ -0,0 +1,35 @@
+using System.Collections;
+using System.Collections.Generic;
+
+namespace Xamarin.Forms
+{
+ internal class ReadOnlyCastingList<T, TFrom> : IReadOnlyList<T> where T : class where TFrom : class
+ {
+ readonly IList<TFrom> _list;
+
+ public ReadOnlyCastingList(IList<TFrom> list)
+ {
+ _list = list;
+ }
+
+ IEnumerator IEnumerable.GetEnumerator()
+ {
+ return ((IEnumerable)_list).GetEnumerator();
+ }
+
+ public IEnumerator<T> GetEnumerator()
+ {
+ return new CastingEnumerator<T, TFrom>(_list.GetEnumerator());
+ }
+
+ public int Count
+ {
+ get { return _list.Count; }
+ }
+
+ public T this[int index]
+ {
+ get { return _list[index] as T; }
+ }
+ }
+} \ No newline at end of file