Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/Cache/OutputCacheProviderCollection.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Configuration.Provider;
+using System.Security.Permissions;
+using System.Web;
+
+namespace System.Web.Caching {
+    public sealed class OutputCacheProviderCollection : ProviderCollection {
+
+        new public OutputCacheProvider this[string name] {
+            get {
+                return (OutputCacheProvider) base[name];
+            }
+        }
+        
+        public override void Add(ProviderBase provider) {
+            if (provider == null) {
+                throw new ArgumentNullException( "provider" );
+            }
+            
+            if (!(provider is OutputCacheProvider)) {
+                throw new ArgumentException(SR.GetString(SR.Provider_must_implement_type, typeof(OutputCacheProvider).Name),
+                                            "provider");
+            }
+            
+            base.Add(provider);
+        }
+        
+        public void CopyTo(OutputCacheProvider[] array, int index) {
+            base.CopyTo(array, index);
+        }
+    }
+}