Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Configuration/System/Configuration/InfiniteIntConverter.cs

@@ -0,0 +1,45 @@
+//------------------------------------------------------------------------------
+// <copyright file="InfiniteIntConverter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+using System;
+using System.Collections;
+using System.IO;
+using System.Reflection;
+using System.Security.Permissions;
+using System.Xml;
+using System.Collections.Specialized;
+using System.Globalization;
+using System.ComponentModel;
+using System.Security;
+using System.Text;
+
+namespace System.Configuration {
+
+    public sealed class InfiniteIntConverter : ConfigurationConverterBase {
+
+        public override object ConvertTo(ITypeDescriptorContext ctx, CultureInfo ci, object value, Type type) {
+            ValidateType(value, typeof(int));
+
+            if ((int)value == int.MaxValue) {
+                return "Infinite";
+            }
+            else {
+                return ((int)value).ToString(CultureInfo.InvariantCulture);
+            }
+        }
+        
+        public override object ConvertFrom(ITypeDescriptorContext ctx, CultureInfo ci, object data) {
+            Debug.Assert(data is string, "data is string");
+
+            if ((string)data == "Infinite") {
+                return int.MaxValue;
+            }
+            else {
+                return Convert.ToInt32((string)data, 10);
+            }
+        }
+    }
+}