Imported Upstream version 4.2.0.179

Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479

external/referencesource/System.Configuration/System/Configuration/InfiniteTimeSpanConverter.cs

@@ -0,0 +1,46 @@
+//------------------------------------------------------------------------------
+// <copyright file="InfiniteTimeSpanConverter.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 InfiniteTimeSpanConverter : ConfigurationConverterBase {
+        static readonly TypeConverter s_TimeSpanConverter = TypeDescriptor.GetConverter(typeof(TimeSpan));
+
+        public override object ConvertTo(ITypeDescriptorContext ctx, CultureInfo ci, object value, Type type) {
+            ValidateType(value, typeof(TimeSpan));
+
+            if ((TimeSpan)value == TimeSpan.MaxValue) {
+                return "Infinite";
+            }
+            else {
+                return s_TimeSpanConverter.ConvertToInvariantString(value);
+            }
+        }
+        
+        public override object ConvertFrom(ITypeDescriptorContext ctx, CultureInfo ci, object data) {
+            Debug.Assert(data is string, "data is string");
+
+            if ((string)data == "Infinite") {
+                return TimeSpan.MaxValue;
+            }
+            else {
+                return s_TimeSpanConverter.ConvertFromInvariantString((string)data);
+            }
+        }
+    }
+}