Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System/compmod/system/componentmodel/StringConverter.cs

@@ -0,0 +1,50 @@
+//------------------------------------------------------------------------------
+// <copyright file="StringConverter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ */
+namespace System.ComponentModel {
+    
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Runtime.InteropServices;
+    using System.Runtime.Remoting;
+    using System.Runtime.Serialization.Formatters;
+    using System.Security.Permissions;
+
+    /// <devdoc>
+    ///    <para>Provides a type converter to convert string objects to and from various other
+    ///       representations.</para>
+    /// </devdoc>
+    [HostProtection(SharedState = true)]
+    public class StringConverter : TypeConverter {
+
+        /// <devdoc>
+        ///    <para>Gets a value indicating whether this converter can convert an object in the
+        ///       given source type to a string using the specified context.</para>
+        /// </devdoc>
+        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
+            if (sourceType == typeof(string)) {
+                return true;
+            }
+            return base.CanConvertFrom(context, sourceType);
+        }
+
+        /// <devdoc>
+        ///    <para>Converts the specified value object to a string object.</para>
+        /// </devdoc>
+        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
+            if (value is string) {
+                return (string)value;
+            }
+            if (value == null) {
+                return "";
+            }
+            return base.ConvertFrom(context, culture, value);
+        }
+    }
+}
+