Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

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

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+//------------------------------------------------------------------------------
+// <copyright file="CharConverter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ */
+namespace System.ComponentModel {
+    using Microsoft.Win32;
+    using System.ComponentModel;
+    using System.Diagnostics;
+    using System.Globalization;
+    using System.Runtime.Serialization.Formatters;
+    using System.Runtime.Remoting;
+    using System.Runtime.InteropServices;
+    using System.Security.Permissions;
+
+    /// <devdoc>
+    ///    <para>Provides
+    ///       a type converter to convert Unicode
+    ///       character objects to and from various other representations.</para>
+    /// </devdoc>
+    [HostProtection(SharedState = true)]
+    public class CharConverter : TypeConverter {
+
+        /// <devdoc>
+        ///    <para>Gets a value indicating whether this converter can
+        ///       convert an object in the given source type to a Unicode character object 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>
+		///      Converts the given object to another type.
+		/// </devdoc>
+		public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) 
+		{
+			if (destinationType == typeof(string) && value is char)
+			{
+				if ((char)value == (char)0)
+				{
+					return "";
+				}
+			}
+            
+			return base.ConvertTo(context, culture, value, destinationType);
+		}
+
+        /// <devdoc>
+        ///    <para>Converts the given object to a Unicode character object.</para>
+        /// </devdoc>
+        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
+            if (value is string) {
+                string text = (string)value;
+                if (text.Length > 1) {
+                    text = text.Trim();
+                }
+
+                if (text != null && text.Length > 0) {
+                    if (text.Length != 1) {
+                        throw new FormatException(SR.GetString(SR.ConvertInvalidPrimitive, text, "Char"));
+                    }
+                    return text[0];
+                }
+
+                return '\0';
+            }
+            return base.ConvertFrom(context, culture, value);
+        }
+    }
+}
+