Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Web/UI/WebControls/StringArrayConverter.cs

@@ -0,0 +1,74 @@
+//------------------------------------------------------------------------------
+// <copyright file="StringArrayConverter.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls {
+
+    using System.ComponentModel.Design;
+    using System;
+    using System.ComponentModel;
+    using System.Collections;    
+    using System.Globalization;
+
+    // 
+
+
+    /// <devdoc>
+    ///    <para>Converts a string separated by commas to and from 
+    ///       an array of strings.</para>
+    /// </devdoc>
+    public class StringArrayConverter : TypeConverter {
+
+        /// <devdoc>
+        ///    <para>Determines if the specified data type can be converted to an array of strings. </para>
+        /// </devdoc>
+        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) {
+            if (sourceType == typeof(string)) {
+                return true;
+            }
+            return false;
+        }
+
+
+        /// <devdoc>
+        ///    <para>Parses a string  separated by 
+        ///       commas into an array of strings. </para>
+        /// </devdoc>
+        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) {
+            if (value is string) {
+                if (((string)value).Length == 0) {
+                    return new string[0];
+                }
+                
+                // hard code comma, since it is persisted to HTML
+                // 
+                string[] names = ((string)value).Split(new char[] {','});
+                for (int i=0; i<names.Length; i++) {
+                    names[i] = names[i].Trim();
+                }
+                return names;
+            }
+            throw GetConvertFromException(value);
+        }
+
+
+        /// <devdoc>
+        ///    <para> Creates a string separated 
+        ///       by commas from an array of strings.</para>
+        /// </devdoc>
+        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
+            if (destinationType == typeof(string)) {
+                
+                if (value == null) {
+                    return String.Empty;
+                }
+                // hard code comma, since it is persisted to HTML
+                // 
+                return string.Join(",", ((string[])value));
+            }
+            throw GetConvertToException(value, destinationType);
+        }
+    }
+}