GenericEnumConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Configuration / System / Configuration / GenericEnumConverter.cs / 1305376 / GenericEnumConverter.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

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 GenericEnumConverter : ConfigurationConverterBase {
        private Type _enumType;
 
        public GenericEnumConverter(Type typeEnum) {
            if (typeEnum == null) { 
                throw new ArgumentNullException("typeEnum"); 
            }
 
            _enumType = typeEnum;
        }

        public override object ConvertTo(ITypeDescriptorContext ctx, CultureInfo ci, object value, Type type) { 
            Debug.Assert(typeof(System.Enum).IsAssignableFrom(value.GetType()), "typeof(System.Enum).IsAssignableFrom(value.GetType())");
 
            return value.ToString(); 
        }
 
        public override object ConvertFrom(ITypeDescriptorContext ctx, CultureInfo ci, object data) {
            object result = null;
            //
            // For any error, throw the ArgumentException with SR.Invalid_enum_value 
            //
            try { 
                string value = (string)data; 
                if (String.IsNullOrEmpty(value)) {
                    throw new Exception(); 
                }

                // Disallow numeric values for enums.
                if (!String.IsNullOrEmpty(value) && 
                        (Char.IsDigit(value[0]) ||
                        (value[0] == '-') || 
                        (value[0] == '+'))) { 
                    throw new Exception();
                } 

                if (value != value.Trim()) { // throw if the value has whitespace
                    throw new Exception();
                } 

                result = Enum.Parse(_enumType, value); 
            } 
            catch {
                StringBuilder names = new StringBuilder(); 

                foreach (string name in Enum.GetNames(_enumType)) {
                    if (names.Length != 0) {
                        names.Append(", "); 
                    }
                    names.Append(name); 
                } 
                throw new ArgumentException(SR.GetString(SR.Invalid_enum_value, names.ToString()));
            } 
            return result;
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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