78 lines
2.6 KiB
C#
78 lines
2.6 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="GenericEnumConverter.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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using System;
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using System.Collections;
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using System.IO;
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using System.Reflection;
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using System.Security.Permissions;
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using System.Xml;
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using System.Collections.Specialized;
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using System.Globalization;
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using System.ComponentModel;
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using System.Security;
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using System.Text;
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namespace System.Configuration {
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public sealed class GenericEnumConverter : ConfigurationConverterBase {
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private Type _enumType;
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public GenericEnumConverter(Type typeEnum) {
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if (typeEnum == null) {
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throw new ArgumentNullException("typeEnum");
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}
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_enumType = typeEnum;
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}
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public override object ConvertTo(ITypeDescriptorContext ctx, CultureInfo ci, object value, Type type) {
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Debug.Assert(typeof(System.Enum).IsAssignableFrom(value.GetType()), "typeof(System.Enum).IsAssignableFrom(value.GetType())");
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return value.ToString();
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}
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public override object ConvertFrom(ITypeDescriptorContext ctx, CultureInfo ci, object data) {
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object result = null;
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//
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// For any error, throw the ArgumentException with SR.Invalid_enum_value
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//
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try {
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string value = (string)data;
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if (String.IsNullOrEmpty(value)) {
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throw new Exception();
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}
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// Disallow numeric values for enums.
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if (!String.IsNullOrEmpty(value) &&
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(Char.IsDigit(value[0]) ||
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(value[0] == '-') ||
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(value[0] == '+'))) {
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throw new Exception();
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}
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if (value != value.Trim()) { // throw if the value has whitespace
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throw new Exception();
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}
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result = Enum.Parse(_enumType, value);
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}
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catch {
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StringBuilder names = new StringBuilder();
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foreach (string name in Enum.GetNames(_enumType)) {
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if (names.Length != 0) {
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names.Append(", ");
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}
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names.Append(name);
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}
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throw new ArgumentException(SR.GetString(SR.Invalid_enum_value, names.ToString()));
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}
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return result;
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}
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}
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}
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