PropertyConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / PropertyConverter.cs / 1305376 / PropertyConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Web.UI { 
    using System; 
    using System.ComponentModel;
    using System.Globalization; 
    using System.Reflection;
    using System.Runtime.Serialization.Formatters;

    ///  
    /// 
    ///  
    public static class PropertyConverter { 

        private static readonly Type[] s_parseMethodTypes = new Type[] { typeof(string) }; 
        private static readonly Type[] s_parseMethodTypesWithSOP = new Type[] { typeof(string), typeof(IServiceProvider) };

        /*
         * Contains helpers to convert properties from strings to their types and vice versa. 
         */
 
        /* 
         * Converts a persisted enumeration value into its numeric value.
         * Hyphen characters in the persisted format are converted to underscores. 
         */

        /// 
        ///  
        public static object EnumFromString(Type enumType, string value) {
            try { 
                return Enum.Parse(enumType, value, true); 
            }
            catch { 
                return null;
            }
        }
 
        /*
         * Converts a numeric enumerated value into its persisted form, which is the 
         * code name with underscores replaced by hyphens. 
         */
 
        /// 
        /// 
        public static string EnumToString(Type enumType, object enumValue) {
            string value = Enum.Format(enumType, enumValue, "G"); 

            // 
 
            return value.Replace('_','-');
        } 

        /*
         * Converts the persisted string into an object using the object's
         * FromString method. 
         */
 
        ///  
        /// 
        public static object ObjectFromString(Type objType, MemberInfo propertyInfo, string value) { 
            if (value == null)
                return null;

            // Blank valued bools don't map with FromString. Return null to allow 
            // caller to interpret.
            if (objType.Equals(typeof(bool)) && value.Length == 0) { 
                return null; 
            }
 
            bool useParseMethod = true;
            object ret = null;

            try { 
                if (objType.IsEnum) {
                    useParseMethod = false; 
                    ret = EnumFromString(objType, value); 
                }
                else if (objType.Equals(typeof(string))) { 
                    useParseMethod = false;
                    ret = value;
                }
                else { 
                    PropertyDescriptor pd = null;
                    if (propertyInfo != null) { 
                        pd = TypeDescriptor.GetProperties(propertyInfo.ReflectedType)[propertyInfo.Name]; 
                    }
                    if (pd != null) { 
                        TypeConverter converter = pd.Converter;
                        if (converter != null && converter.CanConvertFrom(typeof(string))) {
                            useParseMethod = false;
                            ret = converter.ConvertFromInvariantString(value); 
                        }
                    } 
                } 
            }
            catch { 
            }

            if (useParseMethod) {
                // resort to Parse static method on the type 

                // First try Parse(string, IServiceProvider); 
                MethodInfo methodInfo = objType.GetMethod("Parse", s_parseMethodTypesWithSOP); 

                if (methodInfo != null) { 
                    object[] parameters = new object[2];

                    parameters[0] = value;
                    parameters[1] = CultureInfo.InvariantCulture; 
                    try {
                        ret = Util.InvokeMethod(methodInfo, null, parameters); 
                    } 
                    catch {
                    } 
                }
                else {
                    // Try the simpler: Parse(string);
                    methodInfo = objType.GetMethod("Parse", s_parseMethodTypes); 

                    if (methodInfo != null) { 
                        object[] parameters = new object[1]; 

                        parameters[0] = value; 
                        try {
                            ret = Util.InvokeMethod(methodInfo, null, parameters);
                        }
                        catch { 
                        }
                    } 
                } 
            }
 
            if (ret == null) {
                // Unhandled... throw an exception, so user sees an error at parse time
                // Note that we don't propagate inner exceptions here, since they usually
                // do not give any information about where the bad value existed on 
                // the object being initialized, whereas, our exception gives that
                // information. 
                throw new HttpException(SR.GetString(SR.Type_not_creatable_from_string, 
                                                                         objType.FullName, value, propertyInfo.Name));
            } 

            return ret;
        }
    } 
}
 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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PropertyConverter.cs source code in C# .NET

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