COM2EnumConverter.cs source code in C# .NET

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Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / WinForms / Managed / System / WinForms / ComponentModel / COM2Interop / COM2EnumConverter.cs / 1305376 / COM2EnumConverter.cs

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

 
/* 
 */
namespace System.Windows.Forms.ComponentModel.Com2Interop { 

    using System.Diagnostics;
    using System;
    using System.ComponentModel; 
    using System.Drawing;
    using System.Collections; 
    using Microsoft.Win32; 
    using System.Globalization;
 
    internal class Com2EnumConverter : TypeConverter {

        internal readonly Com2Enum com2Enum;
        private  StandardValuesCollection values; 

        public Com2EnumConverter(Com2Enum enumObj) { 
            com2Enum = enumObj; 
        }
 
        /// 
        /// 
        ///      Determines if this converter can convert an object in the given source
        ///      type to the native type of the converter. 
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { 
            if (sourceType == typeof(string)) { 
                return true;
            } 
            return base.CanConvertFrom(context, sourceType);
        }

        public override bool CanConvertTo(ITypeDescriptorContext context, Type destType) { 
           if (base.CanConvertTo(context, destType)) {
               return true; 
           } 
           return destType.IsEnum;
       } 


        /// 
        ///  
        ///      Converts the given object to the converter's native type.
        ///  
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { 
            if (value is string) {
                 return com2Enum.FromString((string)value); 
            }
            return base.ConvertFrom(context, culture, value);
        }
 
        /// 
        ///  
        ///      Converts the given object to another type.  The most common types to convert 
        ///      are to and from a string object.  The default implementation will make a call
        ///      to ToString on the object if the object is valid and if the destination 
        ///      type is string.  If this cannot convert to the desitnation type, this will
        ///      throw a NotSupportedException.
        /// 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if (destinationType == null) {
                throw new ArgumentNullException("destinationType"); 
            } 

            if (destinationType == typeof(string)) { 
                if (value != null) {
                    string str = com2Enum.ToString(value);
                    return (str == null ? "" : str);
                } 
            }
 
            if (destinationType.IsEnum) { 
                return Enum.ToObject(destinationType, value);
            } 
            return base.ConvertTo(context, culture, value, destinationType);
        }

        ///  
        /// 
        ///      Retrieves a collection containing a set of standard values 
        ///      for the data type this validator is designed for.  This 
        ///      will return null if the data type does not support a
        ///      standard set of values. 
        /// 
        public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) {
            if (values == null) {
                object[] objValues = com2Enum.Values; 
                if (objValues != null) {
                    values = new StandardValuesCollection(objValues); 
                } 
            }
            return values; 
        }

        /// 
        ///  
        ///      Determines if the list of standard values returned from
        ///      GetStandardValues is an exclusive list.  If the list 
        ///      is exclusive, then no other values are valid, such as 
        ///      in an enum data type.  If the list is not exclusive,
        ///      then there are other valid values besides the list of 
        ///      standard values GetStandardValues provides.
        /// 
        public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) {
            return com2Enum.IsStrictEnum; 
        }
 
        ///  
        /// 
        ///      Determines if this object supports a standard set of values 
        ///      that can be picked from a list.
        /// 
        public override bool GetStandardValuesSupported(ITypeDescriptorContext context) {
            return true; 
        }
 
        ///  
        /// 
        ///      Determines if the given object value is valid for this type. 
        /// 
        public override bool IsValid(ITypeDescriptorContext context, object value) {
            string strValue = com2Enum.ToString(value);
            return strValue != null && strValue.Length > 0; 
        }
 
        public void RefreshValues() { 
            this.values = null;
        } 
    }
}

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

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