unitconverter.cs source code in C# .NET

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

namespace System.Web.UI.WebControls { 
 
    using System;
    using System.ComponentModel; 
    using System.ComponentModel.Design.Serialization;
    using System.Globalization;
    using System.Reflection;
    using System.Web.Util; 

 
    public class UnitConverter : TypeConverter { 

 
        /// 
        /// 
        ///   Returns a value indicating whether the unit converter can
        ///   convert from the specified source type. 
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { 
            if (sourceType == typeof(string)) { 
                return true;
            } 
            else {
                return base.CanConvertFrom(context, sourceType);
            }
        } 

 
        ///  
        /// 
        ///   Returns a value indicating whether the converter can 
        ///   convert to the specified destination type.
        /// 
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
            if ((destinationType == typeof(string)) || 
                (destinationType == typeof(InstanceDescriptor))) {
                return true; 
            } 
            else {
                return base.CanConvertTo(context, destinationType); 
            }
        }

 
        /// 
        ///  
        ///   Performs type conversion from the given value into a Unit. 
        /// 
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { 
            if (value == null)
                return null;

            string stringValue = value as string; 
            if (stringValue != null) {
                string textValue = stringValue.Trim(); 
                if (textValue.Length == 0) { 
                    return Unit.Empty;
                } 
                if (culture != null)  {
                    return Unit.Parse(textValue, culture);
                }
                else { 
                    return Unit.Parse(textValue, CultureInfo.CurrentCulture);
                } 
            } 
            else {
                return base.ConvertFrom(context, culture, value); 
            }
        }

 
        /// 
        ///  
        ///   Performs type conversion to the specified destination type 
        /// 
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { 
            if (destinationType == typeof(string)) {
                if ((value == null) || ((Unit)value).IsEmpty)
                    return String.Empty;
                else 
                    return ((Unit)value).ToString(culture);
            } 
            else if ((destinationType == typeof(InstanceDescriptor)) && (value != null)) { 
                Unit u = (Unit)value;
                MemberInfo member = null; 
                object[] args = null;

                if (u.IsEmpty) {
                    member = typeof(Unit).GetField("Empty"); 
                }
                else { 
                    member = typeof(Unit).GetConstructor(new Type[] { typeof(double), typeof(UnitType) }); 
                    args = new object[] { u.Value, u.Type };
                } 

                Debug.Assert(member != null, "Looks like we're missing Unit.Empty or Unit::ctor(double, UnitType)");
                if (member != null) {
                    return new InstanceDescriptor(member, args); 
                }
                else { 
                    return null; 
                }
            } 
            else {
                return base.ConvertTo(context, culture, value, destinationType);
            }
        } 
    }
} 
 

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

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