unitconverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / unitconverter.cs / 1 / 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.Security.Permissions; 
    using System.Web.Util;
 
 
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    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);
            } 
        } 
    }
}

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