ColorConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Core / CSharp / System / Windows / Media / ColorConverter.cs / 1305600 / ColorConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
//  Microsoft Avalon
//  Copyright (c) Microsoft Corporation, 2001, 2002
//
//  File: ColorConverter.cs 
//-----------------------------------------------------------------------------
using System; 
using System.IO; 
using System.ComponentModel;
using System.ComponentModel.Design.Serialization; 
using System.Reflection;
using MS.Internal;
using System.Windows.Media;
using System.Text; 
using System.Collections;
using System.Globalization; 
using System.Runtime.InteropServices; 
using System.Security;
 
using SR=MS.Internal.PresentationCore.SR;
using SRID=MS.Internal.PresentationCore.SRID;

namespace System.Windows.Media 
{
    ///  
    /// ColorConverter Parses a color. 
    /// 
    public sealed class ColorConverter : TypeConverter 
    {
        /// 
        /// CanConvertFrom
        ///  
        public override bool CanConvertFrom(ITypeDescriptorContext td, Type t)
        { 
            if (t == typeof(string)) 
            {
                return true; 
            }
            else
            {
                return false; 
            }
        } 
 
        /// 
        /// TypeConverter method override. 
        /// 
        /// ITypeDescriptorContext
        /// Type to convert to
        /// true if conversion is possible 
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
        { 
            if (destinationType == typeof(InstanceDescriptor)) 
            {
                return true; 
            }

            return base.CanConvertTo(context, destinationType);
        } 

        /// 
        /// ConvertFromString 
        ///
        public static new object ConvertFromString(string value) 
        {
            if ( null == value)
            {
                return null; 
            }
 
            return Parsers.ParseColor(value, null); 
        }
 
        /// 
        /// ConvertFrom - attempt to convert to a Color from the given object
        /// 
        ///  
        /// A NotSupportedException is thrown if the example object is null or is not a valid type
        /// which can be converted to a Color. 
        ///  
        public override object ConvertFrom(ITypeDescriptorContext td, System.Globalization.CultureInfo ci, object value)
        { 
            if (null == value)
            {
                throw GetConvertFromException(value);
            } 

            String s = value as string; 
 
            if (null == s)
            { 
                throw new ArgumentException(SR.Get(SRID.General_BadType, "ConvertFrom"), "value");
            }

            return Parsers.ParseColor(value as string, ci, td); 
        }
 
        ///  
        /// TypeConverter method implementation.
        ///  
        /// 
        /// An NotSupportedException is thrown if the example object is null or is not a Color,
        /// or if the destinationType isn't one of the valid destination types.
        ///  
        /// ITypeDescriptorContext
        /// current culture (see CLR specs) 
        /// value to convert from 
        /// Type to convert to
        /// converted value 
        ///
        ///     Critical: calls InstanceDescriptor ctor which LinkDemands
        ///     PublicOK: can only make an InstanceDescriptor for Color.FromArgb, not an arbitrary class/method
        /// 
        [SecurityCritical]
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) 
        { 
            if (destinationType != null && value is Color)
            { 
                if (destinationType == typeof(InstanceDescriptor))
                {
                    MethodInfo mi = typeof(Color).GetMethod("FromArgb", new Type[]{typeof(byte), typeof(byte), typeof(byte), typeof(byte)});
                    Color c = (Color)value; 
                    return new InstanceDescriptor(mi, new object[]{c.A, c.R, c.G, c.B});
                } 
                else if (destinationType == typeof(string)) 
                {
                    Color c = (Color)value; 
                    return c.ToString(culture);
                }
            }
 
            // Pass unhandled cases to base class (which will throw exceptions for null value or destinationType.)
            return base.ConvertTo(context, culture, value, destinationType); 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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ColorConverter.cs source code in C# .NET

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