IconConverter.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / IconConverter.cs / 1305376 / IconConverter.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

/* 
 */ 
namespace System.Drawing {
    using System.Runtime.Serialization.Formatters; 
    using System.Runtime.InteropServices;
    using System.IO;
    using System.Diagnostics;
    using Microsoft.Win32; 
    using System.Collections;
    using System.ComponentModel; 
    using System.Globalization; 
    using System.Reflection;
    using System.ComponentModel.Design.Serialization; 
    using System.Diagnostics.CodeAnalysis;
    using System.Runtime.Versioning;

    ///  
    /// 
    ///      IconConverter is a class that can be used to convert 
    ///      Icon from one data type to another.  Access this 
    ///      class through the TypeDescriptor.
    ///  
    public class IconConverter : ExpandableObjectConverter {

        /// 
        ///  
        ///    Gets a value indicating whether this converter can
        ///       convert an object in the given source type to the native type of the converter 
        ///       using the context. 
        /// 
        public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { 
            if (sourceType == typeof(byte[])) {
                return true;
            }
 
            if(sourceType == typeof(InstanceDescriptor)){
                return false; 
            } 

            return base.CanConvertFrom(context, sourceType); 
        }

        /// 
        ///  
        ///    Gets a value indicating whether this converter can
        ///       convert an object to the given destination type using the context. 
        ///  
        public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) {
            if (destinationType == typeof(Image) || destinationType == typeof(Bitmap)) { 
                return true;
            }

            if (destinationType == typeof(byte[])) { 
                return true;
            } 
 
            return base.CanConvertTo(context, destinationType);
        } 

        /// 
        /// 
        ///    Converts the given object to the converter's native type. 
        /// 
        [SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")] 
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { 
            if (value is byte[]) {
                MemoryStream ms = new MemoryStream((byte[])value);
                return new Icon(ms);
            } 

            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. 
        ///  
        [SuppressMessage("Microsoft.Performance", "CA1800:DoNotCastUnnecessarily")]
        [SuppressMessage("Microsoft.Reliability", "CA2000:DisposeObjectsBeforeLosingScope")] 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) {
            if (destinationType == null) { 
                throw new ArgumentNullException("destinationType");
            } 
 
            if (destinationType == typeof(Image) || destinationType == typeof(Bitmap)) {
                Icon icon = value as Icon; 
                if( icon != null ) {
                    return icon.ToBitmap();
                }
            } 
            if (destinationType == typeof(string)) {
                if (value != null) { 
                    return value.ToString(); 
                }
                else { 
                    return SR.GetString(SR.toStringNone);
                }
            }
            if (destinationType == typeof(byte[])) { 
                if (value != null) {
                    MemoryStream ms = null; 
                    try { 
                        ms = new MemoryStream();
                        Icon icon = value as Icon; 
                        if( icon != null ) {
                            icon.Save(ms);
                        }
                    } 
                    finally {
                        if (ms != null) { 
                            ms.Close(); 
                        }
                    } 
                    if (ms != null) {
                        return ms.ToArray();
                    }
                    else { 
                        return null;
                    } 
                } 
                else {
                    return new byte[0]; 
                }
            }

            return base.ConvertTo(context, culture, value, destinationType); 
        }
    } 
} 


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

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