IconConverter.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / CommonUI / System / Drawing / IconConverter.cs / 1 / 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;

    /// 
    ///  
    ///      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")]
        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")] 
        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.
//------------------------------------------------------------------------------ 
// 
//     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;

    /// 
    ///  
    ///      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")]
        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")] 
        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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