Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / 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 { ////// /// 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 in the given source type to the native type of the converter /// 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); } ///Gets a value indicating whether this converter can /// convert an object to the given destination type using the context. ////// /// [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 the converter's native type. ////// /// 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.
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