Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ColumnHeaderConverter.cs / 1 / ColumnHeaderConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Windows.Forms { using System.Runtime.Serialization.Formatters; using System.Runtime.Remoting; using System.Runtime.InteropServices; using Microsoft.Win32; using System.Collections; using System.ComponentModel; using System.ComponentModel.Design.Serialization; using System.Drawing; using System.Diagnostics; using System.Globalization; using System.Reflection; ////// /// public class ColumnHeaderConverter : ExpandableObjectConverter { ////// /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor)) { 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. ////// /// 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. /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(InstanceDescriptor) && value is ColumnHeader) { ColumnHeader col = (ColumnHeader) value; ConstructorInfo ctor; Type t = TypeDescriptor.GetReflectionType(value); InstanceDescriptor id = null; if (col.ImageIndex != -1) { ctor = t.GetConstructor(new Type[]{typeof(int)}); if (ctor != null) { id = new InstanceDescriptor(ctor, new object[]{col.ImageIndex}, false); } } if (id == null && !String.IsNullOrEmpty(col.ImageKey)) { ctor = t.GetConstructor(new Type[]{typeof(string)}); if (ctor != null) { id = new InstanceDescriptor(ctor, new object[]{col.ImageKey}, false); } } if (id == null) { ctor = t.GetConstructor(new Type[0]); if (ctor != null) { return new InstanceDescriptor(ctor, new object[0], false); } else { throw new ArgumentException(SR.GetString(SR.NoDefaultConstructor, t.FullName)); } } return id; } 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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