Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / CompMod / System / ComponentModel / TypeListConverter.cs / 1 / TypeListConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.ComponentModel { using Microsoft.Win32; using System.Collections; using System.ComponentModel.Design.Serialization; using System.Diagnostics; using System.Globalization; using System.Reflection; using System.Runtime.InteropServices; using System.Runtime.Remoting; using System.Runtime.Serialization.Formatters; using System.Security.Permissions; ////// [HostProtection(SharedState = true)] public abstract class TypeListConverter : TypeConverter { private Type[] types; private StandardValuesCollection values; ///Provides a type /// converter that can be used to populate a list box with available types. ////// protected TypeListConverter(Type[] types) { this.types = types; } ///Initializes a new instance of the ///class using /// the type array as the available types. /// /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } return base.CanConvertFrom(context, sourceType); } ///Gets a value indicating whether this converter /// can convert an object in the given source type to an enumeration object using /// the specified context. ////// 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. ////// /// public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { foreach(Type t in types) { if (value.Equals(t.FullName)) { return t; } } } return base.ConvertFrom(context, culture, value); } ///Converts the specified value object to an enumeration object. ////// /// public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == null) { throw new ArgumentNullException("destinationType"); } if (destinationType == typeof(string)) { if (value == null) { return SR.GetString(SR.toStringNone); } else { return((Type)value).FullName; } } if (destinationType == typeof(InstanceDescriptor) && value is Type) { MethodInfo method = typeof(Type).GetMethod("GetType", new Type[] {typeof(string)}); if (method != null) { return new InstanceDescriptor(method, new object[] {((Type)value).AssemblyQualifiedName}); } } return base.ConvertTo(context, culture, value, destinationType); } ///Converts the given value object to the specified destination type. ////// /// public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context) { if (values == null) { object[] objTypes; if (types != null) { objTypes = new object[types.Length]; Array.Copy(types, objTypes, types.Length); } else { objTypes = null; } values = new StandardValuesCollection(objTypes); } return values; } ///Gets a collection of standard values for the data type this validator is /// designed for. ////// /// public override bool GetStandardValuesExclusive(ITypeDescriptorContext context) { return true; } ///Gets a value indicating whether the list of standard values returned from /// ///is an exclusive list. /// /// public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return true; } } }Gets a value indicating whether this object supports a /// standard set of values that can be picked from a list using the specified /// context. ///
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