Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / ComponentModel / COM2Interop / COM2IDispatchConverter.cs / 1 / COM2IDispatchConverter.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Windows.Forms.ComponentModel.Com2Interop { using System.Diagnostics; using System; using System.ComponentModel; using System.Collections; using Microsoft.Win32; using System.Globalization; internal class Com2IDispatchConverter : Com2ExtendedTypeConverter{ Com2PropertyDescriptor propDesc; ////// /// What we return textually for null. /// protected static readonly string none = SR.GetString(SR.toStringNone); private bool allowExpand; public Com2IDispatchConverter(Com2PropertyDescriptor propDesc, bool allowExpand, TypeConverter baseConverter) : base(baseConverter){ this.propDesc = propDesc; this.allowExpand = allowExpand; } public Com2IDispatchConverter(Com2PropertyDescriptor propDesc, bool allowExpand) : base(propDesc.PropertyType){ this.propDesc = propDesc; this.allowExpand = allowExpand; } ////// /// Determines if this converter can convert an object in the given source /// type to the native type of the converter. /// public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { return false; } ////// /// Determines if this converter can convert an object to the given destination /// type. /// public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { return destinationType == typeof(string); } ////// /// 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 == typeof(string)){ if (value == null){ return none; } string text = ComNativeDescriptor.Instance.GetName(value); if (text == null || text.Length == 0){ text = ComNativeDescriptor.Instance.GetClassName(value); } if (text == null){ return "(Object)"; } return text; } return base.ConvertTo(context, culture, value, destinationType); } public override PropertyDescriptorCollection GetProperties(ITypeDescriptorContext context, object value, Attribute[] attributes) { return TypeDescriptor.GetProperties(value, attributes); } ////// /// Determines if this object supports properties. By default, this /// is false. /// public override bool GetPropertiesSupported(ITypeDescriptorContext context) { return this.allowExpand; } // no dropdown, please! // public override bool GetStandardValuesSupported(ITypeDescriptorContext context) { return false; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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