|
//---------------------------------------------------------------------------
//
// File: ExpressionConverter.cs
//
// Description:
// TypeConverter for a generic property value expression
//
// Copyright (C) 2003 by Microsoft Corporation. All rights reserved.
//
//---------------------------------------------------------------------------
using System;
using System.ComponentModel;
using System.Globalization;
using System.ComponentModel.Design.Serialization;
namespace System.Windows
{
/// <summary>
/// TypeConverter for a generic property value expression
/// </summary>
/// <remarks>
/// The cole purpose of this TypeConveret is to block the
/// default TypeConverter/ ToString() behavior
/// </remarks>
public class ExpressionConverter : TypeConverter
{
/// <summary>
/// TypeConverter method override.
/// </summary>
/// <param name="context">
/// ITypeDescriptorContext
/// </param>
/// <param name="sourceType">
/// Type to convert from
/// </param>
/// <returns>
/// true if conversion is possible
/// </returns>
public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType)
{
return false;
}
/// <summary>
/// TypeConverter method override.
/// </summary>
/// <param name="context">
/// ITypeDescriptorContext
/// </param>
/// <param name="destinationType">
/// Type to convert to
/// </param>
/// <returns>
/// true if conversion is possible
/// </returns>
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
return false;
}
/// <summary>
/// TypeConverter method implementation.
/// </summary>
/// <param name="context">
/// ITypeDescriptorContext
/// </param>
/// <param name="culture">
/// current culture (see CLR specs)
/// </param>
/// <param name="value">
/// value to convert from
/// </param>
/// <returns>
/// value that is result of conversion
/// </returns>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
throw GetConvertFromException(value);
}
/// <summary>
/// TypeConverter method implementation.
/// </summary>
/// <param name="context">
/// ITypeDescriptorContext
/// </param>
/// <param name="culture">
/// current culture (see CLR specs)
/// </param>
/// <param name="value">
/// value to convert from
/// </param>
/// <param name="destinationType">
/// Type to convert to
/// </param>
/// <returns>
/// converted value
/// </returns>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
throw GetConvertToException(value, destinationType);
}
}
}
|