/// <summary>Converts the given value object to the reference type using the specified context and arguments.</summary>
/// <returns>The converted object.</returns>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context. </param>
/// <param name="culture">A <see cref="T:System.Globalization.CultureInfo" /> that specifies the culture used to represent the font. </param>
/// <param name="value">The <see cref="T:System.Object" /> to convert. </param>
/// <param name="destinationType">The type to convert the object to. </param>
/// <exception cref="T:System.ArgumentNullException">
/// <paramref name="destinationType" /> is null. </exception>
/// <exception cref="T:System.NotSupportedException">The conversion cannot be performed. </exception>
public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)
{
if (destinationType != typeof(string))
{
return(base.ConvertTo(context, culture, value, destinationType));
}
if (value == null)
{
return("(none)");
}
string text = string.Empty;
if (context != null)
{
System.ComponentModel.Design.IReferenceService referenceService = context.GetService(typeof(System.ComponentModel.Design.IReferenceService)) as System.ComponentModel.Design.IReferenceService;
if (referenceService != null)
{
text = referenceService.GetName(value);
}
if ((text == null || text.Length == 0) && value is IComponent)
{
IComponent component = (IComponent)value;
if (component.Site != null && component.Site.Name != null)
{
text = component.Site.Name;
}
}
}
return(text);
}
/// <summary>Gets a collection of standard values for the reference data type.</summary>
/// <returns>A <see cref="T:System.ComponentModel.TypeConverter.StandardValuesCollection" /> that holds a standard set of valid values, or null if the data type does not support a standard set of values.</returns>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context. </param>
public override TypeConverter.StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
ArrayList arrayList = new ArrayList();
if (context != null)
{
System.ComponentModel.Design.IReferenceService referenceService = context.GetService(typeof(System.ComponentModel.Design.IReferenceService)) as System.ComponentModel.Design.IReferenceService;
if (referenceService != null)
{
foreach (object value in referenceService.GetReferences(this.reference_type))
{
if (this.IsValueAllowed(context, value))
{
arrayList.Add(value);
}
}
}
else if (context.Container != null && context.Container.Components != null)
{
foreach (object obj in context.Container.Components)
{
if (obj != null && this.IsValueAllowed(context, obj) && this.reference_type.IsInstanceOfType(obj))
{
arrayList.Add(obj);
}
}
}
arrayList.Add(null);
}
return(new TypeConverter.StandardValuesCollection(arrayList));
}
/// <summary>Converts the given object to the reference type.</summary>
/// <returns>An <see cref="T:System.Object" /> that represents the converted <paramref name="value" />.</returns>
/// <param name="context">An <see cref="T:System.ComponentModel.ITypeDescriptorContext" /> that provides a format context. </param>
/// <param name="culture">A <see cref="T:System.Globalization.CultureInfo" /> that specifies the culture used to represent the font. </param>
/// <param name="value">The <see cref="T:System.Object" /> to convert. </param>
/// <exception cref="T:System.NotSupportedException">The conversion cannot be performed. </exception>
public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
{
if (!(value is string))
{
return(base.ConvertFrom(context, culture, value));
}
if (context != null)
{
object obj = null;
System.ComponentModel.Design.IReferenceService referenceService = context.GetService(typeof(System.ComponentModel.Design.IReferenceService)) as System.ComponentModel.Design.IReferenceService;
if (referenceService != null)
{
obj = referenceService.GetReference((string)value);
}
if (obj == null && context.Container != null && context.Container.Components != null)
{
obj = context.Container.Components[(string)value];
}
return(obj);
}
return(null);
}
