/// <summary>
/// Obtains the <see cref="TypeConverter.StandardValuesCollection"/> from <see cref="EnumConverter.GetStandardValues"/>,
/// and adds the current value to the beginning of the <see cref="TypeConverter.StandardValuesCollection"/>, if necessary.
/// </summary>
/// <remarks>
/// The current value will be added to the beginning of the <see cref="TypeConverter.StandardValuesCollection"/> returned
/// by <see cref="EnumConverter.GetStandardValues"/> if the following conditions are met:
/// <list type="bullet">
/// <item><description><paramref name="context"/> is not <see langword="null"/></description></item>
/// <item><description><see cref="ITypeDescriptorContext.Instance"/> is not <see langword="null"/>.</description></item>
/// <item><description><see cref="ITypeDescriptorContext.PropertyDescriptor"/> is not <see langword="null"/>.</description></item>
/// <item><description><see cref="PropertyDescriptor.GetValue"/> returns a value of type <typeparamref name="TEnum"/>.</description></item>
/// <item><description><see cref="Enum.IsDefined"/> returns <see langword="true"/> for that value.</description></item>
/// <item><description>The <see cref="TypeConverter.StandardValuesCollection"/> returned by <see cref="EnumConverter.GetStandardValues"/> does not already contain that value.</description></item>
/// </list>
/// </remarks>
/// <seealso cref="TypeConverter.GetStandardValues(ITypeDescriptorContext)"/>
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
StandardValuesCollection standardValuesCollection = base.GetStandardValues(context);
object component;
PropertyDescriptor propertyDescriptor;
if (context != null && (component = context.Instance) != null && (propertyDescriptor = context.PropertyDescriptor) != null)
{
TEnum? valueNullable = propertyDescriptor.GetValue(component) as TEnum?;
TEnum value;
EnumValueInfo?valueInfoNullable;
if (valueNullable.HasValue && (valueInfoNullable = GetValueInfo(value = valueNullable.Value)).HasValue)
{
// Since we found an EnumValueInfo for the value, we know that Enum.IsDefined would return true
if (!valueInfoNullable.Value.Browsable)
{
// Since the value is not browsable, it will not be in the StandardValuesCollection we retrieved from EnumConverter,
// so we have to add it.
TEnum[] newStandardValues = new TEnum[standardValuesCollection.Count + 1];
newStandardValues[0] = value;
standardValuesCollection.CopyTo(newStandardValues, 1);
return(new StandardValuesCollection(newStandardValues));
}
}
}
return(standardValuesCollection);
}
public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
{
StandardValuesCollection stdv = base.GetStandardValues(context);
AutoCompleteSource[] arr = new AutoCompleteSource[stdv.Count];
stdv.CopyTo(arr, 0);
AutoCompleteSource[] arr2 = Array.FindAll(arr, delegate(AutoCompleteSource value) {
// No "ListItems" in a TextBox.
return(value != AutoCompleteSource.ListItems);
});
return(new StandardValuesCollection(arr2));
}