User-defined Controls and Their Properties

I am working on a user-defined button, this has two custom properties like this:

public enum FirstType
{
    egg,
    leg
}
// first property:
public FirstType FirstProperty { get; set; }

and I have a base class and 5 derived classes of this base class, and the second property will refer to one of the开发者_Go百科se 5,

//second property
public BaseClass SecondProperty { get; set; }

Now my question is: how can I have a drop down list of these 5 classes for the second property in properties window like the first one? Is it possible?

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For that property you need to create your own custom TypeConverter and override GetStandardValues

This is your property:

[TypeConverter(typeof(MyTypeConverter)]
public BaseClass SecondProperty { get; set; }

This is your type converter:

public class MyTypeConverter : TypeConverter
{
    ...

    public override bool GetStandardValuesSupported(ITypeDescriptorContext context)
    {
        return true;
    }

    /// <summary>
    /// select only from list
    /// </summary>
    public override bool GetStandardValuesExclusive(ITypeDescriptorContext context)
    {
        return true;
    }

    public override StandardValuesCollection GetStandardValues(ITypeDescriptorContext context)
    {
        return new StandardValuesCollection(/* list of derived classes */);
    }
}

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OK,I used enum to solve my problem, first a property of this enum type, then called those classes in set statement of the property. Thanks to all.