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RichLabelTextType type = (RichLabelTextType)Enum.Parse( typeof(RichLabelTextType), values[0], true); // Get rid of the spaces and angle brackets around the tag name. string tag = values[1].Trim(new char[]{' ','<','>'}); return new RichLabelFormattingOptions(type, tag); } catch { throw new ArgumentException("Could not convert the value"); } } Before attempting a conversion from a string to a RichLabelFormattingOptions object, the Properties window will first query the CanConvertFrom() method. If it receives a true value, it will call the actual ConvertFrom() method. All the CanConvertFrom() method needs to do is check that the supplied type is a string, as follows: public override bool CanConvertFrom(ITypeDescriptorContext context, Type sourceType) { if (sourceType == typeof(string)) { return true; } else { return base.CanConvertFrom(context, sourceType); } } The ConvertFrom() method calls the conversion by calling the FromString() method shown earlier: public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value) { if (value is string) { return FromString(value); } else { return base.ConvertFrom(context, culture, value); } }

It is good object-oriented programming practice to always give the base classes from which you inherit a chance to handle a message you are not going to support. In this case, any requests to perform a conversion from an unrecognized type are passed to the base class.

The manager used to create this entry in the history model is determined according to the attribute that was set aside when was called at the beginning of the process. The manager assigned there is the last step of the process.

The same process occurs in reverse when converting a RichLabelFormattingOptions object to a string. First, the Properties window calls CanConvertTo(). If it returns true, the next step is to call the ConvertTo() method. Here s the code you need:

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public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(string)) { return true; } else { return base.CanConvertTo(context, destinationType); } } public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == typeof(string)) { return ToString(value); } else { return base.ConvertTo(context, culture, value, destinationType); } } Now that you have a fully functioning type converter, the next step is to attach it to the corresponding property.

You can attach a type converter in two ways. You can add the TypeConverter attribute to the related class (in this case, RichLabelFormattingOptions), as shown here: [TypeConverter(typeof(RichLabelFormattingOptionsConverter))] public class RichLabelFormattingOptions { ... } This way, whenever an instance of this class is used for a control, Visual Studio knows to use your type converter. Alternatively, you can attach the type converter directly to the property in your custom control that uses it, as shown here: [TypeConverter(typeof(RichLabelFormattingOptionsConverter))] public RichLabelFormattingOptions Format { ... } This approach makes the most sense if you are using a generic data type (such as a string) and you want to customize its behavior in only this case. Now you can recompile the code, and try using the RichLabel control in a sample web page. When you select a RichLabel, you ll see the current value of the RichLabel.Format property in the Properties window (shown in Figure 28-5), and you can edit it by hand.

In order to access the historical records for a given model, a manager is attached to the original model using the name where the object was assigned. The object that gets assigned is actually a descriptor, which creates a customized manager when accessed. All the manager code is located in a new module, , which is referenced from as follows:

When changing details such as type converter, control designer, and control builders, your changes will not appear immediately in the design environment after a recompile. Instead, you may need to close the solution with the test web pages and then reopen it.

Figure 28-5. A string representation of the RichLabelFormattingOptions object Of course, unless you enter the correct string representation, you ll receive an error message, and your change will be rejected. In other words, the custom type converter shown here gives you the ability to specify a RichLabelFormattingOptions object as a string, but the process certainly isn t user-friendly. The next section shows you how to improve this level of support.

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