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As you ve seen, when control properties are serialized, they re ordered alphabetically. This can cause a problem if one property depends on another, and you ve entered validation logic to reject values that don t make sense (as you should). For example, you might create a control that exposes both a LowerBound and an UpperBound property. In this case, you ll want to ensure that the lower bound value is never greater than upper bound, and vice versa: private int upperBound; public int UpperBound { get { return upperBound; } set { if (value < lowerBound) upperBound = value; else throw new ArgumentException( "UpperBound must be greater than LowerBound."); } }

Tip Interestingly, you can use the PropertyGrid control with any object, regardless of whether it is a control, component, or simple class. The PropertyGrid allows you to modify any public property exposed by the class.

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If you re working with a user control, you don t even need to create a test form, because Visual Studio has a convenient shortcut in store. Just launch your class library directly. Visual Studio automatically shows a sample form that hosts your user control and provides a PropertyGrid to tweak it. If your project has more than one user control, just choose the one you want to test from the drop-down list (as demonstrated in Figure 13-6) and click Load. Sadly, this won t work with any other type of control. The PropertyGrid is useful for a variety of tasks, but it doesn t represent all of Visual Studio s design-time functionality. For example, you might want to debug how your control acts when it s resized on the form designer, or step through the code that implements a custom smart tag. Microsoft offers an impressive component that can help you the DesignModeDialog. The DesignModeDialog can create a design-mode representation of any form, complete with support for dragging, resizing, snap lines, and more.

private int lowerBound; public int LowerBound { get { return lowerBound; } set { if (upperBound < value) lowerBound = value; else throw new ArgumentException( "UpperBound must be greater than LowerBound."); } } The problem occurs if you set both the UpperBound and LowerBound values at design time. Here s the designer code that will be generated: control.LowerBound = 100; control.UpperBound = 500; This leads to an error because at the point when the lower bound is set, the upper bound is still 0. There s no way to alter the order in which this serialized code is generated. However, you can give your control the ability to deal with out-of-order property setting by implementing ISupportInitialize. When you do, you ll be required to supply two methods BeginInit(), which is called before any properties are set, and EndInit(), which is called after all properties are set. The serialized code becomes the following: ((ISupportInitialize)control).BeginInit(); control.LowerBound = 100; control.UpperBound = 500; ((ISupportInitialize)control).EndInit(); On its own, this doesn t solve anything. However, you code around the problem by setting a member variable in the BeginInit() method that instructs the property procedures to skip their validation logic: private bool intializing; void ISupportInitialize.BeginInit() { initializing = true; } Here s how you d rewrite the property procedures so that it performs the check only if you re not currently in initialization mode:

written in C#. You can download it form Www.windowsforms.net, and you can find it included with the code for this chapter.

public int UpperBound { get { return upperBound; } set { if (initializing || (value < lowerBound)) upperBound = value; else throw new ArgumentException( "UpperBound must be greater than LowerBound."); } } Now, in the EndInit() method you need to turn off initialization mode and check that the data is valid: void ISupportInitialize.EndInit() { initializing = false; if upperBound < lowerBound throw new ArgumentException( "UpperBound must be greater than LowerBound."); }

Figure 13-6. Automatic support for testing user controls To use the DesignModeDialog component, simply instantiate a test form, as you would normally. You also need to add each of the properties you want to design to the DesignModeDialog.PropertiesToDesign collection. You can do this using the Properties window, but here s a code-only example: Dim dialog As New DesignModeDialog() ' Set the form you want to run in design mode. dialog.HostForm = Me ' Specify the properties that should appear in the PropertyGrid. dialog.PropertiesToDesign.Add("Items") dialog.PropertiesToDesign.Add("AutoSize") dialog.PropertiesToDesign.Add("Size") dialog.PropertiesToDesign.Add("Text") dialog.PropertiesToDesign.Add("Font") dialog.PropertiesToDesign.Add("Location") dialog.PropertiesToDesign.Add("ForeColor") dialog.PropertiesToDesign.Add("BackColor") dialog.PropertiesToDesign.Add("Anchor") dialog.PropertiesToDesign.Add("Dock") dialog.PropertiesToDesign.Add("ClientSize")

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