Applying a Type Converter to a Type Web forms in VS .NET

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Listing 8-43 Applying a Type Converter to a Type Web forms
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[TypeConverter(typeof(DogConverter))] public struct Dog HTTP pipeline { Diagnostics and error handling // }
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Validation Data binding Once a property has a valid converter associated with it, the designer lets the user modify the property value through the property window, taking whatever string is passed in, running it through the converter, Custom controls and assigning it to the control's property If you would like the user to be able to edit the subproperties of your type individually, you can derive your type converter from a special derivative of TypeConverter Caching called ExpandableObjectTypeConverterFigure 8-7 shows what the property editor looks like when the DogConverter class is derived from ExpandableObjectTypeConverter State management
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Figure 8-7 Expandable Properties
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Table of Contents
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Essential ASPNET with Examples in C#
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ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pagesEditors 863 Property It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom
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Some control authors may want to take this one step further and provide their own custom editors for users Essential ASPNET with Examples in C# isusers type a formatted definitive the property editor, they can to edit properties with Instead of having the C# programmer's string in reference for ASPNET through version 11 It provides experienced programmers with theor dialog to edit the property Several built-in associate an editor with a property that can launch a form information needed to fully understand the technology,available,clear guidein Table 8-7 editors are and is a as shown to using ASPNET to build robust and well architected Web applications
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control Table 8-7 Built-in Editors book, working examples illustrate development Throughout the best practices for building Web-based applications in C#
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Editor Class Among the topics explored in depth are:
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DataBindingCollectionEditor ImageUrlEditor UrlEditor
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Web forms XmlFileEditor ASPNET architecture
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XmlUrlEditor XslUrlEditor
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For an example of using a custom editor, consider a class that maintains a URL property If would be nice if Diagnostics users type in any random string for this property, there were a selection dialog that helped instead of having and error handling them construct a proper URL By using the Editor attribute on the string property used to access and set Validation the URL, the control builder can associate the built-in UrlEditor class to do just this, as shown in Figure 88 Note that the Editor takes two parameters, the type of the editor class and the base class from which it Data binding inherits, which currently should always be SystemDrawingDesignUITypeEditor
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Custom controls Figure 8-8 Associating a Custom Editor with a Control Property Caching State management
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Table of Contents
Essential ASPNET with Examples in C#
ByFritz Onion Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom
To create your own custom editor for a property, you derive a new class from Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through SystemDrawingDesignUITypeEditor and override the EditValue and GetEditStyle methods The version 11 It provides experienced programmers with the information needed to fully understand the GetEditStyle returns an enumeration indicating what type of user interface the editor is going to use: technology, and is a clear guide to using ASPNET to build robust and well architected Web applications modal dialog, drop-down box from within the property list, or none EditValue takes a reference to the object it is editing and returns a new object with new values What happens inside EditValue is completely This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how up to you, but most often it invokes a modal dialog box with controls on it to edit the values for the object it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, Listing 8-44 shows an example of a custom editor for editing the Dog structure shown earlier and how to including the server-side compilation model, code-behind classes, server-side controls, form validation, the hook it up to the Dog structure using the Editor attribute data binding model, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C# Listing 8-44 A Custom Editor Example
Among the topics explored in depth are:
public class DogEditor : UITypeEditor ASPNET architecture { public override object EditValue( Web forms ITypeDescriptorContext tdc, IServiceProvider sp, object obj) { Configuration Dog dg = (Dog)obj; HTTP pipeline // DogEditorDlg class now shown DogEditorDlg dlg = new DogEditorDlg(); dlgDogNameText = dgName; Validation dlgDogAgeText = dgAgeToString(); dlgDogBreedSelectedIndex = Data binding dlgDogBreedItemsIndexOf(dgBreedToString());