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if (dlgShowDialog() == DialogResultOK) Caching { return new Dog(dlgDogNameText, State management (eBreed)EnumParse(typeof(eBreed), dlgDogBreedSelectedItemToString()),
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Int32Parse(dlgDogAgeText)); [ Team LiB ] } else return obj; // no change } public override UITypeEditorEditStyle GetEditStyle(ITypeDescriptorContext tdc) { return UITypeEditorEditStyleModal; } } // To hook up this editor to the Dog structure: [Editor(typeof(DogEditor), typeof(UITypeEditor))] Table of public struct Dog Contents { /**/ Essential}ASPNET with Examples in C#
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ByFritz Onion
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864 Designers Publisher : Addison Wesley
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Pub Date : February 11, 2003
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For each control you create, you can create an accompanying designer class that determines how that ISBN : 0-201-76040-1 control appears and behaves within the designer For many controls, this is unnecessary because the Visual Pages : 432 Studio NET designer creates an instance of your control when it is placed on a form and asks it to render itself For controls whose rendering depends on runtime data population or that have no visual presence on a form, however, it makes sense to have something show up when such controls are dropped on a form in the designer Whether this means artificially populating a control with initial data or providing a "stub" "This well-conceived that it is a placeholder has extensive knowledge and priceless experience overflowing rendering indicating and well-written book depends on the type of control 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 Creating a designer involves creating a new class derived from
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SystemWebUIDesignControlDesigner and overriding its GetDesignTimeHtml method This Essential ASPNET withthe HTML youC# is to represent your control at design time The last step is to method should return Examples in want the C# programmer's definitive reference for ASPNET through version 11 Itdesigner with your control class by using the Designer attribute to fully 8-45 shows the associate the provides experienced programmers with the information needed Listing understand a custom technology, and isan clear guide designerASPNET to build demonstrates the common practice of placing the control class with a associated to using This listing also robust and well architected Web applications
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designer in a new namespace called Design within the control class's namespace 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, Listing 8-45 A Custom Control with an Associated Designer Class including the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate best practices for building Web-based applications in C#
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namespace Design { Among the topics explored in depth are: public class MyControlDesigner : ControlDesigner { ASPNET architecture public override string GetDesignTimeHtml() { Web forms "<h3>MyControl in design mode!</h3>"; return } } Configuration }
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[Designer(typeof(DesignMyControlDesigner))] Diagnostics and error handling public class MyControl : Control { /**/ } Validation
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Data binding Providing a designer for a control does not change the fact that an instance of your control is created in design mode; controls changes how that control renders itself in a designer For controls that want to use Custom it merely the standard control rendering in their designer, it is possible to reference the control instance from within the designer via the Component property of the ControlDesigner class A good example of when this Caching would be appropriate is in the BarGraph control presented earlier in this chapter This control renders a bar graph State data populated at runtime, so at design time there is nothing to render To give it a visual with management presence in the designer, we can access the allocated instance of the control, populate it with some artificial
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data, and return the result of invoking the control's render function (by calling the base class [ Team LiB ] implementation of GetDesignTimeHtml) This technique is shown in Listing 8-46 Listing 8-46 Using a Designer to Artificially Populate the BarGraph Control
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public class BarGraphDesigner : ControlDesigner { bool bGetDesignTimeHtmlCalled = false; public override string GetDesignTimeHtml() { // populate with data the first time only if (!bGetDesignTimeHtmlCalled) { Table of Contents BarGraphControl ctrl = (BarGraphControl)Component; Essential ASPNET with Examples in C# // add some artifical data ByFritz Onion ctrlAddValue("Value 1", 100); ctrlAddValue("Value 2", 200); ctrlAddValue("Value 3", 300); Publisher : Addison Wesley ctrlAddValue("Value 4", 400); Pub Date : February 11, 2003 bGetDesignTimeHtmlCalled = true; ISBN : 0-201-76040-1 } Pages : 432 return baseGetDesignTimeHtml(); } }
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages of controls that true essence of ASPNET and walks the reader to a high level of technical and The other type It captures the require designers are those that have no runtime rendering or whose architectural skill"-J Fred many runtime elements, making renderingNASDAQcom rendering depends on too Maples, Director of Software Engineering, in design mode impossible For these controls, a helper function called CreatePlaceHolderDesignTimeHtml creates a standard placeholder for Essential ASPNET with takes a string and renders programmer's definitive reference for ASPNET time, and is a control This method Examples in C# is the C# a gray box with the string displayed at design through version 11 It provides experienced programmers with the information needed to fully understand the used by controls such as the Xml control and the Repeater control in the base class libraries Listing 8-47 technology, and designer that renders a placeholder build robust and well architected Web applications shows a sample is a clear guide to using ASPNET to This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how Listing 8-47 Rendering a Placeholder with a Designer 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 development Throughout the book, working examples illustrate public class MyControlDesigner : ControlDesigner best practices for building Web-based applications in C#
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public override string GetDesignTimeHtml() Among the topics explored in depth are: { return CreatePlaceHolderDesignTimeHtml("see me later"); } ASPNET architecture }
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Web forms Configuration [ Team LiB ] HTTP pipeline Diagnostics and error handling Validation Data binding Custom controls Caching State management
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