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view Tools/DocGen/Content/Doc/ComponentModel/ObjectBinder.htm @ 6:11b6da379593
Исправлена странная ошибка при использовании OfType<...>().Where(...)
author | cin |
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date | Mon, 05 Dec 2016 05:50:52 +0300 |
parents | f990fcb411a9 |
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<p class="j"> The <b>ObjectBinder</b> component has been designed to simplify binding controls on a form to objects for FW 1.x. Since Microsoft has released FW 2.0 we can use the <b>BindingSource</b> component to bind controls to objects. However the <b>ObjectBinder</b> still can be useful as it supports a few features which are not available for the <b>BindingSource</b>. Those features are: </p> <ul> <li><p class="j">Support for field binding along with property binding.</p></li> <li><p class="j">Support for inner class field and property binding such as <i>Order.Address.Line1</i>.</p></li> <li><p class="j">Support for the <i>ObjectView</i> feature which is available by assigning an object view type to the <b>ObjectBinder.ObjectViewType</b> property. An object view is an object that implements the <b>IObjectView</b> interface. This interface includes only one property - <i>object <b>Object</b> { get; set; }</i>. An object view can implement additional properties based on the assosiated object. The <b>ObjectBinder</b> will combine all of these properties with main object properties and create a single <b>PropertyDescriptor</b> collection. This feature can be used to separate UI presentation logic from business model objects and to keep them clean. ObjectView should be a stateless, lightweight object as its single instance can be assigned to many assosiated objects.</p></li> <li><p class="j">The <b>ObjectBinder</b> is optimized for high performance applications such real-time multithreaded message processing and distribution banking systems. So it does not use reflection to access objects. The standard way (which is used by the <b>BindingSource</b>) is to call the <b>TypeDescriptor.GetProperties</b> method to get a <b>PropertyDescriptor</b> collection. This method creates property descriptors that access object properties by reflection. The <b>ObjectBinder</b> has its own mechanism to avoid unnessasy reflection and boxing/unboxing operations.</p></li> </ul> <p class="j">The dev version of BLToolkit contains a demo project (Demo\WinForms) showing the use of the <b>ObjectBinder</b>.</p>