![]() The Control class handles user input through the keyboard and mouse. Some drag-and-drop functionality is built into the Control class, which implements very basic functionality required by classes that display information to the user. Turning that value to true is the first and key step to enabling drag-and-drop in a form or a control. NET components allowed in a Windows form have a Boolean property named AllowDrop, which is set to False by default. Enabling Drag-and-Drop in Forms and ControlsĪll. Things were much easier for Visual Basic developers and you'll still find that model at the root of the. Implementing drag-and-drop, though, remained a sort of nightmare for most programmers. The advent of OLE made the drag-and-drop transition from messages to functions and generalized the format of the data being moved. ![]() Drag-and-drop has existed for a long time in Windows and had its first fully message-based SDK available with Windows for Workgroups in an earlier software era. It makes transferring data from one control to the next, and from and to other applications and to the Windows shell itself, into a straightforward activity. The first step to enable drag-and-drop in a form or control is setting the AllowDrop property to True.Īs a matter of fact, drag-and-drop greatly simplifies how people use virtually any application. Yet drag-and-drop is a feature that, if missing, users promptly miss and are quick to add to the wish list for the next upgrade. Drag-and-drop is not the solution to any core business issues and doesn't add any new functionality to the application. Sure, drag-and-drop doesn't make your application run faster, nor does it add anything to the core business of the application. Notable examples are the TextBox and the PictureBox controls.ĭrag-and-drop is one of those programming features rarely listed in the user requirements document because it is perceived as secondary and minor. This article demonstrates how to import files from the Windows shell and how to enhance some UI controls to make them accept input via drag-and-drop. ![]() By accomplishing a few mandatory steps and working with the information available in the event arguments, you can easily facilitate dragging and dropping files, text, and any other sort of serializable data objects. In Windows Forms applications, drag-and-drop operations consist mostly of handling a series of events. If you want to capture your users' imaginations, enable drag-and-drop.ĭrag-and-drop doesn't fulfill requirements, but it contributes to making your application appear more professional and easy to use.
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