Extended Error Provider In Vb.net
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Creating a custom ErrorProvider component for use with Windows Forms applications Blog Articles and information on C# and .NET development topics Creating a custom ErrorProvider component for use with Windows Forms applications 01 January 2013 Richard Moss c# | IExtenderProvider | ErrorProvider | ProviderProperty 1 comment Files In recent code, I've been trying to avoid displaying validation errors as message boxes, but display something in-line. The .NET Framework provides an ErrorProvider component which does just this. One of the disadvantages of this control is that it displays an icon indicating error state - which means you need a chunk of white space somewhere around your control, which may not always be very desirable. This article describes how to create a custom http://www.codeproject.com/Articles/11904/Extended-Error-Provider error provider component that uses background colours and tool tips to indicate error state. Note: I don't use data binding, so the provider implementation I demonstrate below currently has no support for this. Getting Started Create a new Component class and implement the IExtenderProvider interface. This interface is used to add custom properties to other controls - it has a single method CanExtend that must return true for a given http://www.cyotek.com/blog/creating-a-custom-errorprovider-component-for-use-with-windows-forms-applications source object if it can extend itself to said object. In this example, we'll offer our properties to any control. However, you can always customize this to work only with certain control types such as TextBoxBase, ListBoxControl etc. bool IExtenderProvider.CanExtend(object extendee) { return extendee is Control; } Implementing Custom Properties Unlike how properties are normally defined, you need to create get and set methods for each property you wish to expose. In our case, we'll be offering Error and ErrorBackColor properties. Using Error as an example, the methods would be GetError and SetError. Both methods need to have a parameter for the source object, and the set also needs a parameter for the property value. Note: I named this property Error so I could drop in replace the new component for the .NET Framework one without changing any code bar the control declaration. If you don't plan on doing this, you may wish to name it ErrorText or something more descriptive! In this example, we'll store all our properties in dictionaries, keyed on the source control. If you want to be more efficient, rather than using multiple dictionaries you could use one tied to a backing class/structure but we'll keep this example nice and simple. Below is the implementation for
UsConsultingConsulting HomeServices & TechnologiesVFP ConversionAzure & Other CloudsEnergy SoftwareContact UsStaffingStaffing HomeLooking for Staff?Looking for Work?Contact UsMagazineMagazine HomeAll IssuesSubscribeMy (Digital) MagazinesWhere is my Magazine?My Subscriber AccountAdvertiseWriteFrameworkFramework HomeGet Started & DocumentationDownloadSupport & ServicesTrainingTraining HomeClassesMentoringState of .NETLunch with CODECode CampsASP.NET MVCDevNet TrainingVFP ConversionVFP Conversion HomeServicesToolsArticlesFox End of LifeContact UsSign in! Advertisement: Working http://www.codemag.com/article/0301041 with Extender Classes By John V. Petersen Tweet John V. Petersen John Petersen has been developing software for over 20 years. It all started when, as a staff accountant, he was asked to http://kkchoh.blogspot.com/2010/09/vbnet-how-to-extend-custom-method-to.html get involved in a system upgrade to replace an old IBM Series 1 computer (about the size of a large refrigerator!). Those first programs were written in Clipper, Summer 87. Since that time, extended error John’s tools included dBase, FoxBase, Visual FoxPro and Visual Basic. An early adopter of .NET, he then decided to go to law school. After practicing law for a few years, John realized that technology was a lot more interesting than the law. Today, John focuses on ASP.NET development and is having more fun than ever solving business problems for clients. John is a Practice Director extended error provider for Custom Application Development at Neudesic, a Microsoft Gold Partner and the Trusted Technology Partner in Business Innovation. A 9-time recipient of Microsoft’s Most Valuable Professional Award, John is a current ASP.NET/IIS MVP. John is also an ASP Insider and is the INETA Mentor for PA and WV. John is the author of several books and is a frequent contributor to CODE Magazine and DevPro magazine. John holds a BS in Business Administration from Mansfield University, an MBA in Information Systems from St. Joseph’s University and a JD from the Rutgers School of Law – Camden. email: johnvpetersen@gmail.comblog: codebetter.com/johnvpetersentwitter: @johnvpetersen This article was published in: This article was filed under: .NET Assemblies .NET Framework VB.NET Object Oriented Development Advertisement: Extender classes do just that; they allow you to extend the functionality of a .NET control class. The Error Provider and Tooltip classes are two examples of extender classes in the .NET Framework. The Tooltip class represents a significant departure from how tooltips were implemented in earlier versions of Visual Studio. The Error Provider class provides a new way to inform users about invalid input. Although each class serves a different purpose, their implementation is
very simple, instead of coding the Error Provider Control to validate field one by one; we add custom functionality to Error Provider that can be call without creating a new derived type. For exampleFrom:If String.IsNullOrEmpty(Textbox1.Text.Trim) Then ErrorProvider1.SetError(Textbox1, "The field cannot be empty!")Else ErrorProvider1.SetError(Textbox1,Nothing)End If If String.IsNullOrEmpty(Textbox2.Text.Trim) Then ErrorProvider1.SetError(Textbox2, "The field cannot be empty!")Else ErrorProvider1.SetError(Textbox2,Nothing)End If To:ErrorProvider1.Validate(TextBox1, "This field cannot be empty!")ErrorProvider1.Validate(TextBox2, "This field cannot be blank!")If ErrorPrivider1.HasError Then MessageBox.Show(ErrorProvider.GetErrorMessages())‘ Error routine hereEnd If Here is my code in VB.Net: Step one: Create a new module Imports System.Runtime.CompilerServicesImports System.Text Namespace ErrorProviderExtension Module ErrorExtension