C# Windows Forms Error Handling
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them; it only takes a minute: Sign up Best Practice for Exception Handling in a Windows Forms Application? up vote 109 down vote favorite 94 I'm currently in the process of writing my first Windows Forms application. I've read
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a few C# books now so I've got a relatively good understanding of what language features C# has to deal with exceptions. They're all quite theoretical however so what I haven't got yet is a feel for how to translate the basic concepts into a good exception-handling model in my application. Would anyone like to share any pearls of wisdom on the subject? Post any common mistakes you've seen newbies like myself make, and any general advice on handling c# error handling techniques exceptions in a way that will my application more stable and robust. The main things I'm currently trying to work out are: When should I re-throw an exception? Should I try to have a central error-handling mechanism of some kind? Do handling exceptions which might be thrown have a performance hit compared with pre-emptively testing things like whether a file on disk exists? Should all executable code be enclosed in try-catch-finally blocks? Are there any times when an empty catch block might be acceptable? All advice gratefully received! c# winforms exception-handling share|improve this question edited Oct 13 '11 at 13:56 Otiel 9,63094491 asked Oct 8 '08 at 16:13 Jon Artus 2,390103039 add a comment| 15 Answers 15 active oldest votes up vote 73 down vote A few more bits ... You absolutely should have a centralized exception handling policy in place. This can be as simple as wrapping Main() in a try/catch, failing fast with a graceful error message to the user. This is the "last resort" exception handler. Preemptive checks are always correct if feasible, but not always perfect. For example, between the code where you check for a file's existence and the next line where you open it, the file could have been deleted or some other issue may impede your access. You still need try/catch/finally in that world. Use both the preemptive check and the try/catch/finally as appropriate. Never "swallow" an except
resources Windows Server c# error handling class 2012 resources Programs MSDN subscriptions Overview Benefits error handling in c# best practices Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards error handling c# mvc Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re http://stackoverflow.com/questions/183589/best-practice-for-exception-handling-in-a-windows-forms-application sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. System.Windows.Forms DataGridView Class DataGridView Events DataGridView Events DataError Event DataError Event DataError Event AllowUserToAddRowsChanged Event AllowUserToDeleteRowsChanged Event AllowUserToOrderColumnsChanged Event https://msdn.microsoft.com/en-us/library/system.windows.forms.datagridview.dataerror(v=vs.110).aspx AllowUserToResizeColumnsChanged Event AllowUserToResizeRowsChanged Event AlternatingRowsDefaultCellStyleChanged Event AutoGenerateColumnsChanged Event AutoSizeColumnModeChanged Event AutoSizeColumnsModeChanged Event AutoSizeRowsModeChanged Event BackColorChanged Event BackgroundColorChanged Event BackgroundImageChanged Event BackgroundImageLayoutChanged Event BorderStyleChanged Event CancelRowEdit Event CellBeginEdit Event CellBorderStyleChanged Event CellClick Event CellContentClick Event CellContentDoubleClick Event CellContextMenuStripChanged Event CellContextMenuStripNeeded Event CellDoubleClick Event CellEndEdit Event CellEnter Event CellErrorTextChanged Event CellErrorTextNeeded Event CellFormatting Event CellLeave Event CellMouseClick Event CellMouseDoubleClick Event CellMouseDown Event CellMouseEnter Event CellMouseLeave Event CellMouseMove Event CellMouseUp Event CellPainting Event CellParsing Event CellStateChanged Event CellStyleChanged Event CellStyleContentChanged Event CellToolTipTextChanged Event CellToolTipTextNeeded Event CellValidated Event CellValidating Event CellValueChanged Event CellValueNeeded Event CellValuePushed Event ColumnAdded Event ColumnContextMenuStripChanged Event ColumnDataPropertyNameChanged Event ColumnDefaultCellStyleChanged Event Colum
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content https://msdn.microsoft.com/en-us/library/k26k86tb(v=vs.110).aspx you requested has been removed. You’ll be auto redirected in 1 second. Windows Forms http://csharp.net-informations.com/statements/csharp-exceptions.htm Controls Controls to Use on Windows Forms BindingSource Component BindingSource Component How to: Handle Errors and Exceptions that Occur with Databinding How to: Handle Errors and Exceptions that Occur with Databinding How to: Handle Errors and Exceptions that Occur with Databinding BindingSource Component Overview BindingSource Component Architecture How to: Bind a Windows Forms Control to a Factory error handling Object How to: Bind a Windows Forms Control to a Type How to: Bind a Windows Forms Control to a Type Using the Designer How to: Bind to a Web Service Using the Windows Forms BindingSource How to: Bind Windows Forms Controls to DBNull Database Values How to: Bind Windows Forms Controls with the BindingSource Component Using the Designer How to: Create a Lookup Table with the Windows Forms BindingSource Component c# error handling How to: Customize Item Addition with the Windows Forms BindingSource How to: Handle Errors and Exceptions that Occur with Databinding How to: Raise Change Notifications Using a BindingSource and the INotifyPropertyChanged Interface How to: Raise Change Notifications Using the BindingSource ResetItem Method How to: Reflect Data Source Updates in a Windows Forms Control with the BindingSource How to: Share Bound Data Across Forms Using the BindingSource Component How to: Sort and Filter ADO.NET Data with the Windows Forms BindingSource Component TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. How to: Handle Errors and Exceptions that Occur with Databinding .NET Framework (current version) Other Versions Visual Studio 2010 .NET Framework 3.5 .NET Framework 3.0 .NET Framework 2.0 Oftentimes exceptions and errors occur on the underlying business objects when you bind them to controls. You can intercept these errors and exceptions and then either recover or pass the error information to the user by handling the BindingComplete event for a particular Binding, BindingSource, or CurrencyManager component.ExampleThis code example demonstrates how to handle errors and exceptions that occur during a data-binding operation. It demonstrates how to intercept errors by handling the Binding.BindingComplete eve
some conditions that changes the normal flow of execution . Exceptions are occurred in situations like your program run out of the memory , file does not exist in the given path , network connections are dropped etc. More specifically for better understanding , we can say it as Runtime Errors occurs during the execution of a program that disrupts the normal flow of instructions In .NET languages , Structured Exceptions handling is a fundamental part of Common Language Runtime . All exceptions in the Common Language Runtime are derived from a single base class , also you can create your own custom exception classes. You can create an exception class that inherits from Exception class . Creating an exception object and handing it to the runtime system is called throwing an exception. c# Exception Handling - try-catch C# Exception handling uses the try, catch, and finally keywords to attempt actions that may not succeed, to handle failures, and to clean up resources afterwards. try { //your code here } Catch (exception type) { //your code here }
finally The code in the finally block will execute even if there is no Exceptions. That means if you write a finally block , the code should execute after the execution of try block or catch block. try { //your code here } Catch (exception type) { //if the exception occurred //your code here } finally { //your code here } The following example trying to divide a number by zero. try { int val = 100; int div = 0; int resultVal; resultVal = (val / div); MessageBox.Show("The result is : " + resultVal); } catch (System.Exception ex) { MessageBox.Show("Exception catch here - details : " + ex.ToString()); } finally { MessageBox.Show("Enter finally block "); } How to throw Exception Exception objects that describe an error are created and then t