C# Handling Error Messages
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C# Error Handling Get Line Number
Keywords Exception Handling Statements Exception Handling Statements try-catch try-catch try-catch throw try-catch try-finally try-catch-finally TOC Collapse the table of content Expand the c# error handling framework table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. try-catch (C# Reference) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012
C# Error Handling Techniques
Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 Visual Studio .NET 2003 The try-catch statement consists of a try block followed by one or more catch clauses, which specify handlers for different exceptions. RemarksWhen an exception is thrown, the common language runtime (CLR) looks for the catch statement that handles this exception. If the currently executing method does not contain such a catch block, the CLR looks at the method that c# error handling class called the current method, and so on up the call stack. If no catch block is found, then the CLR displays an unhandled exception message to the user and stops execution of the program.The try block contains the guarded code that may cause the exception. The block is executed until an exception is thrown or it is completed successfully. For example, the following attempt to cast a null object raises the NullReferenceException exception: C# Copy object o2 = null; try { int i2 = (int)o2; // Error } Although the catch clause can be used without arguments to catch any type of exception, this usage is not recommended. In general, you should only catch those exceptions that you know how to recover from. Therefore, you should always specify an object argument derived from System.Exception For example: C# Copy catch (InvalidCastException e) { } It is possible to use more than one specific catch clause in the same try-catch statement. In this case, the order of the catch clauses is important because the catch clauses are examined in order. Catch the more specific exceptions before the less specific ones. The compiler produces an error if you order your catch blocks so that a later block can never be reached.Using catch arguments is one way to
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Error Handling In C# Best Practices
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Error Handling C# Mvc
Library MSDN Library MSDN Library Design Tools Development Tools and Languages Mobile and Embedded Development .NET Development Office development Online Services c# catch error message Open Specifications patterns & practices Servers and Enterprise Development Speech Technologies Web Development Windows Desktop App Development TOC Collapse the table of content Expand the table of content This documentation is archived and is not being https://msdn.microsoft.com/en-us/library/0yd65esw.aspx maintained. This documentation is archived and is not being maintained. How to: Display Safe Error Messages Other Versions Visual Studio 2010 .NET Framework 4 Visual Studio 2008 .NET Framework 3.0 Visual Studio 2005 When your application displays error messages, it should not give away information that a malicious user might find helpful in attacking your system. For example, if your application unsuccessfully tries to log in to a database, it should https://msdn.microsoft.com/en-us/library/994a1482.aspx not display an error message that includes the user name it is using. There are a number of ways to control error messages, including the following: Configure the application not to show verbose error messages to remote users. (Remote users are those who request pages while not working on the Web server computer.) You can optionally redirect errors to an application page. Include error handling whenever practical and construct your own error messages. In your error handler, you can test to see whether the user is local and react accordingly. Create a global error handler at the page or application level that catches all unhandled exceptions and routes them to a generic error page. That way, even if you did not anticipate a problem, at least users will not see an exception page. To configure the application to turn off errors for remote users In the Web.config file for your application, make the following changes to the customErrors element: Set the mode attribute to RemoteOnly (case-sensitive). This configures the application to show detailed errors only to local users (that is, to you, the developer). Optionally include a defaultRedirect attribute that points to an application error page. Optionally include
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 https://msdn.microsoft.com/en-us/library/system.exception.message(v=vs.110).aspx centers Retired content Samples We’re sorry. The content you requested has been https://msdn.microsoft.com/en-us/library/ms173162.aspx removed. You’ll be auto redirected in 1 second. System Exception Class Exception Properties Exception Properties Message Property Message Property Message Property Data Property HelpLink Property HResult Property InnerException Property Message Property Source Property StackTrace Property TargetSite Property TOC Collapse the table of content Expand the table of content This documentation error handling is archived and is not being maintained. This documentation is archived and is not being maintained. Exception.Message Property .NET Framework (current version) Other Versions Visual Studio 2010 .NET Framework 4 Silverlight Visual Studio 2008 .NET Framework 3.5 .NET Framework 3.0 .NET Framework 2.0 .NET Framework 1.1 Gets a message that describes the current exception.Namespace: SystemAssembly: mscorlib (in mscorlib.dll)Syntax C#C++F#VB Copy public virtual c# error handling string Message { get; } Property Value Type: System.StringThe error message that explains the reason for the exception, or an empty string ("").Implements_Exception.MessageRemarksError messages target the developer who is handling the exception. The text of the Message property should completely describe the error and, when possible, should also explain how to correct the error. Top-level exception handlers may display the message to end-users, so you should ensure that it is grammatically correct and that each sentence of the message ends with a period. Do not use question marks or exclamation points. If your application uses localized exception messages, you should ensure that they are accurately translated. Security Note Do not disclose sensitive information in exception messages without checking for the appropriate permissions. The value of the Message property is included in the information returned by ToString.The Message property is set only when creating an Exception. If no message was supplied to the constructor for the current instance, the system supplies a default message that is formatted using the current system culture.Windows Runtime and .NET Framework 4.5.1Starting with the .NET Framework 4.5.1 and Windows 8.1, the fide
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 you requested has been removed. You’ll be auto redirected in 1 second. C# C# Programming Guide Exceptions and Exception Handling Exceptions and Exception Handling Exception Handling Exception Handling Exception Handling Using Exceptions Exception Handling Creating and Throwing Exceptions Compiler-Generated Exceptions How to: Handle an Exception Using try/catch How to: Execute Cleanup Code Using finally How to: Catch a non-CLS Exception 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. Exception Handling (C# Programming Guide) Visual Studio 2015 Other Versions Visual Studio 2013 Visual Studio 2012 Visual Studio 2010 Visual Studio 2008 Visual Studio 2005 A try block is used by C# programmers to partition code that might be affected by an exception. Associated catch blocks are used to handle any resulting exceptions. A finally block contains code that is run regardless of whether or not an exception is thrown in the try block, such as releasing resources that are allocated in the try block. A try block requires one or more associated catch blocks, or a finally block, or both.The following examples show a try-catch statement, a try-finally statement, and a try-catch-finally statement. C# Copy try { // Code to try goes here. } catch (SomeSpecificException ex) { // Code to handle the exception goes here. // Only catch exceptions that you know how to handle. // Never catch base class System.Exception without // rethrowing it at the end of the catch block. } C# Copy try { // Code to try goes here. } finally { // Code to execute after