Environment.FailFast Method

Definition

Namespace:

System

Assembly:

System.Runtime.dll

Immediately terminates the process before reporting an error message. For Windows, the error message is written to the Windows Application event log, and the message and optional exception information is included in error reporting to Microsoft. For Unix-like systems, the message, alongside the stack trace, is written to the standard error stream.

Overloads

FailFast(String)	Immediately terminates the process before reporting an error message. For Windows, the error message is written to the Windows Application event log, and the message is included in error reporting to Microsoft. For Unix-like systems, the message, alongside the stack trace, is written to the standard error stream.
FailFast(String, Exception)	Immediately terminates the process before reporting an error message. For Windows, the error message is written to the Windows Application event log, and the message and exception information is included in error reporting to Microsoft. For Unix-like systems, the message alongside the stack trace is written to the standard error stream.

FailFast(String)

Source:

Environment.cs

Immediately terminates the process before reporting an error message. For Windows, the error message is written to the Windows Application event log, and the message is included in error reporting to Microsoft. For Unix-like systems, the message, alongside the stack trace, is written to the standard error stream.

public:
 static void FailFast(System::String ^ message);

public static void FailFast (string? message);

static member FailFast : string -> unit

Public Shared Sub FailFast (message As String)

Parameters

message

String

A message that explains why the process was terminated, or null if no explanation is provided.

Examples

The following example writes a log entry to the Windows Application event log when running under Windows, or writes the error message to the standard error stream when running under a Unix-like system, and terminates the current process.

using System;

class Example
{
    public static void Main()
    {
       string causeOfFailure = "A catastrophic failure has occurred.";

       // Assume your application has failed catastrophically and must
       // terminate immediately. The try-finally block is not executed
       // and is included only to demonstrate that instructions within
       // try-catch blocks and finalizers are not performed.
       try
       {
           Environment.FailFast(causeOfFailure);
       }
       finally
       {
           Console.WriteLine("This finally block will not be executed.");
       }
   }
}
/*
The example produces no output because the application is terminated.
However, an entry is made in the Windows Application event log, and
the log entry contains the text from the causeOfFailure variable.
*/

open System

let causeOfFailure = "A catastrophic failure has occurred."

// Assume your application has failed catastrophically and must
// terminate immediately. The try-finally block is not executed
// and is included only to demonstrate that instructions within
// try-catch blocks and finalizers are not performed.
try
    Environment.FailFast causeOfFailure
finally
    printfn "This finally block will not be executed."

// The example produces no output because the application is terminated.
// However, an entry is made in the Windows Application event log, and
// the log entry contains the text from the causeOfFailure variable.

Module Example
    Public Sub Main()
        Dim causeOfFailure As String = "A catastrophic failure has occurred."
        ' Assume your application has failed catastrophically and must
        ' terminate immediately. The try-finally block is not executed 
        ' and is included only to demonstrate that instructions within 
        ' try-catch blocks and finalizers are not performed.

        Try
            Environment.FailFast(causeOfFailure)
        Finally
            Console.WriteLine("This finally block will not be executed.")
        End Try
    End Sub
End Module
'
' The code example displays no output because the application is
' terminated. However, an entry is made in the Windows Application event
' log, and the log entry contains the text from the causeOfFailure variable.

Remarks

This method terminates a process without running any active try/finally blocks or finalizers.

On Windows, the Environment.FailFast method writes the message string to the Windows Application event log, creates a dump of your application, and then terminates the current process. The message string is also included in error reporting to Microsoft via Windows Error Reporting. For more information, see Windows Error Reporting: Getting Started.

On Unix-like systems, the message is written to the standard error stream, alongside the stack trace information.

Use the Environment.FailFast method instead of the Exit method to terminate your application if the state of your application is damaged beyond repair, and executing your application's try/finally blocks and finalizers will corrupt program resources.

Calling the Environment.FailFast method to terminate execution of an application running in the Visual Studio debugger throws an ExecutionEngineException and automatically triggers the fatalExecutionEngineError managed debugging assistant (MDA).

FailFast(String, Exception)

Source:

Environment.cs

Immediately terminates the process before reporting an error message. For Windows, the error message is written to the Windows Application event log, and the message and exception information is included in error reporting to Microsoft. For Unix-like systems, the message alongside the stack trace is written to the standard error stream.

public:
 static void FailFast(System::String ^ message, Exception ^ exception);

public static void FailFast (string? message, Exception? exception);

static member FailFast : string * Exception -> unit

Public Shared Sub FailFast (message As String, exception As Exception)

Parameters

message

String

A message that explains why the process was terminated, or null if no explanation is provided.

exception

Exception

An exception that represents the error that caused the termination. This is typically the exception in a catch block.

Remarks

This method terminates the process without running any active try/finally blocks or finalizers.

On Windows, the Environment.FailFast method writes the message string to the Windows Application event log, creates a dump of your application, and then terminates the current process.

Information is reported to Microsoft by using Windows Error Reporting. For more information, see Windows Error Reporting: Getting Started. Error reporting to Microsoft includes message and exception information, which provides details used to classify the error. Although exception is not handled because the process is terminated, the contextual information that raised the exception is still obtained.

On Unix-like systems, the message is written to the standard error stream, alongside the stack trace information.

If exception is null, or if exception is not thrown, this method operates the same as the FailFast(String) method overload.

Use the Environment.FailFast method instead of the Exit method to terminate your application if the state of your application is damaged beyond repair, and executing your application's try/finally blocks and finalizers will corrupt program resources.

Calling the Environment.FailFast method to terminate execution of an application running in the Visual Studio debugger throws an ExecutionEngineException and automatically triggers the fatalExecutionEngineError managed debugging assistant (MDA).