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Environment.FailFast Method (String)

Immediately terminates a process after writing a message to the Windows Application event log, and then includes the message in error reporting to Microsoft.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

public static void FailFast(
	string message


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

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

The 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.

Use the 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.

The following example writes a log entry to the Windows Application event log and terminates the current process.

// This code example demonstrates the Environment.FailFast() 
// method.

using System;

class Sample 
    public static void Main() 
    string causeOfFailure = "A castrophic failure has occured.";

// 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.

        Console.WriteLine("This finally block will not be executed.");

This code example produces the following results:

(No output is produced 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.)


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.