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DefaultTraceListener.Fail Method (String)

Emits or displays a message and a stack trace for an assertion that always fails.

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

public override void Fail(
	string message
)

Parameters

message
Type: System.String

The message to emit or display.

By default, this method sends the message parameter and a stack trace to a message box (when the application runs in user-interface mode) and to the DefaultTraceListener instance.

The following code example writes an error message to a DefaultTraceListener using the Fail(String) method. The method also writes the message to the console if a user interface is not available.

// Report that the required argument is not present. 
const string ENTER_PARAM = "Enter the number of " +
          "possibilities as a command line argument.";
defaultListener.Fail(ENTER_PARAM);
if (!defaultListener.AssertUiEnabled)
{
    Console.WriteLine(ENTER_PARAM);
}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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