Debug.Fail Method (String)

Emits the specified error message.

Namespace:  System.Diagnostics
Assemblies:   System.Diagnostics.Debug (in System.Diagnostics.Debug.dll)
  System (in System.dll)

[<ConditionalAttribute("DEBUG")>]
static member Fail : 
        message:string -> unit

Parameters

message
Type: System.String

A message to emit.

The default behavior is that the DefaultTraceListener outputs the message to a message box when the application is running in user interface mode and to the TraceListener instances in the Listeners collection.

NoteNote

The display of the message box is dependent on the presence of the DefaultTraceListener. If the DefaultTraceListener is not in the Listeners collection, the message box is not displayed. The DefaultTraceListener can be removed by the <clear> Element for <listeners> for <trace>, the <remove> Element for <listeners> for <trace>, or by calling the Clear method on the Listeners property (System.Diagnostics.Trace.Listeners.Clear()).

You can customize this behavior by adding a TraceListener to, or removing one from, the Listeners collection.

The following example uses the Fail method to print a message during exception handling.

No code example is currently available or this language may not be supported.

You can also use the Fail method in a switch statement.

No code example is currently available or this language may not be supported.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0
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