Trace.Fail Method
Important
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Emits an error message.
Fail(String) |
Emits the specified error message. |
Fail(String, String) |
Emits an error message, and a detailed error message. |
- Source:
- Trace.cs
- Source:
- Trace.cs
- Source:
- Trace.cs
Emits the specified error message.
public:
static void Fail(System::String ^ message);
[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string? message);
[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string message);
[<System.Diagnostics.Conditional("TRACE")>]
static member Fail : string -> unit
Public Shared Sub Fail (message As String)
Parameters
- message
- String
A message to emit.
- Attributes
Examples
The following example uses the Fail method to print a message during exception handling.
catch ( Exception^ )
{
#if defined(TRACE)
Trace::Fail( "Unknown Option " + option + ", using the default." );
#endif
}
catch (Exception)
{
Trace.Fail("Unknown Option " + option + ", using the default.");
}
Catch
Trace.Fail("Unknown Option " + option1 + ", using the default.")
End Try
You can also use the Fail method in a switch statement.
switch ( option )
{
case Option::First:
result = 1.0;
break;
// Insert additional cases.
default:
#if defined(TRACE)
Trace::Fail(String::Format("Unknown Option {0}", option));
#endif
result = 1.0;
break;
}
switch (option)
{
case Option.First:
result = 1.0;
break;
// Insert additional cases.
default:
Trace.Fail("Unknown Option " + option);
result = 1.0;
break;
}
Select Case option1
Case OptionConsts.First
result = 1.0
' Insert additional cases.
Case Else
Trace.Fail(("Unknown Option " & option1))
result = 1.0
End Select
Remarks
The default behavior for the default trace listener is to output the message
parameter to a message box when the application runs in user-interface mode, and to the TraceListener instances in the Listeners collection.
Megjegyzés
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>, the <remove>, 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 by removing one from, the Listeners collection.
See also
Applies to
.NET 9 és más verziók
Termék | Verziók |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
- Source:
- Trace.cs
- Source:
- Trace.cs
- Source:
- Trace.cs
Emits an error message, and a detailed error message.
public:
static void Fail(System::String ^ message, System::String ^ detailMessage);
[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string? message, string? detailMessage);
[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string message, string detailMessage);
[<System.Diagnostics.Conditional("TRACE")>]
static member Fail : string * string -> unit
Public Shared Sub Fail (message As String, detailMessage As String)
Parameters
- message
- String
A message to emit.
- detailMessage
- String
A detailed message to emit.
- Attributes
Examples
The following example uses the Fail method to print a message during exception handling.
catch ( Exception^ )
{
#if defined(TRACE)
Trace::Fail( String::Format( "Invalid value: {0}", value ),
"Resetting value to newValue." );
#endif
value = newValue;
}
catch (Exception)
{
Trace.Fail("Invalid value: " + value.ToString(),
"Resetting value to newValue.");
value = newValue;
}
Catch
Trace.Fail("Invalid value: " & value.ToString(), _
"Resetting value to newValue.")
value = newValue
End Try
You can also use the Fail method in a switch statement.
switch ( option )
{
case Option::First:
result = 1.0;
break;
// Insert additional cases.
default:
#if defined(TRACE)
Trace::Fail( String::Format( "Unsupported option {0}", option ),
"Result set to 1.0" );
#endif
result = 1.0;
break;
}
switch (option)
{
case Option.First:
result = 1.0;
break;
// Insert additional cases.
default:
Trace.Fail("Unsupported option " + option, "Result set to 1.0");
result = 1.0;
break;
}
Select Case option1
Case OptionConsts.First
result = 1.0
' Insert additional cases.
Case Else
Trace.Fail("Unsupported option " & option1, "Result set to 1.0")
result = 1.0
End Select
Remarks
The default behavior is for the default trace listener to output the message
parameter and the detailedMessage
parameter to a message box when the application runs in user-interface mode, and to the TraceListener instances in the Listeners collection.
Megjegyzés
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>, the <remove>, 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 by removing one from, the Listeners collection.
See also
Applies to
.NET 9 és más verziók
Termék | Verziók |
---|---|
.NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
.NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
.NET Standard | 2.0, 2.1 |
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