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Trace.Fail Method

Definition

Emits an error message.

Overloads

Fail(String)

Emits the specified error message.

Fail(String, String)

Emits an error message, and a detailed error message.

Fail(String)

Source:
Trace.cs
Source:
Trace.cs
Source:
Trace.cs

Emits the specified error message.

[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string? message);
[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string message);

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)
{
    Trace.Fail("Unknown Option " + option + ", using the default.");
}

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

switch (option)
{
    case Option.First:
        result = 1.0;
        break;

    // Insert additional cases.
    default:
        Trace.Fail("Unknown Option " + option);
        result = 1.0;
        break;
}

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

Fail(String, String)

Source:
Trace.cs
Source:
Trace.cs
Source:
Trace.cs

Emits an error message, and a detailed error message.

[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string? message, string? detailMessage);
[System.Diagnostics.Conditional("TRACE")]
public static void Fail (string message, string detailMessage);

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)
{
    Trace.Fail("Invalid value: " + value.ToString(),
       "Resetting value to newValue.");
    value = newValue;
}

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

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;
}

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