Log.WriteException Method
Definition
Important
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Writes exception information to the application's log listeners.
Overloads
| WriteException(Exception) |
Writes exception information to the application's log listeners. |
| WriteException(Exception, TraceEventType, String) |
Writes exception information to the application's log listeners. |
| WriteException(Exception, TraceEventType, String, Int32) |
Writes exception information to the application's log listeners. |
WriteException(Exception)
Writes exception information to the application's log listeners.
public:
void WriteException(Exception ^ ex);public void WriteException (Exception ex);member this.WriteException : Exception -> unitPublic Sub WriteException (ex As Exception)Parameters
- ex
- Exception
Required. Exception to log.
Exceptions
ex is Nothing.
Code with partial trust calls the method, but writes to an event log listener that requires full trust.
Examples
This example shows how to use the My.Application.Log.WriteException method to log exceptions. Uncomment the Dim and MsgBox lines to cause a NullReferenceException exception. For more information, see How to: Log Exceptions.
Public Sub ExceptionLogTest(ByVal fileName As String)
Try
' Code that might generate an exception goes here.
' For example:
' Dim x As Object
' MsgBox(x.ToString)
Catch ex As Exception
My.Application.Log.WriteException(ex,
TraceEventType.Error,
"Exception in ExceptionLogTest " &
"with argument " & fileName & ".")
End Try
End Sub
This code example can run only within a client application. Change My.Application.Log.WriteException to My.Log.WriteException for Web applications.
Remarks
The WriteException method writes the information contained in an exception to the application's event log listeners.
In client applications, the Log object is available through the My.Application.Log object. In Web applications, the Log object is available through the My.Log object.
To learn which log listeners receive the WriteException method's messages, see Walkthrough: Determining Where My.Application.Log Writes Information. You can change default log listeners. For more information, see Working with Application Logs.
For overloads that do not take the id argument, the identifier written to the log is defined by the following table.
severity |
Default id |
|---|---|
| Information | 0 |
| Warning | 1 |
| Error | 2 |
| Critical | 3 |
| Start | 4 |
| Stop | 5 |
| Suspend | 6 |
| Resume | 7 |
| Verbose | 8 |
| Transfer | 9 |
The following table lists examples of tasks involving the WriteException method.
| To | See |
|---|---|
| Write exception information to the application's event log listeners. | How to: Log Exceptions |
Determine where Log writes information. |
Walkthrough: Determining Where My.Application.Log Writes Information |
Availability by Project Type
| Project type | Available |
|---|---|
| Windows Application | Yes |
| Class Library | Yes |
| Console Application | Yes |
| Windows Control Library | Yes |
| Web Control Library | No |
| Windows Service | Yes |
| Web Site | Yes |
See also
- Exception
- TraceEventType
- Objects (Visual Basic)
- Working with Application Logs in Visual Basic
- How to: Log Exceptions in Visual Basic
- Walkthrough: Determining Where My.Application.Log Writes Information
Applies to
WriteException(Exception, TraceEventType, String)
Writes exception information to the application's log listeners.
public:
void WriteException(Exception ^ ex, System::Diagnostics::TraceEventType severity, System::String ^ additionalInfo);public void WriteException (Exception ex, System.Diagnostics.TraceEventType severity, string additionalInfo);member this.WriteException : Exception * System.Diagnostics.TraceEventType * string -> unitPublic Sub WriteException (ex As Exception, severity As TraceEventType, additionalInfo As String)Parameters
- ex
- Exception
Required. Exception to log.
- severity
- TraceEventType
The type of message. By default, Error.
- additionalInfo
- String
String to append to the message. By default, this is an empty string.
Exceptions
ex is Nothing.
The message type is not one of the TraceEventType enumeration values.
Code with partial trust calls the method, but writes to an event log listener that requires full trust.
Examples
This example shows how to use the My.Application.Log.WriteException method to log exceptions. Uncomment the Dim and MsgBox lines to cause a NullReferenceException exception. For more information, see How to: Log Exceptions.
Public Sub ExceptionLogTest(ByVal fileName As String)
Try
' Code that might generate an exception goes here.
' For example:
' Dim x As Object
' MsgBox(x.ToString)
Catch ex As Exception
My.Application.Log.WriteException(ex,
TraceEventType.Error,
"Exception in ExceptionLogTest " &
"with argument " & fileName & ".")
End Try
End Sub
This code example can run only within a client application. Change My.Application.Log.WriteException to My.Log.WriteException for Web applications.
Remarks
The WriteException method writes the information contained in an exception to the application's event log listeners.
In client applications, the Log object is available through the My.Application.Log object. In Web applications, the Log object is available through the My.Log object.
To learn which log listeners receive the WriteException method's messages, see Walkthrough: Determining Where My.Application.Log Writes Information. You can change default log listeners. For more information, see Working with Application Logs.
For overloads that do not take the id argument, the identifier written to the log is defined by the following table.
severity |
Default id |
|---|---|
| Information | 0 |
| Warning | 1 |
| Error | 2 |
| Critical | 3 |
| Start | 4 |
| Stop | 5 |
| Suspend | 6 |
| Resume | 7 |
| Verbose | 8 |
| Transfer | 9 |
The following table lists examples of tasks involving the WriteException method.
| To | See |
|---|---|
| Write exception information to the application's event log listeners. | How to: Log Exceptions |
Determine where Log writes information. |
Walkthrough: Determining Where My.Application.Log Writes Information |
Availability by Project Type
| Project type | Available |
|---|---|
| Windows Application | Yes |
| Class Library | Yes |
| Console Application | Yes |
| Windows Control Library | Yes |
| Web Control Library | No |
| Windows Service | Yes |
| Web Site | Yes |
See also
- Exception
- TraceEventType
- Objects (Visual Basic)
- Working with Application Logs in Visual Basic
- How to: Log Exceptions in Visual Basic
- Walkthrough: Determining Where My.Application.Log Writes Information
Applies to
WriteException(Exception, TraceEventType, String, Int32)
Writes exception information to the application's log listeners.
public:
void WriteException(Exception ^ ex, System::Diagnostics::TraceEventType severity, System::String ^ additionalInfo, int id);public void WriteException (Exception ex, System.Diagnostics.TraceEventType severity, string additionalInfo, int id);member this.WriteException : Exception * System.Diagnostics.TraceEventType * string * int -> unitPublic Sub WriteException (ex As Exception, severity As TraceEventType, additionalInfo As String, id As Integer)Parameters
- ex
- Exception
Required. Exception to log.
- severity
- TraceEventType
The type of message. By default, Error.
- additionalInfo
- String
String to append to the message. By default, this is an empty string.
- id
- Int32
Message identifier, typically used for correlation. By default, related to entryType as described in the table in the Remarks section.
Exceptions
ex is Nothing.
The message type is not one of the TraceEventType enumeration values.
Code with partial trust calls the method, but writes to an event log listener that requires full trust.
Examples
This example shows how to use the My.Application.Log.WriteException method to log exceptions. Uncomment the Dim and MsgBox lines to cause a NullReferenceException exception. For more information, see How to: Log Exceptions.
Public Sub ExceptionLogTest(ByVal fileName As String)
Try
' Code that might generate an exception goes here.
' For example:
' Dim x As Object
' MsgBox(x.ToString)
Catch ex As Exception
My.Application.Log.WriteException(ex,
TraceEventType.Error,
"Exception in ExceptionLogTest " &
"with argument " & fileName & ".")
End Try
End Sub
This code example can run only within a client application. Change My.Application.Log.WriteException to My.Log.WriteException for Web applications.
Remarks
The WriteException method writes the information contained in an exception to the application's event log listeners.
In client applications, the Log object is available through the My.Application.Log object. In Web applications, the Log object is available through the My.Log object.
To learn which log listeners receive the WriteException method's messages, see Walkthrough: Determining Where My.Application.Log Writes Information. You can change default log listeners. For more information, see Working with Application Logs.
For overloads that do not take the id argument, the identifier written to the log is defined by the following table.
severity |
Default id |
|---|---|
| Information | 0 |
| Warning | 1 |
| Error | 2 |
| Critical | 3 |
| Start | 4 |
| Stop | 5 |
| Suspend | 6 |
| Resume | 7 |
| Verbose | 8 |
| Transfer | 9 |
The following table lists examples of tasks involving the WriteException method.
| To | See |
|---|---|
| Write exception information to the application's event log listeners. | How to: Log Exceptions |
Determine where Log writes information. |
Walkthrough: Determining Where My.Application.Log Writes Information |
Availability by Project Type
| Project type | Available |
|---|---|
| Windows Application | Yes |
| Class Library | Yes |
| Console Application | Yes |
| Windows Control Library | Yes |
| Web Control Library | No |
| Windows Service | Yes |
| Web Site | Yes |
See also
- Exception
- TraceEventType
- Objects (Visual Basic)
- Working with Application Logs in Visual Basic
- How to: Log Exceptions in Visual Basic
- Walkthrough: Determining Where My.Application.Log Writes Information
