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AutoFlushTargetWrapper Class

Causes a flush on a wrapped target if LogEvent satisfies the Condition. If condition isn't set, flushes on each write.
Inheritance Hierarchy
SystemObject
  NLog.TargetsTarget
    NLog.Targets.WrappersWrapperTargetBase
      NLog.Targets.WrappersAutoFlushTargetWrapper

Namespace:  NLog.Targets.Wrappers
Assembly:  NLog (in NLog.dll) Version: 5.3.4+73d83d3161d31288ca5c554cc50d27b6bed5f28b
Syntax
public class AutoFlushTargetWrapper : WrapperTargetBase

The AutoFlushTargetWrapper type exposes the following members.

Constructors
  NameDescription
Public methodAutoFlushTargetWrapper
Initializes a new instance of the AutoFlushTargetWrapper class.
Public methodAutoFlushTargetWrapper(Target)
Initializes a new instance of the AutoFlushTargetWrapper class.
Public methodAutoFlushTargetWrapper(String, Target)
Initializes a new instance of the AutoFlushTargetWrapper class.
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Properties
  NameDescription
Public propertyAsyncFlush
Delay the flush until the LogEvent has been confirmed as written
Public propertyCondition
Gets or sets the condition expression. Log events who meet this condition will cause a flush on the wrapped target.
Public propertyFlushOnConditionOnly
Only flush when LogEvent matches condition. Ignore explicit-flush, config-reload-flush and shutdown-flush
Protected propertyIsInitialized
Gets a value indicating whether the target has been initialized.
(Inherited from Target.)
Protected propertyLoggingConfiguration
Gets the logging configuration this target is part of.
(Inherited from Target.)
Public propertyName
Gets or sets the name of the target.
(Inherited from Target.)
Protected propertySyncRoot
Gets the object which can be used to synchronize asynchronous operations that must rely on the .
(Inherited from Target.)
Public propertyWrappedTarget
Gets or sets the target that is wrapped by this target.
(Inherited from WrapperTargetBase.)
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Methods
  NameDescription
Protected methodCloseTarget
Closes the target to release any initialized resources
(Overrides TargetCloseTarget.)
Public methodDispose
Closes the target.
(Inherited from Target.)
Protected methodDispose(Boolean)
Releases unmanaged and - optionally - managed resources.
(Inherited from Target.)
Public methodFlush
Flush any pending log messages (in case of asynchronous targets).
(Inherited from Target.)
Protected methodFlushAsync
Schedules a flush operation, that triggers when all pending flush operations are completed (in case of asynchronous targets).
(Overrides WrapperTargetBaseFlushAsync(AsyncContinuation).)
Protected methodInitializeTarget
Initializes the target before writing starts
(Overrides TargetInitializeTarget.)
Public methodPrecalculateVolatileLayouts
Calls the Precalculate(LogEventInfo) on each volatile layout used by this target. This method won't prerender if all layouts in this target are thread-agnostic.
(Inherited from Target.)
Protected methodRenderLogEvent(Layout, LogEventInfo)
Renders the logevent into a string-result using the provided layout
(Inherited from Target.)
Protected methodRenderLogEventT(LayoutT, LogEventInfo, T)
Renders the logevent into a result-value by using the provided layout
(Inherited from Target.)
Protected methodResolveServiceT
Resolve from DI ServiceRepository
(Inherited from Target.)
Public methodToString
Returns a string that represents the current object.
(Inherited from WrapperTargetBase.)
Protected methodWrite(AsyncLogEventInfo)
Forwards the call to the WrappedTarget.Write() and calls Flush(AsyncContinuation) on it if LogEvent satisfies the flush condition or condition is null.
(Overrides TargetWrite(AsyncLogEventInfo).)
Protected methodWrite(IListAsyncLogEventInfo)
Writes an array of logging events to the log target. By default it iterates on all events and passes them to "Write" method. Inheriting classes can use this method to optimize batch writes.
(Inherited from Target.)
Protected methodWrite(LogEventInfo)
Writes logging event to the log target. Must be overridden in inheriting classes.
(Inherited from WrapperTargetBase.)
Public methodWriteAsyncLogEvent
Writes the log to the target.
(Inherited from Target.)
Public methodWriteAsyncLogEvents(AsyncLogEventInfo)
Writes the array of log events.
(Inherited from Target.)
Public methodWriteAsyncLogEvents(IListAsyncLogEventInfo)
Writes the array of log events.
(Inherited from Target.)
Protected methodWriteAsyncThreadSafe(AsyncLogEventInfo)
Writes a log event to the log target, in a thread safe manner. Any override of this method has to provide their own synchronization mechanism. !WARNING! Custom targets should only override this method if able to provide their own synchronization mechanism. Layout-objects are not guaranteed to be thread-safe, so using them without a SyncRoot-object can be dangerous.
(Inherited from Target.)
Protected methodWriteAsyncThreadSafe(IListAsyncLogEventInfo)
Writes an array of logging events to the log target, in a thread safe manner. Any override of this method has to provide their own synchronization mechanism. !WARNING! Custom targets should only override this method if able to provide their own synchronization mechanism. Layout-objects are not guaranteed to be thread-safe, so using them without a SyncRoot-object can be dangerous.
(Inherited from Target.)
Protected methodWriteFailedNotInitialized
LogEvent is written to target, but target failed to successfully initialize
(Inherited from Target.)
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Remarks
Examples

To set up the target in the configuration file, use the following syntax:

XML
 1<?xml version="1.0" ?>
 2<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd"
 3      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 4    <targets>
 5        <target name="file" xsi:type="AutoFlushWrapper" condition="level >= LogLevel.Debug">
 6            <target xsi:type="File" fileName="${basedir}/file.txt" />
 7        </target>
 8    </targets>
 9
10    <rules>
11        <logger name="*" minlevel="Debug" writeTo="file" />
12    </rules>
13</nlog>

To set up the log target programmatically use code like this:

C#
 1using System;
 2
 3using NLog;
 4using NLog.Targets;
 5using NLog.Targets.Wrappers;
 6using System.Diagnostics;
 7
 8class Example
 9{
10    static void Main(string[] args)
11    {
12        FileTarget wrappedTarget = new FileTarget();
13        wrappedTarget.FileName = "${basedir}/file.txt";
14
15        AutoFlushTargetWrapper target = new AutoFlushTargetWrapper();
16        target.WrappedTarget = wrappedTarget;
17        target.Condition = "level >= LogLevel.Debug";
18        NLog.Config.SimpleConfigurator.ConfigureForTargetLogging(target, LogLevel.Debug);
19
20        Logger logger = LogManager.GetLogger("Example");
21        logger.Debug("log message");
22    }
23}
See Also