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To demonstrate the features of the Logging block, we provide a sample application that you can download and run on your own computer. You can run the executable directly from the bin\Debug folder, or you can open the solution named Logging in Microsoft Visual Studio to see the code and run it under Visual Studio. The application includes a preconfigured database for storing log entries, as well as scripts you can use to create the Logging database within a different database server if you prefer. You do not need to run the scripts if you have Microsoft SQL Server Express installed locally. If you want to specify a different database for logging, edit the script named CreateLoggingDb.cmd to specify the location of the database and execute it. After you do that, you must change the connection string named ExampleDatabase to point to your new database. In addition, depending on the version of the operating system you are using, you may need to execute the application under the context of an account with administrative privileges. If you are running the sample from within Visual Studio, start Visual Studio by right-clicking the entry in your Start menu and selecting Run as administrator. One other point to note about the sample application is that it creates a folder named Temp in the root of your C: drive if one does not already exist, and writes the text log files there so that you can easily find and view them. The first of the examples, Simple logging with the Write method of a LogWriter, demonstrates how you can use a LogWriter directly to create log entries. The first stage is to obtain a LogWriter, and the example uses the simplest approach the GetInstance method of the current Enterprise Library container. See the following code.
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// Resolve the default LogWriter object from the container. LogWriter defaultWriter = EnterpriseLibraryContainer.Current.GetInstance<LogWriter>();
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creating and writing log entries with a logwriter
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Now you can call the Write method and pass in any parameter values you require. There are many overloads of the Write method. They allow you to specify the message text, the category, the priority (a numeric value), the event ID, the severity (a value from the TraceEventType enumeration), and a title for the event. There is also an overload that allows you to add custom values to the log entry by populating a Dictionary with name and value pairs (you will see this used in a later example). Our example code uses several of these overloads. We ve removed some of the Console.WriteLine statements from the code listed here to make it easier to see what it actually does.
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// Check if logging is enabled before creating log entries. if (defaultWriter.IsLoggingEnabled()) { defaultWriter.Write("Log entry created using the simplest overload."); defaultWriter.Write("Log entry with a single category.", "General");
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defaultWriter.Write("Log entry with a category, priority, and event ID.", "General", 6, 9001); defaultWriter.Write("Log entry with a category, priority, event ID, " + "and severity.", "General", 5, 9002, TraceEventType.Warning); defaultWriter.Write("Log entry with a category, priority, event ID, " + "severity, and title.", "General", 8, 9003, TraceEventType.Warning, "Logging Block Examples"); } else { Console.WriteLine("Logging is disabled in the configuration."); }
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Notice how the code first checks to see if logging is enabled. There is no point using valuable processor cycles and memory generating log entries if they aren t going anywhere. The Filters section of the Logging block configuration can contain a special filter named the Log Enabled Filter (we have configured one in our example application). This filter has the single property, Enabled, that allows administrators to enable and disable all logging for the block. When it is set to False, the IsLoggingEnabled property of the LogWriter will return false as well. The example produces the following result. All of the events are sent to the General category, which is configured to write events to the Windows Application Event Log (this is the default configuration for the block).
Created a Log Entry using the simplest overload. Created a Log Entry with a single category. Created a Log Entry with a category, priority, and event ID. Created a Log Entry with a category, priority, event ID, and severity. Created a Log Entry with a category, priority, event ID, severity, and title. Open Windows Event Viewer 'Application' Log to see the results.
You can open Windows Event Viewer to see the results. Figure 3 shows the event generated by the last of the Write statements in this example.
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