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10
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Instrumentation
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handled. The XmlTextWriterListener allows Debug and Trace output to be written with detailed information stored in predefined Xml attributes. The Assert method of both the Debug and Trace classes forces an examination of a condition, and based on the evaluation, it will let the application continue to run or break into the debugger. The Break method of the Debugger class causes an application s execution to stop at a specific breakpoint.
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The Start method of the Process class allows applications to be started programmatically. The GetProcesses method of the Process class returns information about all running processes on a machine. If information about a specific process is needed (as opposed to general information about all processes), the GetProcessByName or GetProcessById methods should be used. To pass values into the constructor of the Main method, command-line arguments can be specified. The StackTrace object provides detailed information about the state of execution for a given application. StackFrame objects make up the StackTrace object. However, they are intended to support the .NET Framework and should not be used directly. Because String objects are reference types, they pose a potential security vulnerability when used to store passwords. In the current version of the .NET Framework, the SecureString class is provided to manage sensitive data. PerformanceCounter objects are mechanisms that allow specific measurement of an application s resource utilization.
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Lesson Review
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You can use the following questions to test your knowledge of the information in Lesson 3, Monitoring Performance. The questions are also available on the companion CD if you prefer to review them in electronic form.
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NOTE Answers
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
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1. Which method will start an instance of Internet Explorer and specify the URL http://www.microsoft.com for it to navigate to A. Process.Start( iexplore.exe ); B. Process.Start( InternetExplorer, http://www.microsoft.com );
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Lesson 3: Monitoring Performance
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C. Process.Start( iexplore.exe , http://www.microsoft.com ); D. Process.Run( iexplore.exe , http://www.microsoft.com ); 2. Assume that the following code was just run. Which answer illustrates how to specifically output the current StackTrace to the console window
' VB Try Dim x as Int32 = 1 x = x - 1 Dim i as Int32 = 10 / x Catch Problem as DivideByZeroException 'This is the code to fill in End Try // C# try { Int32 x = 1; x--; Int32 i = 10 / x; } catch (DivideByZeroException Problem) { //This is the code to fill in }
A. Debug.Assert(Problem.Message); B. Debug.Assert(false, Problem.ToString(); C. Console.WriteLine(Problem.ToString()); D. Console.WriteLine(Problem.StackTrace.ToString()); 3. Which method is appropriate to specify a password when starting a process A. Use a String variable that contains the password. B. Use an Array of type Char C. Use an Array of type String coupled with an Integer reference to the password s index in the array. D. Use a SecureString object.
10
Instrumentation
Lesson 4: Detecting Management Events
The System.Management namespace provides a comprehensive set of tools to monitor and manage the system, devices, and applications via the Windows Management Instrumentation (WMI) technology.
After this lesson, you will be able to:
Enumerate management objects. Create queues. Respond to events.
Estimated lesson time: 20 minutes
Enumerating Management Objects
At the core of the System.Management namespace is the DirectoryObjectSearcher object, which can programmatically access resources through WMI. This mechanism is extremely easy to use because the syntax mimics that of Structured Query Language (SQL), which most developers are already familiar with. To execute a query using the DirectoryObjectSearcher, the following steps need to be performed: 1. Declare an instance of the ConnectionOptions class, and set the UserName and Password properties. 2. Declare an instance of the DirectoryObjectSearcher class. 3. Declare a ManagementScope object, and set the PathName and ConnectionOptions properties. 4. Create an ObjectQuery object, and specify a query to run. 5. Create a ManagementObjectCollection, and set it to the return value from the DirectoryObjectSearcher s Get method.
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