visual basic .net barcode generator TESTING AND DEBUGGING in C#.NET

Painting Data Matrix in C#.NET TESTING AND DEBUGGING

CHAPTER 38 TESTING AND DEBUGGING
DataMatrix Creation In C#.NET
Using Barcode drawer for VS .NET Control to generate, create Data Matrix image in .NET framework applications.
www.OnBarcode.com
Data Matrix Reader In C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Using Debug Listeners
EAN / UCC - 13 Creator In C#.NET
Using Barcode encoder for .NET Control to generate, create GTIN - 128 image in .NET framework applications.
www.OnBarcode.com
Generating Barcode In C#.NET
Using Barcode maker for .NET framework Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
The Debug class maintains a list of listener objects that are notified when you call the Assert method (or the other Debug methods that we ll see later). The dialog box appears when you call Assert because this is the behavior of the default listener object. It takes the parameter you passed to the Assert method and uses it in the dialog box. We can access the set of listener objects through the Debug.Listeners property, which returns a TraceListenerCollection, which is a collection of TraceListener objects. This is the base class for objects that want to listen to debug messages. We can remove the default listener and add our own. The simplest way to do this is to use the TextWriterTraceListener class, which will receive messages from the Debug class and write them to a Stream, to a TextWriter, or directly to a file. Listing 38-3 demonstrates removing the default and adding our own listener. Listing 38-3. Replacing the Default Debug Listener using System; using System.Diagnostics; class CalculatorTest { static void Main(string[] args) { // remove the default listener Debug.Listeners.Clear(); // create a new listener TextWriterTraceListener listener = new TextWriterTraceListener(Console.Out); // register our new listener Debug.Listeners.Add(listener); // create a new Calculator object Calculator calc = new Calculator(); // perform a calculation that we know will cause a problem int divisionResult = calc.CalculateDivision(10, 0); // write out the result Console.WriteLine("Division Result: {0}", divisionResult); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } To remove any existing listeners, we call the Clear method on the collection returned from the Debug.Listeners property. The Debug class can have multiple listeners, so care should be taken when calling the Clear method to prevent removing a listener that you wanted to keep. Here is the statement that removes the listeners:
Encoding Matrix 2D Barcode In Visual C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create 2D Barcode image in VS .NET applications.
www.OnBarcode.com
Encode Code128 In Visual C#
Using Barcode maker for VS .NET Control to generate, create USS Code 128 image in Visual Studio .NET applications.
www.OnBarcode.com
Debug.Listeners.Clear();
Linear 1D Barcode Generator In C#
Using Barcode maker for .NET Control to generate, create Linear 1D Barcode image in VS .NET applications.
www.OnBarcode.com
Leitcode Printer In C#.NET
Using Barcode creation for .NET framework Control to generate, create Leitcode image in .NET framework applications.
www.OnBarcode.com
CHAPTER 38 TESTING AND DEBUGGING
Data Matrix 2d Barcode Reader In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Data Matrix 2d Barcode Encoder In C#
Using Barcode printer for Visual Studio .NET Control to generate, create DataMatrix image in VS .NET applications.
www.OnBarcode.com
The TextWriterTraceListener class has three constructor overloads, which are described in Table 38-2. Table 38-2. The Constructors for the TextWriterTraceListener Class
Encoding EAN 128 In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create GS1-128 image in ASP.NET applications.
www.OnBarcode.com
Reading ANSI/AIM Code 128 In Visual Basic .NET
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Constructor
Barcode Recognizer In .NET Framework
Using Barcode Control SDK for ASP.NET Control to generate, create, read, scan barcode image in ASP.NET applications.
www.OnBarcode.com
Encoding EAN128 In Java
Using Barcode generation for Android Control to generate, create USS-128 image in Android applications.
www.OnBarcode.com
TextWriterTraceListener(Stream) TextWriterTraceListener(TextWriter)
EAN / UCC - 13 Scanner In VB.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Scanning QR Code ISO/IEC18004 In VB.NET
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Description
Painting Barcode In Java
Using Barcode drawer for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
Scanning GS1 - 12 In C#.NET
Using Barcode recognizer for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Debug messages are written to the specified Stream object. Debug messages are written to the specific TextWriter object. Debug messages are written to the file whose name is specified.
EAN128 Generator In None
Using Barcode encoder for Excel Control to generate, create GS1-128 image in Microsoft Excel applications.
www.OnBarcode.com
DataMatrix Creator In Objective-C
Using Barcode creator for iPad Control to generate, create ECC200 image in iPad applications.
www.OnBarcode.com
TextWriterTraceListener(string)
In the listing, I have created an instance using the static Console.Out property as the constructor parameter, like this:
TextWriterTraceListener listener = new TextWriterTraceListener(Console.Out);
The Console.Out property returns a Stream object that, if you write to it, sends data to be written to the command window used to start the program. This trick doesn t work with Windows Forms or WPF programs. You should write your debug messages to a file for such programs, either by creating a Stream using the File class or by using the TextWriterTraceListener constructor that takes a file name as a parameter. If I had wanted to write to a file called myFile.txt, I would have used this:
TextWriterTraceListener listener = new TextWriterTraceListener("myFile.txt");
Having created the TextWriterTraceListener, I register it with the Debug class as follows:
Debug.Listeners.Add(listener);
Once I have added my TextWriterTraceListener, messages from the Assert method will be passed to my object, which will in turn be written to the console. If we compile and run the listing, we get the following results: Fail: Second parameter is zero Unhandled Exception: System.DivideByZeroException: Attempted to divide by zero. at Calculator.CalculateDivision(Int32 x, Int32 y) in C:\Listing 03\Listing 03.cs:line 20 at CalculatorTest.Main(String[] args) in C: \Listing 03\Listing 03.cs:line 35 Press any key to continue . . . You can see that the message is written to the console and that this is followed by the exception that is caused by the zero value parameter. Our new listener doesn t stop the execution of the program. There are several overloaded versions of the Assert method, as described in Table 38-3.
Copyright © OnBarcode.com . All rights reserved.