print barcode in crystal report vb.net EXCEPTIONS in C#

Generator ECC200 in C# EXCEPTIONS

CHAPTER 14 EXCEPTIONS
Print Data Matrix In Visual C#.NET
Using Barcode generator for VS .NET Control to generate, create ECC200 image in .NET applications.
www.OnBarcode.com
Scanning Data Matrix In Visual C#
Using Barcode reader for .NET framework Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
class Listing 19 { static void Main(string[] args) { // create a new instance of the Calculator class Calculator calc = new Calculator(); try { // make a call to the Calculator.PerformCalculation method // which we know will cause an exception calc.PerformCalculation(100, 10); } catch (Exception ex) { Console.WriteLine("Handled exception of type: {0}", ex.GetType()); Console.WriteLine(ex.ToString()); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Listing 14-19 contains a Calculator class that uses a rectangular multidimensional array to hold a set of results that are computed in the constructor. You can learn more about arrays of all kinds in 13. When the PerformCalculation method is called, the parameter values are used as indices into the results array to return a result. This works fine unless the parameter values are not valid indices for the array, which is what the code in the Main method of the Listing 19 class relies on to cause an exception. Compiling and running the code in the listing produces the following results: Handled exception of type: System.IndexOutOfRangeException System.IndexOutOfRangeException: Index was outside the bounds of the array. at Calculator.PerformCalculation(Int32 num1, Int32 num2) in C:\Listing 19\Listing 19.cs:line 21 at Listing 19.Main(String[] args) in C:\Listing 19\Listing 19.cs:line 36 Press enter to finish The results show a problem. We have thrown an exception that makes no sense to anyone using the Calculator class. They asked for a calculation to be performed, and they got back details of a problem relating to an array. In essence, we have exposed the inner workings of our class and have done so in a way that doesn t help debug the problem.
Print PDF-417 2d Barcode In C#.NET
Using Barcode printer for VS .NET Control to generate, create PDF-417 2d barcode image in VS .NET applications.
www.OnBarcode.com
UPC Code Generator In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create Universal Product Code version A image in .NET applications.
www.OnBarcode.com
Mapping One Exception Type to Another
Matrix Creation In Visual C#
Using Barcode generator for VS .NET Control to generate, create Matrix image in .NET applications.
www.OnBarcode.com
Linear 1D Barcode Printer In C#
Using Barcode printer for .NET Control to generate, create Linear 1D Barcode image in VS .NET applications.
www.OnBarcode.com
We can make exceptions more useful by catching and handling one kind of exception and then throwing another, more meaningful kind in the catch clause. Listing 14-20 contains an example.
UCC - 12 Drawer In Visual C#.NET
Using Barcode generation for .NET framework Control to generate, create EAN 128 image in VS .NET applications.
www.OnBarcode.com
Generate 4-State Customer Barcode In Visual C#
Using Barcode creator for .NET framework Control to generate, create OneCode image in .NET framework applications.
www.OnBarcode.com
CHAPTER 14 EXCEPTIONS
Create DataMatrix In None
Using Barcode creation for Online Control to generate, create DataMatrix image in Online applications.
www.OnBarcode.com
Data Matrix ECC200 Generator In Visual Studio .NET
Using Barcode generation for ASP.NET Control to generate, create DataMatrix image in ASP.NET applications.
www.OnBarcode.com
Listing 14-20. Mapping from One Exception Type to Another using System; class Calculator { private int[,] resultsData; public Calculator() { // initialize and populate the results data resultsData = new int[10, 10]; for (int i = 0; i < 10; i++) { for (int j = 0; j < 10; j++) { resultsData[i, j] = i * j; } } } public int PerformCalculation(int num1, int num2) { try { return resultsData[num1, num2]; } catch (IndexOutOfRangeException) { // throw a more useful exception throw new CalculationParameterRangeException(); } } } class CalculationParameterRangeException : Exception { public CalculationParameterRangeException() : base() { } public CalculationParameterRangeException(string message) : base(message) { } public CalculationParameterRangeException(string message, Exception inner) : base(message, inner) { } } class Listing 20 { static void Main(string[] args) { // create a new instance of the Calculator class Calculator calc = new Calculator(); try { // make a call to the Calculator.PerformCalculation method // which we know will cause an exception calc.PerformCalculation(100, 10); } catch (Exception ex) { Console.WriteLine("Handled exception of type: {0}", ex.GetType()); Console.WriteLine(ex.ToString()); }
Barcode Creation In Visual Studio .NET
Using Barcode printer for ASP.NET Control to generate, create Barcode image in ASP.NET applications.
www.OnBarcode.com
DataMatrix Creation In Java
Using Barcode drawer for Android Control to generate, create Data Matrix 2d barcode image in Android applications.
www.OnBarcode.com
CHAPTER 14 EXCEPTIONS
EAN 13 Reader In VB.NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Printing Barcode In Visual Studio .NET
Using Barcode encoder for .NET Control to generate, create Barcode image in .NET applications.
www.OnBarcode.com
// wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, the PerformCalaculation exception catches IndexOutOfRange exceptions and throws a corresponding CalaculationParameterRangeException. We could add some fields to the custom exception to provide additional information, but just by having a basic custom exception, we have provided some useful information about what went wrong. The name of the custom exception, CalaculationParameterRangeException, makes it clear that the was a problem performing the calculation, and that problem was caused by one or more of the parameters being outside of an expected range. Compiling and running the code in Listing 14-20 produces the following results: Handled exception of type: CalculationParameterRangeException CalculationParameterRangeException: Exception of type 'CalculationParameterRange Exception' was thrown. at Calculator.PerformCalculation(Int32 num1, Int32 num2) in C:\Listing 20\Listing 20.cs:line 21 at Listing 20.Main(String[] args) in C:\ Listing 20\Listing 20.cs:line 43 Press enter to finish
Code 128A Reader In None
Using Barcode reader for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
Generate QR-Code In None
Using Barcode creator for Word Control to generate, create QR Code ISO/IEC18004 image in Word applications.
www.OnBarcode.com
Code 128 Code Set A Recognizer In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
UCC-128 Reader In C#.NET
Using Barcode reader for .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Making Code-128 In None
Using Barcode creator for Microsoft Excel Control to generate, create ANSI/AIM Code 128 image in Office Excel applications.
www.OnBarcode.com
Reading EAN13 In C#
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.