code 39 barcode vb.net Assertions in Visual Basic .NET

Making USS Code 128 in Visual Basic .NET Assertions

Assertions
Code 128 Generator In VB.NET
Using Barcode generator for VS .NET Control to generate, create Code 128B image in .NET applications.
www.OnBarcode.com
Recognize USS Code 128 In Visual Basic .NET
Using Barcode reader for VS .NET Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Assertions are new to Java version 1.4 and have no direct equivalent in C#. However, the .NET class libraries include a superset of the Java assert functionality through the static methods contained in both the System.Diagnostics.Debug and System.Diagnostics.Trace classes. A discussion of the Debug and Trace classes is beyond the scope of this book. Consult the Microsoft .NET documentation for more information.
Making Bar Code In VB.NET
Using Barcode creator for Visual Studio .NET Control to generate, create barcode image in .NET applications.
www.OnBarcode.com
Recognizing Barcode In VB.NET
Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
www.OnBarcode.com
Preprocessor Directives
Code 128C Printer In C#
Using Barcode creator for .NET Control to generate, create Code 128 image in VS .NET applications.
www.OnBarcode.com
Generating Code 128 Code Set A In VS .NET
Using Barcode creation for ASP.NET Control to generate, create Code 128 image in ASP.NET applications.
www.OnBarcode.com
Preprocessor directives are instructions to the C# compiler to perform some action during compilation. There is no equivalent functionality in Java. The term preprocessor directive is misleading because the compilation process does not include a preprocessing step, but the term is a legacy of C/C++ and has remained to avoid confusion. Preprocessor directives are used to
Create Code 128 In .NET
Using Barcode encoder for VS .NET Control to generate, create Code 128 Code Set C image in .NET framework applications.
www.OnBarcode.com
EAN / UCC - 13 Encoder In Visual Basic .NET
Using Barcode generation for VS .NET Control to generate, create EAN-13 image in .NET applications.
www.OnBarcode.com
Conditionally include and exclude sections of code during compilation. Force the compiler to issue warnings and errors. Group related sections of source code. Alter the line number and file-name references displayed by the compiler for errors and warnings.
Encoding Bar Code In VB.NET
Using Barcode encoder for VS .NET Control to generate, create bar code image in .NET applications.
www.OnBarcode.com
Drawing UCC.EAN - 128 In Visual Basic .NET
Using Barcode printer for .NET framework Control to generate, create UCC - 12 image in VS .NET applications.
www.OnBarcode.com
Preprocessor directives are preceded by the # symbol and must be the only command on a line. They are not terminated with semicolons.
Print Data Matrix 2d Barcode In VB.NET
Using Barcode generator for .NET framework Control to generate, create DataMatrix image in Visual Studio .NET applications.
www.OnBarcode.com
GTIN - 14 Creator In VB.NET
Using Barcode drawer for .NET framework Control to generate, create EAN / UCC - 14 image in .NET framework applications.
www.OnBarcode.com
#define and #undef
DataMatrix Creator In Objective-C
Using Barcode generation for iPhone Control to generate, create Data Matrix 2d barcode image in iPhone applications.
www.OnBarcode.com
Data Matrix 2d Barcode Drawer In Java
Using Barcode encoder for Android Control to generate, create DataMatrix image in Android applications.
www.OnBarcode.com
The #define and #undef directives are used to define and undefine conditional compilation symbols. The #if directive, described in the next section, uses these symbols to control conditional compilation. The following example demonstrates the use of the #define and #undef directives:
Printing UPCA In None
Using Barcode creator for Software Control to generate, create UPC Code image in Software applications.
www.OnBarcode.com
Paint 1D Barcode In VS .NET
Using Barcode maker for VS .NET Control to generate, create 1D Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
6. Advanced Language Features #define release #define win2000 #undef release
Reading Bar Code In C#
Using Barcode recognizer for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Generate EAN 128 In Objective-C
Using Barcode encoder for iPad Control to generate, create EAN 128 image in iPad applications.
www.OnBarcode.com
This example defines the symbols release and win2000. It then undefines release. Only the win2000 symbol is defined at the end of the code fragment. Unless explicitly defined, a symbol is undefined. Once a symbol is defined, it remains defined until it is explicitly undefined or the end of the file is reached. Any preprocessor definition, either a #define or an #undef, must be placed before any code, including a using directive, or else a compiler error will occur. Symbols can also be defined using the /d switch during compilation. Compiler options are discussed in 3, "Creating Assemblies."
Code 39 Extended Creation In Java
Using Barcode maker for Android Control to generate, create USS Code 39 image in Android applications.
www.OnBarcode.com
Recognize PDF-417 2d Barcode In Visual Studio .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
#if, #elif, #else, and #endif
The #if, #elif, #else, and, #endif directives provide conditional compilation based on the definition of symbols as described in the preceding section. The structure and behavior of the #if directive are the same as those of a normal if conditional statement in C# and Java except that the #if directive is terminated with an #endif directive. The compiler evaluates each #if and #elif clause until it finds one that evaluates to true. It then evaluates the enclosed code for possible inclusion in compilation. If no #if or #elif clause evaluates as true and there is an #else clause, the enclosed code will be evaluated. The following example determines the content of the string welcomeString during compilation based on which preprocessor symbol is defined:
string welcomeString = null; #if win2000 //compiling for Windows 2000 platform welcomeString = "Welcome to Windows 2000"; #elif win98 //compiling for Windows 98 platform welcomeString = "Welcome to Windows 98"; #elif win95 //compiling for Windows 95 platform welcomeString = "Welcome to Windows 95"; #else //compiling for all other platforms welcomeString = "Welcome to Windows"; #endif
The test condition supports logical operators and brackets to enable complex conditions to be represented. The supported logical operators available are described in Table 6-3.
Table 6-3. Supported Logical Operators for #if Clause Conditionals
Operator Example Comment == #if win2000 == Equality. Expression will evaluate to true if the win2000 symbol has been defined. true != #if win2000 != Inequality. Expression will evaluate to true if the win2000 symbol has not been defined. true && #if win2000 && Logical AND. Expression will evaluate to true only if both the win2000 AND release symbols have been defined. release || #if win2000 || Logical OR. Expression will evaluate to true if either the win2000 OR release symbol has been defined. release
Copyright © OnBarcode.com . All rights reserved.