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crystal reports ean 128

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crystal reports gs1 128,

crystal reports gs1 128,
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crystal reports gs1 128,
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crystal reports ean 128,

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crystal reports gs1-128,
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crystal reports gs1 128,
crystal reports gs1 128,

The argument passed to the AttributeUsage attribute specifies that the VersioningAttribute attribute or just Versioning because the trailing Attribute portion of the name can be omitted can be used with any program entity. The argument you pass to the AttributeUsage constructor is a bit-coded value formed by adding one or more elements in this list: Assembly (1), Module (2), Class (4), Struct (8), Enum (16), Constructor (32), Method (64), Property (128), Field (256), Event (512), Interface (1024), Parameter (2048), Delegate (4096), ReturnValue (8192), or All (16,383, the sum of all preceding values). The AttributeUsage attribute supports two additional properties, which can be passed as named arguments in the constructor method. The AllowMultiple property specifies whether the attribute being defined VersioningAttribute in this case can be used multiple times inside angle brackets. The Inherited attribute tells whether a derived class inherits the attribute. The default value for both properties is False.

You need to use a timer variable to keep track of time and a variable for each player to measure the reaction time of that player. Those variables are declared in the following code:

and then click the Go to Next Text Box button that appears. Publisher moves to the second column on page 15.

14:

The Conditional attribute, which I described in 6, is an example of an attribute that supports multiple instances and is also an example of an attribute that s inherited by derived classes. If the Conditional attribute class were implemented in Visual Basic, its source code would be more or less as follows:

<AttributeUsage(AttributeTargets.Method, AllowMultiple:=True, Inherited:=True)> _ Class ConditionalAttribute Inherits System.Attribute Private m_ConditionString As String The constructor method Sub New(ByVal ConditionString As String) Me.ConditionString = ConditionString End Sub The only property of this attribute class Property ConditionString() As String Get Return m_ConditionString End Get Set(ByVal Value As String) m_ConditionString = Value End Set End Property End Class

Whenever you define a custom attribute, you also typically build a piece of code that uses reflection to discover how the developer applied the attribute to code entities in an assembly. For example, let s suppose that a developer has decorated a class with some Versioning attributes:

// Game World int timer; // Gamepad 1 scores int ascore1; int bscore1; int xscore1; int yscore1;

<Versioning( John", 1.01)> _ Class TestClass <Versioning( Robert", 1.01, Tested:=True)> _ Sub MyProc() End Sub <Versioning( Ann", 1.02)> _ Function MyFunction() As Long End Function End Class

The Text In Over ow icon appears. On pages 15 through 17, the text boxes that previously held the continued story are now empty.

The following procedure shows how you can use reflection to list the Versioning attributes for the class and its methods. It uses the GetCustomAttributes method that most reflection types namely, Assembly, Module, Type, ParameterInfo, and all classes that inherit from MemberInfo expose:

Earlier in this chapter I mentioned the System.Reflection.Emit namespace, whose classes let you create an assembly on the fly. The .NET Framework uses these classes internally in a few cases for example, when you pass the RegexOptions.Compiled option to the constructor of the Regex object. (See 11.) Using reflection emit, however, isn t exactly the easiest .NET programming task, and I m glad I ve never had to use it heavily in a real-world application. Nevertheless, at times the ability to create an assembly out of the thin air can be quite tantalizing because it opens up a number of programming techniques that are otherwise impossible. For example, consider building a routine that takes a math expression entered by the end user (as a string), evaluates it, and returns the result. You might use such a routine for a variety of tasks, for example to do function plotting or to find the roots of a higher-degree equation. (See Figure 14-2.) If the reflection emit classes are ruled out, the only other option is to generate the source code of a Visual Basic .NET program, compile it on the fly, and then instantiate one of its classes.

Figure 14-2 The demo application uses on-the-fly compilation to evaluate functions and find the roots of any equation that uses the X variable.