c# generate barcode from string NOTE .NET 2.0 in C#.NET

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NOTE .NET 2.0
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The Nullable type is new in .NET 2.0.
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Lesson 1: Using Value Types
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Declaring a variable as nullable enables the HasValue and Value members. Use HasValue to detect whether or not a value has been set:
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' VB If b.HasValue Then Console.WriteLine("b is {0}.", b.Value) _ Else Console.WriteLine("b is not set.") // C# if (b.HasValue)Console.WriteLine("b is {0}.", b.Value); else Console.WriteLine("b is not set.");
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How to Create User-Defined Types
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User-defined types are also called structures or simply structs, after the language keyword used to create them. As with other value types, instances of user-defined types are stored on the stack and they contain their data directly. In most other ways, structures behave nearly identical to classes. Structures are a composite of other types that make it easier to work with related data. The simplest example of this is System.Drawing.Point, which contains X and Y integer properties that define the horizontal and vertical coordinates of a point. The Point structure simplifies working with coordinates by providing the constructor and members demonstrated here:
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' VB - Requires reference to System.Drawing ' Create point Dim p As New System.Drawing.Point(20, 30) ' Move point diagonally p.Offset(-1, -1) Console.WriteLine("Point X {0}, Y {1}", p.X, p.Y) // C# - Requires reference to System.Drawing // Create point System.Drawing.Point p = new System.Drawing.Point(20, 30); // Move point diagonally p.Offset(-1, -1); Console.WriteLine("Point X {0}, Y {1}", p.X, p.Y);
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You define your own structures by using the Structure keyword in Visual Basic or the struct keyword in C#. For example, the following code creates a type that cycles through a set of integers between minimum and maximum values set by the constructor:
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' VB Structure Cycle ' Private fields Dim _val, _min, _max As Integer
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1
Framework Fundamentals
' Constructor Public Sub New(ByVal min As Integer, ByVal max As Integer) _val = min : _min = min : _max = max End Sub ' Public members Public Property Value() As Integer Get Return _val End Get Set(ByVal value As Integer) ' Ensure new setting is between _min and _max. If value > _max Then _val = _min _ Else If value < _min Then _val = _max _ Else _val = value End Set End Property Public Overrides Function ToString() As String Return Value.ToString End Function Public Function ToInteger() As Integer Return Value End Function ' Operators (new in 2.0) Public Shared Operator +(ByVal arg1 As Cycle, _ ByVal arg2 As Integer) As Cycle arg1.Value += arg2 Return arg1 End Operator Public Shared Operator -(ByVal arg1 As Cycle, _ ByVal arg2 As Integer) As Cycle arg1.Value -= arg2 Return arg1 End Operator End Structure // C# struct Cycle { // Private fields int _val, _min, _max; // Constructor public Cycle(int min, int max) { _val = min; _min = min; _max = max; }
Lesson 1: Using Value Types
public int Value { get { return _val; } set { if (value > _max) _val = _min; else { if (value < _min) _val = _max; else _val = value; } } } public override string ToString() { return Value.ToString(); } public int ToInteger() { return Value; } // Operators (new in .NET 2.0) public static Cycle operator +(Cycle arg1, int arg2) { arg1.Value += arg2; return arg1; } public static Cycle operator -(Cycle arg1, int arg2) { arg1.Value -= arg2; return arg1; } }
NOTE .NET 2.0
The Operator keyword is new in .NET 2.0.
You can use this structure to represent items that repeat over a fixed range, such as degrees of rotation or quarters of a football game, as shown here:
' VB Dim degrees As New Cycle(0, 359), quarters As New Cycle(1, 4) For i As Integer = 0 To 8
1
Framework Fundamentals
degrees += 90 : quarters += 1 Console.WriteLine("degrees = {0}, quarters = {1}", degrees, quarters) Next // C# Cycle degrees = new Cycle(0, 359); Cycle quarters = new Cycle(1, 4); for (int i = 0; i <= 8; i++) { degrees += 90; quarters += 1; Console.WriteLine("degrees = {0}, quarters = {1}", degrees, quarters); }
The Cycle sample can be easily converted to and from a value type to a reference type by changing the Structure/struct keywords to Class. If you make that change, instances of the Cycle class would be allocated on the managed heap rather than as 12 bytes on the stack (4 bytes for each private integer field) and assignment between two variables results in both variables pointing to the same instance. While the functionality is similar, structures are usually more efficient than classes. You should define a structure, rather than a class, if the type will perform better as a value type than a reference type. Specifically, structure types should meet all of these criteria:
Logically represents a single value Has an instance size less than 16 bytes Will not be changed after creation Will not be cast to a reference type
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