vb.net qr code open source Part II Designing Types in VS .NET

Drawing QR Code 2d barcode in VS .NET Part II Designing Types

Part II Designing Types
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arguments . This class acts as a factory for creating Tuple objects, and it exists simply to simplify your code . Here is a rewrite of the MinMax method shown earlier using the static Tuple class:
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// Returns minimum in Item1 & maximum in Item2 private static Tuple<Int32, Int32>MinMax(Int32 a, Int32 b) { return Tuple.Create(Math.Min(a, b), Math.Max(a, b)); // Simpler syntax }
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If you want to create a Tuple with more than eight elements in it, then you would pass another Tuple for the Rest parameter as follows:
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var t = Tuple.Create(0, 1, 2, 3, 4, 5, 6, Tuple.Create(7, 8)); Console.WriteLine("{0}, {1}, {2}, {3}, {4}, {5}, {6}, {7}, {8}", t.Item1, t.Item2, t.Item3, t.Item4, t.Item5, t.Item6, t.Item7, t.Rest.Item1.Item1, t.Rest.Item1.Item2);
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Note In addition to anonymous types and the Tuple types, you might want to take a look
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at the System.Dynamic.ExpandoObject class (defined in the System .Core .dll assembly) . When you use this class with C# s dynamic type (discussed in 5, Primitive, Reference, and Value Types ), you have another way of grouping a set of properties (key/value pairs) together . The result is not compile-time type-safe, but the syntax looks nice (although you get no IntelliSense support), and you can pass ExpandoObject objects between C# and dynamic languages like Python . Here s some sample code that uses an ExpandoObject:
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dynamic e = new System.Dynamic.ExpandoObject(); e.x = 6; // Add an Int32 'x' property whose value is 6 e.y = "Jeff"; // Add a String 'y' property whose value is "Jeff" e.z = null; // Add an Object 'z' property whose value is null // See all the properties and their values: foreach (var v in (IDictionary<String, Object>)e) Console.WriteLine("Key={0}, V={1}", v.Key, v.Value);
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// Remove the 'x' property and its value var d = (IDictionary<String, Object>)e; d.Remove("x");
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Parameterful Properties
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In the previous section, the get accessor methods for the properties accepted no parameters . For this reason, I called these properties parameterless properties . These properties are easy to understand because they have the feel of accessing a field . In addition to these field-like properties, programming languages also support what I call parameterful properties, whose get accessor methods accept one or more parameters and whose set accessor methods accept two or more parameters . Different programming languages expose parameterful properties in different ways . Also, languages use different terms to refer to parameterful properties: C# calls them indexers and Visual Basic calls them default properties . In this section, I ll focus on how C# exposes its indexers by using parameterful properties .
10 Properties
In C#, parameterful properties (indexers) are exposed using an array-like syntax . In other words, you can think of an indexer as a way for the C# developer to overload the [] operator . Here s an example of a BitArray class that allows array-like syntax to index into the set of bits maintained by an instance of the class:
using System; public sealed class BitArray { // Private array of bytes that hold the bits private Byte[] m_byteArray; private Int32 m_numBits; // Constructor that allocates the byte array and sets all bits to 0 public BitArray(Int32 numBits) { // Validate arguments first. if (numBits <= 0) throw new ArgumentOutOfRangeException("numBits must be > 0"); // Save the number of bits. m_numBits = numBits; // Allocate the bytes for the bit array. m_byteArray = new Byte[(numBits + 7) / 8]; } // This is the indexer (parameterful property). public Boolean this[Int32 bitPos] { // This is the indexer's get accessor method. get { // Validate arguments first if ((bitPos < 0) || (bitPos >= m_numBits)) throw new ArgumentOutOfRangeException("bitPos"); // Return the state of the indexed bit. return (m_byteArray[bitPos / 8] & (1 << (bitPos % 8))) != 0; } // This is the indexer's set accessor method. set { if ((bitPos < 0) || (bitPos >= m_numBits)) throw new ArgumentOutOfRangeException("bitPos", bitPos.ToString()); if (value) { // Turn the indexed bit on. m_byteArray[bitPos / 8] = (Byte) (m_byteArray[bitPos / 8] | (1 << (bitPos % 8))); } else { // Turn the indexed bit off. m_byteArray[bitPos / 8] = (Byte) (m_byteArray[bitPos / 8] & ~(1 << (bitPos % 8))); } } } }
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