c# generate barcode from string Collections and Generics in C#.NET

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Collections and Generics
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Writing Your Own Collections
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The collection interfaces mentioned in this chapter (for example, IList and ICollection) can be used to implement your own collections. You can start from scratch and write your own collections that implement these interfaces, and the rest of the .NET Framework will recognize your classes as collections. Much of the work required to write your collections is common to many collections. The .NET Framework exposes several base classes to wrap up this common behavior:
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CollectionBase ReadOnlyCollectionBase DictionaryBase
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These base classes can be used as the basis of a collection of your own. The CollectionBase class supports the IList, Ienumerable, and ICollection interfaces. Inheriting from CollectionBase will allow you to have a collection that already supports these interfaces. You would use the CollectionBase class whenever you need a simple collection of items with some specific behavior that you do not find in the built-in collections. Like the CollectionBase class, the ReadOnlyCollectionBase supports the IList, Ienumerable, and ICollection interfaces. The big difference in the ReadOnlyCollectionBase is that it does not support changing the collection from outside the class. This class is ideal when you need your own collection that is read-only to the users of the collection. Unlike the CollectionBase and ReadOnlyCollection base classes, the DictionaryBase implements the IDictionary, IEnumerable, and ICollection interfaces. The DictionaryBase class would be used if you need to implement your own keyed collection. Before .NET 2.0, it would be common to create your own collections using these interfaces in order to create type-safe collections. Now that generics are available, it is preferable to use the generic collections if your only requirement is a typesafe collection.
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Lesson 5: Generic Collections
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Lab: Create and Use a Generic Collection
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In this lab, you create a generic Dictionary to hold country calling codes and the full name of the country. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
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Exercise 1: Create a Generic Collection to Store State Data
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In this exercise, you create a generic Dictionary to hold state abbreviations with their full names. 1. Create a new console application called GenericCollections. 2. In the Main method of the project, create a new instance of the generic Dictionary class, specifying the key to be an integer and the value to be a string. 3. Add items to the collection using country codes for the keys and country names as the values. 4. Try to add strings for the keys of the country codes to make sure that the Dictionary is type safe. If they fail to compile, remove them in code or comment them out. 5. Write out to the console of one of your country codes using the indexer syntax of the Dictionary. 6. Iterate over the collection, and write out the country code and name of the country for each KeyValuePair in the Dictionary. Your code might look something like this:
' VB Class Program Public Overloads Shared Sub Main() Dim countryLookup As New Dictionary(Of Integer, String)() countryLookup(44) = "United Kingdom" countryLookup(33) = "France" countryLookup(31) = "Netherlands" countryLookup(55) = "Brazil" 'countryLookup["64"] = "New Zealand"; Console.WriteLine("The 33 Code is for: {0}", countryLookup(33)) For Each item As KeyValuePair(Of Integer, String) In countryLookup Dim code As Integer = item.Key Dim country As String = item.Value Console.WriteLine("Code {0} = {1}", code, country) Next
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Collections and Generics
Console.Read() End Sub End Class // C# class Program { static void Main(string[] args) { Dictionary<int, String> countryLookup = new Dictionary<int, String>(); countryLookup[44] = "United Kingdom"; countryLookup[33] = "France"; countryLookup[31] = "Netherlands"; countryLookup[55] = "Brazil"; //countryLookup["64"] = "New Zealand"; Console.WriteLine("The 33 Code is for: {0}", countryLookup[33]); foreach (KeyValuePair<int, String> item in countryLookup) { int code = item.Key; string country = item.Value; Console.WriteLine("Code {0} = {1}", code, country); } Console.Read(); } }
7. Build the project, and resolve any errors. Verify that the console application successfully shows all the countries added.
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