ComponentCollection Constructor (IComponent[])

 

Initializes a new instance of the ComponentCollection class using the specified array of components.

Namespace:   System.ComponentModel
Assembly:  System (in System.dll)

public ComponentCollection(
	IComponent[] components
)

Parameters

components
Type: System.ComponentModel.IComponent[]

An array of IComponent objects to initialize the collection with.

This method adds each IComponent in the specified IComponent array to the collection.

The following code example demonstrates how to create a ComponentCollection from an array of BookComponent objects.

//This code segment implements the IContainer interface.  The code segment 
//containing the implementation of ISite and IComponent can be found in the documentation
//for those interfaces.

//Implement the LibraryContainer using the IContainer interface.

class LibraryContainer : IContainer
{
	private ArrayList m_bookList;

	public LibraryContainer()
	{
		m_bookList = new ArrayList();
	}

	public virtual void Add(IComponent book)
	{
		//The book will be added without creation of the ISite object.
		m_bookList.Add(book);
	}

	public virtual void Add(IComponent book, string ISNDNNum)
	{
		for(int i =0; i < m_bookList.Count; ++i)
		{
			IComponent curObj = (IComponent)m_bookList[i];
			if(curObj.Site != null)
			{
				if(curObj.Site.Name.Equals(ISNDNNum))
					throw new SystemException("The ISBN number already exists in the container"); 
			}
		}

		ISBNSite data = new ISBNSite(this, book);
		data.Name = ISNDNNum;
		book.Site = data;
		m_bookList.Add(book);
	}

	public virtual void Remove(IComponent book)
	{
		for(int i =0; i < m_bookList.Count; ++i)
		{				
			if(book.Equals(m_bookList[i]))
			{
				m_bookList.RemoveAt(i);
					break;
			}
		}
	}

	public ComponentCollection Components
	{
		get
		{
			IComponent[] datalist = new BookComponent[m_bookList.Count];
			m_bookList.CopyTo(datalist);
			return new ComponentCollection(datalist);
		}
	}

	public virtual void Dispose()
	{	
		for(int i =0; i < m_bookList.Count; ++i)
		{
			IComponent curObj = (IComponent)m_bookList[i];
			curObj.Dispose();
		}

		m_bookList.Clear();
	}

	static void Main(string[] args)
	{
		LibraryContainer cntrExmpl = new LibraryContainer();

		try
		{
			BookComponent book1 = new BookComponent("Wizard's First Rule", "Terry Gooodkind");
			cntrExmpl.Add(book1, "0812548051");
			BookComponent book2 = new BookComponent("Stone of Tears", "Terry Gooodkind");
			cntrExmpl.Add(book2, "0812548094");
			BookComponent book3 = new BookComponent("Blood of the Fold", "Terry Gooodkind");
			cntrExmpl.Add(book3, "0812551478");
			BookComponent book4 = new BookComponent("The Soul of the Fire", "Terry Gooodkind");
			//This will generate exception because the ISBN already exists in the container.
			cntrExmpl.Add(book4, "0812551478");
		}
		catch(SystemException e)
		{
			Console.WriteLine("Error description: " + e.Message);
		}

		ComponentCollection datalist =cntrExmpl.Components;
		IEnumerator denum = datalist.GetEnumerator();

		while(denum.MoveNext())
		{
			BookComponent cmp = (BookComponent)denum.Current;
			Console.WriteLine("Book Title: " + cmp.Title);
			Console.WriteLine("Book Author: " + cmp.Author);
			Console.WriteLine("Book ISBN: " + cmp.Site.Name);
		}
	}
}

.NET Framework
Available since 1.1
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