C#

<br />
interface IFoo<br />
{<br />
	... methods here...<br />
}<br />
<br />
interface IFooFactory<br />
{<br />
	IFoo CreateIFoo(string a, int b);<br />
}<br />
<br />
public class MyFoo : IFoo<br />
{<br />
... methods from IFoo...<br />
public static IFooFactory factory = new MyFooFactory();<br />
<br />
}<br />
<br />
class MyFooFactory : IFooFactory<br />
{<br />
	public IFoo CreateIFoo(string a, int b)<br />
	{<br />
		return new MyFoo(a, b);<br />
	}<br />
}<br />
<br />
then to use it:<br />
IFoo foo = IFoo.factory.CreateIFoo("hello", 1);<br />
<br />

FileStream oFileStream;
oFileStream = new FileStream( this.filename, FileMode.Open, FileAccess.Read, FileShare.Read);

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The constructor is given read/write access to the file, and it is opened sharing Read access (that is, requests to open the file for writing by this or another process will fail until the FileStream object has been closed, but read attempts will succeed). The buffer size is set to the default size of 4096 bytes (4 KB).