delegate andevent mechanisms

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Can you please give me an example showing best practices using the delegate
and event mechanisms built into the .Net framework so that changes to a
property would notify any interested listeners? Thanks.

[Peter Duniho]

Re: delegate andevent mechanisms

On Wed, 19 Nov 2008 23:07:00 -0800, Gerhard <Gerhard@commun ity.nospam>
wrote:

Can you please give me an example showing best practices using the
delegate
and event mechanisms built into the .Net framework so that changes to a
property would notify any interested listeners? Thanks.

A couple of quick MSDN searches turned up these articles:

http://msdn.microsoft.com/en-us/library/w369ty8x.aspx

http://msdn.microsoft.com/en-us/library/aa645739(VS.71).aspx

http://msdn.microsoft.com/en-us/library/3b8tbfec.aspx

http://msdn.microsoft.com/en-us/library/bzwdh01d.aspx

[Zhi-Xin Ye [MSFT]]

RE: delegate andevent mechanisms

Hello Gerhard,

Thank you for using Microsoft Managed Newsgroup Service, I'm Zhi-Xin Ye,
it's my pleasure to work with you on this issue.

To notify clients that a property value has changed, you can implement the
INotifyProperty Changed interface on your classes.

For example,

[Zhi-Xin Ye [MSFT]]

RE: delegate andevent mechanisms

Hello Gerhard,

Thank you for using Microsoft Managed Newsgroup Service, I'm Zhi-Xin Ye,
it's my pleasure to work with you on this issue.

To notify clients that a property value has changed, you can implement the
INotifyProperty Changed interface on your classes.

For example,


============== Code Sample =============== ==

class Customer : INotifyProperty Changed
{
private int id;
private string name;

public Customer(int id, string name)
{
this.id = id;
this.name = name;
}

public int ID
{
get { return id; }
set
{
this.id = value;
NotifyPropertyC hanged("ID");
}
}

public string Name
{
get { return name; }
set
{
this.name = value;
NotifyPropertyC hanged("Name");
}
}

#region INotifyProperty Changed Members

public event PropertyChanged EventHandler PropertyChanged ;

private void NotifyPropertyC hanged(String info)
{
if (PropertyChange d != null)
{
PropertyChanged (this, new PropertyChanged EventArgs(info) );
}
}

#endregion
}

public partial class Form1: Form
{
public Form1()
{
InitializeCompo nent();

c.PropertyChang ed += new
PropertyChanged EventHandler(c_ PropertyChanged );
}

Customer c = new Customer(1, "aa");

private void button1_Click(o bject sender, EventArgs e)
{
c.Name = "ff";
}

private void button2_Click(o bject sender, EventArgs e)
{
c.ID = 2;
}

void c_PropertyChang ed(object sender, PropertyChanged EventArgs e)
{
MessageBox.Show (e.PropertyName + " Changed!");
}
}

=============== ===============

For more information about the INotifyProperty Changed Interface, you can
refer to this document:

http://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropert

ychanged.aspx

If anything is unclear, please feel free to let me know.

Have a nice day!

Best Regards,
Zhi-Xin Ye
Microsoft Managed Newsgroup Support Team

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