Raising Event not working


T

Tina

I am trying to raise a custom event in a user control passing custom data
arguments. I have done this many times in VB but this is my first time in
C#.

The code below passes the proper arguments in the
this.OnRaiseCFEvent(myArgs); code but in the OnRaiseCFEvent method
RaiseCFEVent is always null so this.RaiseCFEvent(this,e); never executes.

Can anyone tell my why RaiseCFEvent is always null?
thanks,
T

public partial class EditGrid : System.Web.UI.UserControl
{
public delegate void ChangedFieldsEventHandler(object sender,
ChangedFieldsEventArgs e);
public event ChangedFieldsEventHandler RaiseCFEvent;
protected virtual void OnRaiseCFEvent(ChangedFieldsEventArgs e)
{
if (this.RaiseCFEvent != null)
{
this.RaiseCFEvent(this,e);
}
}
..
..
..
ChangedFieldsEventArgs myArgs = new
ChangedFieldsEventArgs(gvRow.RowIndex, i, string1, string2);
this.OnRaiseCFEvent(myArgs);

..
..
..

}

public class ChangedFieldsEventArgs : EventArgs
{
public readonly int row, col;
public readonly string newVal, oldVal;
public ChangedFieldsEventArgs(int row, int col, string newVal, string
oldVal)
{
this.row = row;
this.col = col;
this.newVal = newVal;
this.oldVal = oldVal;
}
}
 
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B

Bruce Wood

Tina said:
I am trying to raise a custom event in a user control passing custom data
arguments. I have done this many times in VB but this is my first time in
C#.

The code below passes the proper arguments in the
this.OnRaiseCFEvent(myArgs); code but in the OnRaiseCFEvent method
RaiseCFEVent is always null so this.RaiseCFEvent(this,e); never executes.

Can anyone tell my why RaiseCFEvent is always null?
thanks,
T

public partial class EditGrid : System.Web.UI.UserControl
{
public delegate void ChangedFieldsEventHandler(object sender,
ChangedFieldsEventArgs e);
public event ChangedFieldsEventHandler RaiseCFEvent;
protected virtual void OnRaiseCFEvent(ChangedFieldsEventArgs e)
{
if (this.RaiseCFEvent != null)
{
this.RaiseCFEvent(this,e);
}
}
.
.
.
ChangedFieldsEventArgs myArgs = new
ChangedFieldsEventArgs(gvRow.RowIndex, i, string1, string2);
this.OnRaiseCFEvent(myArgs);

.
.
.

}

public class ChangedFieldsEventArgs : EventArgs
{
public readonly int row, col;
public readonly string newVal, oldVal;
public ChangedFieldsEventArgs(int row, int col, string newVal, string
oldVal)
{
this.row = row;
this.col = col;
this.newVal = newVal;
this.oldVal = oldVal;
}
}

I don't see you subscribing to the event anywhere. In the client you
need to say something like:

myEditGrid.RaiseCFEvent += new
ChangedFieldsEventHandler(myEditGrid_RaiseCFEvent);
 
G

Greg Cadmes

Tina,

In addition to what Bruce wrote, you'll need to raise the event using
this:
RaiseCFEvent(myArgs);

instead of

this.OnRaiseCFEvent(myArgs);

kind regards,
Greg
 
B

Bruce Wood

Maybe I'm overtired, but it appears to me that this won't be a problem,
because OnRaiseCFEvent in turn calls RaiseCFEvent.
 
M

Marc Gravell

It sounds just like you expect C# to auto wire-up (like VB); you just
need to subscribe to the event with

instance.RaiseCFEvent += {handler method};

Marc
 
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