Updating DataView

[Terry McNamee]

I have a DataTable which i have added data to.

I have a custom method that prints a DataView of the DataTable out on the
screen. The problem I'm having is, i need to call the custom method
whenever the DataTable is changed.

How can I do this? this is not a standard binding problem, since I need to
call a custom method to paint the items on the screen.

view.ListChanged += new ListChangedEventHandler(this.view_Changed);



private void view_Changed(object sender,
System.ComponentModel.ListChangedEventArgs e)

{

this.populateMenu(); //we want to populate the menu again.

}

Many thanks.

 

[Nicholas Paldino [.NET/C# MVP]]

Terry,

When the DataTable is changed, your event handler should call the
Invalidate method on the control you need repainted. Then, that control
should have an event handler for the Paint event, or an override of the
OnPaint method. In that, you will have your code that paints your screen
(this causes your screen to be painted correctly when needed).

Hope this helps.

 

[Terry McNamee]

Hi Nicholas,

How can I determine when the DataTable is changed ?

Basically what i need to do is call the populateMenu method once the
DataTable is changed.

I understand what you're saying about the paint methods, but the
populateMenu method goes through the view and adds each item to my
customised menu.

Thanks.

Terry,

When the DataTable is changed, your event handler should call the
Invalidate method on the control you need repainted. Then, that control
should have an event handler for the Paint event, or an override of the
OnPaint method. In that, you will have your code that paints your screen
(this causes your screen to be painted correctly when needed).

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

I have a DataTable which i have added data to.

I have a custom method that prints a DataView of the DataTable out on the
screen. The problem I'm having is, i need to call the custom method
whenever the DataTable is changed.

How can I do this? this is not a standard binding problem, since I need
to call a custom method to paint the items on the screen.

view.ListChanged += new ListChangedEventHandler(this.view_Changed);



private void view_Changed(object sender,
System.ComponentModel.ListChangedEventArgs e)

{

this.populateMenu(); //we want to populate the menu again.

}

Many thanks.

 

[Terry McNamee]

To give you a better understanding of what I'm doing...

I'm using a ownerdrawnlist control that is used as a menu on the smartphone.
To populate this menu, I iterate through the DataTable by:

foreach (DataRowView row in view)

{

dataMenu.Items.Add(new DataItem(row["Name"].ToString(),
row["File"].ToString()));

}

The trouble I'm experiencing, is when I add change the datatable in any way,
I need to update my ownerdrawnlist control. I'm using a view to sort the
datatable alphabetically, and then I want to iterate through the view
populating my table.

I appreciate your assistance.

Hi Nicholas,

How can I determine when the DataTable is changed ?

Basically what i need to do is call the populateMenu method once the
DataTable is changed.

I understand what you're saying about the paint methods, but the
populateMenu method goes through the view and adds each item to my
customised menu.

Thanks.

Terry,

When the DataTable is changed, your event handler should call the
Invalidate method on the control you need repainted. Then, that control
should have an event handler for the Paint event, or an override of the
OnPaint method. In that, you will have your code that paints your screen
(this causes your screen to be painted correctly when needed).

Hope this helps.


--
- Nicholas Paldino [.NET/C# MVP]
- (e-mail address removed)

I have a DataTable which i have added data to.

I have a custom method that prints a DataView of the DataTable out on
the screen. The problem I'm having is, i need to call the custom method
whenever the DataTable is changed.

How can I do this? this is not a standard binding problem, since I need
to call a custom method to paint the items on the screen.

view.ListChanged += new ListChangedEventHandler(this.view_Changed);



private void view_Changed(object sender,
System.ComponentModel.ListChangedEventArgs e)

{

this.populateMenu(); //we want to populate the menu again.

}

Many thanks.