How to delete Dynamic created buttons..

Question

1.00/5 (2 votes)

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I knw how to add dynamic buttons to window after a click event on predefined button say "show dynamic btns"

C#

for(int i=0;i<4;i++)                     
{Button bz= new Button();
                         bz.Height = 50;
                         bz.Width = 50;
                         Grid gg=new Grid(); // dynamic grid that add bz
                         gg.Children.Add(bz);
                         ThumGrid.Children.Add(gg);//predefined Grid
}

this will create 4 dynamic grid and buttons. now i want to remove all of them eg. bz and gg..pls tell me how can i do that?..

Posted 5-Jun-12 8:10am

mane0806

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3 solutions

Solution 5

Nearly everything that has Add, also has Remove. What to make sure? Please see:

http://msdn.microsoft.com/en-us/library/system.windows.controls.grid.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.controls.panel.children.aspx[^],
http://msdn.microsoft.com/en-us/library/system.windows.controls.uielementcollection.aspx[^].

Now, what's wrong with your ability to read the documentation? Perhaps you need one more link:
Microsoft Q209354.

—SA

Posted 5-Jun-12 12:01pm

Sergey Alexandrovich Kryukov

Updated 5-Jun-12 12:03pm

v3

Comments

codeBegin 6-Jun-12 7:06am

my 5

Sergey Alexandrovich Kryukov 6-Jun-12 11:30am

Thank you,
--SA

Maciej Los 6-Jun-12 18:18pm

Good answer, my 5!

Sergey Alexandrovich Kryukov 6-Jun-12 18:25pm

Thank you, Maciej.
--SA

Solution 4

You need to keep references to the Grids until you want to delete them. (The Grids keep the references to the Buttons.)

For your example, create a private field in the window class:

C#

private List<Grid> DynamicGrids = new List<Grid>();

Then add:

C#

DynamicGrids.Add(gg);

to the for loop that creates the Grids and Buttons.
Then when you want to remove them:

C#

foreach (Grid g in DynamicGrids)
{
  ThumGrid.Children.Remove(g);
}

This assumes that ThumGrid contains other elements that you don't want to remove, otherwise it is simply:

C#

ThumGrid.Children.Clear();

Be careful not to Remove elements from ThumGrid.Children while iterating over that collection with an IEnumerator (e.g., foreach) or else you will throw an exception: System.InvalidOperationException.

Posted 5-Jun-12 10:18am

Matt T Heffron

Comments

codeBegin 6-Jun-12 7:06am

my 5

Matt T Heffron 6-Jun-12 13:03pm

Thank you.
(I wonder why the two votes of 1?)

Maciej Los 6-Jun-12 18:17pm

(I wonder why the two votes of 1?) - Sometimes it happens ;(
My 5!

Matt T Heffron 6-Jun-12 19:09pm

Thanks!

mane0806 6-Jun-12 22:34pm

i had left some Imp points..but now i got it..thankx..

Matt T Heffron 8-Jun-12 12:22pm

Will you please Accept the useful answer(s)?
http://www.codeproject.com/Articles/64628/Code-Project-Quick-Answers-FAQ#alternates
Thanks.

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Clifford Nelson · Accepted Answer · 2012-06-05T09:47:00

Note that the children of the grid, is just another collection. The Add and Remove methods work just like any collection. Interesting thing is that the Remove needs a UIElement, so if you go through the collection with a foreach, you get an object, which needs to be converted to a UIElement in order to remove. The Clear method is obviously your best choise, but you can do a selective remove using the Remove method