I need my WPF grid control to be dynamically sizable (more or less rows and columns)

Question

i want to have the grid layout dynamic. pretty much the only modification needed is that i need sometimes more and less rows and columns. So the thing is, how do i access the row- & columndefinition in my c# class?

<StackPanel Grid.Row="1" VerticalAlignment="Stretch">
  <Grid Name="mygrid" Height="490">
    <Grid.RowDefinitions>
      <RowDefinition Height="*"/>
      <RowDefinition Height="*"/>
      <RowDefinition Height="*"/>
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="*"/>
      <ColumnDefinition Width="*"/>
    </Grid.ColumnDefinitions>
  </Grid>
</StackPanel>

Though with c# i am not getting to any solution. I tried with this attempt, though came to no conclusion

mygrid.ColumnDefinitions

Can somebody point me into the right direction?

`Grid` isn't really intended for that. Regardless, what was wrong with your attempt? — BradleyDotNET, Dec 16 '14 at 19:15
@RobertHarvey For dynamic layout? `StackPanel` for one. The only thing `Grid` buys you here is the even spacing, which you *can* write a custom panel for. It mostly depends on what he is *actually* trying to accomplish. — BradleyDotNET, Dec 16 '14 at 19:18
@BradleyDotNET i want the layout to change i.e from 3x3 to a 4x4 so somehow i need to set this xaml line '' in c# code in my class that i get the same result. — Daybreak, Dec 16 '14 at 19:23
Couldn't you just add a `ColumnDefinition` object to the collection? I still don't understand what is going wrong with your attempt (regardless of whether or not its the correct approach) — BradleyDotNET, Dec 16 '14 at 19:24
@BradleyDotNET maybe my approach wasn't wrong, it's only i don't know how to write the proper line of code to add the object to the collection. — Daybreak, Dec 16 '14 at 19:29

score 1 · Accepted Answer · edited May 23 '17 at 12:28

It should be straightforward to change the column definitions. ColumnDefinitionCollection implements IList<ColumnDefinition>, so you can treat it like normal lists in .Net.

Add:

var newColumn = new ColumnDefinition { Width = new GridLength(1, GridUnitType.Star) };
mygrid.ColumnDefinitions.Add(newColumn);

Remove:

mygrid.ColumnDefinitions.RemoveAt(mygrid.ColumnDefinitions.Count - 1);

(Note: you might also want to consider using an attached property to bind the number of rows/columns -- see here for example.)

I need my WPF grid control to be dynamically sizable (more or less rows and columns)

1 Answers1