问题
I have some controls added in a stackpanel programmatically. What i want to do is that i want one of the controls in this stackpanel to be placed over another control. Specifically, I want to place button over an image in this stack panel. I couldn't find zindex property in c# codebehind. Although it seems very simple problem but i am unable to find any clue to solve this problem. Anyone please......??
回答1:
Try placing all your controls on Canvas. Then you can set Zindex with:
this.controlName.SetValue(Canvas.ZIndexProperty, 10d);
回答2:
Only the Canvas panel supports a ZIndex property. Stackpanel doesn't because each item is placed one after the other in the panel so they shouldn't overlap each other. This can be a little annoying at times when you have animated transforms moving the items about because the previous assumption isn't actually true.
In general though if you need to place items in a visual stack the Stackpanel isn't the right place for it. Perhaps a Canvas or you could use a Grid where the oridinal position of a element determines its "zorder" in a cell.
回答3:
From xaml:
<StackPanel Canvas.ZIndex="1">
</StackPanel>
来源：https://stackoverflow.com/questions/1802108/how-can-we-change-zindex-of-a-silverlight-control-programmatically