Hi,

I have a form with two listviews. The second listview loads items based on the focused item of the first listview. I have the following code to check the items in the first listview:
I have an object reference not set to an instance of object error caused by the line listView1.FocusedItem.EnsureVisible(), but the strange thing is that I have assigned the focused item property of the listview and also set the listview item to be focused by using the focus method in the code, and the focuseditem is still null when I checked it with VS debugger. I have spent many hours on this and couldn't figure out why I have this exception. Does anybody know how to resolve this?

Thanks in advance!

I had also tried setting the form focus first as my form inherits two other custom forms, but that also did not work.

No repro.  What View are you using?  Just in case: use EnsureVisible() before setting the focus.

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Hans Passant.

Hi Nobugz,

Thanks for your reply. My listviews have detail views. Using EnsureVisible before the focus causes the exception as well, the focusedItem property is somehow always set to nothing. When I tried to set it in debugging mode I got a message : operation "=" not defined for listviewitem and listviewitem, and the property continues to be nothing.  

Hi Jerry_Hsi,

Based on my understanding, the root cause is the code snippet below:

If listView1.FocusedItem Is Nothing Then

          listView1.FocusedItem = listView1.Items.Item(0)        

End If

 

Since the FocusedItem property of ListView is read only, we cannot set it. Instead, we need to write the code below:

listView1.Items.Item(0).Focused = True

 

You can get more about FocusedItem from:

http://msdn.microsoft.com/en-us/library/system.windows.forms.listview.focuseditem(VS.71).aspx

 

Regards,

Aland Li

 

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