Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You cannot delete an object from a collection during enumeration. You cannot modify the collection at all. That will cause an error(<em>Collection was modified; enumeration operation may not execute</em>). But you could add the objects that you want to delete/remove to another collection:</p> <pre><code>Dim removeEnemies = New List(Of enemy) For Each enemy As enemy In lstEnemy ' ... ' If enemy.enemy.Left &lt; 0 Then removeEnemies.Add(enemy.enemy) End If Next For Each enemy In removeEnemies lstEnemy.Remove(enemy) Me.Controls.Remove(enemy.enemy) Next </code></pre> <p>These methods will cause a list to change it's version(which is checked during enumeration):</p> <ul> <li>Add</li> <li>Clear</li> <li>Insert</li> <li>InsertRange</li> <li>Remove</li> <li>RemoveRange</li> <li>RemoveAt</li> <li>Reverse</li> <li>[the Indexer setter]</li> <li>Sort</li> </ul> <p>Another option is to use a <code>For-Loop</code> and loop it backwards:</p> <pre><code> For i As Int32 = lstEnemy.Count - 1 To 0 Step -1 Dim enemy = lstEnemy(i) ' ... ' If enemy.enemy.Left &lt; 0 Then lstEnemy.Remove(enemy) Me.Controls.Remove(enemy.enemy) End If Next </code></pre> <p>This will not raise that error but it's not as readable. You need to go from <code>list.Count - 1</code> To <code>0</code> because you want to remove items which would change the <code>Count</code> property and an index that was available before the item was removed causes now an <code>ArgumentOutOfRangeException</code>.</p> <p>Last but not least, you can use <a href="http://msdn.microsoft.com/en-us/library/wdka673a(v=vs.110).aspx" rel="noreferrer"><code>List.RemoveAll</code></a>:</p> <pre><code>lstEnemy.RemoveAll(Function(enemy) enemy.enemy.Left &lt; 0) </code></pre>
    singulars
    1. This table or related slice is empty.
    1. PORemove an object when in a for each loop
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USTim Schmelter
    1. USTim Schmelter
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO+1 Great Answer
      singulars
      1. PO
      1. USMatt Wilko
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload