Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>You need to use the collection that's bound - not the 'Items' property on the grid. ItemsSource will point to your collection that is bound:</p> <pre><code>SomeGrid.ItemsSource = SomeCollection; SomeCollection.Add(new ItemOfTheRightType()); </code></pre> <p>or</p> <pre><code>(SomeGrid.ItemsSource as SomeCollection).Add(new ItemOfTheRightType()); </code></pre> <p>The error says that you can't use Grid.Items if you are binding using Grid.ItemsSource</p> <p>Edit:</p> <p>If you don't know the item type at runtime (maybe because this is a 3rd party using the control etc and you want a generic add method) you need to call the .Add method on the underlying interface. Most list types inherit from IList in the .NET framework</p> <p>I'm no VB expert, I much prefer c# so I'll give you the c#. You need to check for the underlying type first:</p> <p>in c#</p> <pre><code>if(grid.ItemsSource is IList) { (grid.ItemsSource as IList).Add(new childType()); &lt;-- other issue here.. } </code></pre> <p>The problem you have though is that if you are adding a new item to the collection and you don't know the list type, IList requires an instance of the object to add to the list</p> <ul> <li>solution is to use reflection:</li> </ul> <p><a href="https://stackoverflow.com/questions/511315/dynamically-creating-a-new-instance-of-ilists-type">Dynamically creating a new instance of IList&#39;s type</a></p> <p>An interesting late answer is:</p> <pre><code>var collectionType = targetList.GetType().GetProperty("Item").PropertyType; var constructor = collectionType.GetConstructor(Type.EmptyTypes); var newInstance = constructor.Invoke(null); </code></pre> <p>Which might work</p>
    singulars
    1. This table or related slice is empty.
    1. POAdd new row to Datagrid in a UserControl WPF/VB
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USCommunity
    1. USCharleh
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POAdd new row to Datagrid in a UserControl WPF/VB
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COHey Charleh, Thanks for the response and explaining the error. I've moved the ItemSource declaration out of XAML and into code as you suggest (Me.dgMain.ItemsSource = MyItemsSource) but the collection (MyItemsSource as IEnumerable) doesn't have an "add" function associated with it. What am I missing!?
      singulars
      1. PO
      1. USqu1ckdry
    2. COI didn't say to move the delcaration out of XAML, by all means keep it in there. The less code behind the better. You need to be casting to your bound type - is the type of the collection that is bound to the grid an ObservableCollection<x> where x is the item type? If so you need to cast to that - that will have the .Add method
      singulars
      1. PO
      1. USCharleh
    3. COOk thanks. How can I cast if I don't know what the item type is? I've added a typical use of the user control to my original question
      singulars
      1. PO
      1. USqu1ckdry
 

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