How to remove DataGrid's blank row when binding to a ObservableCollection?

Question

I'm getting nuts here with this:

ObservableCollection<Employee> list = new ObservableCollection<Employee>();
dgEmployees.ItemsSource = list;

When you debug the list variable, it's empty (list.Count =0), but then I bind it to a DataGrid (WPFToolkit), it shows me a blank row.

In immediate window, for dgEmployees.Items it's showing:

dgEmployees.Items[0]
{NewItemPlaceholder}

and

dgEmployees.Items[0].GetType()
{Name = "NamedObject" FullName = "MS.Internal.NamedObject"}
[System.RuntimeType]: {Name = "NamedObject" FullName = "MS.Internal.NamedObject"}

It seems to happen after I've put this Datagrid into a TabControl, but I'm not sure it has something to do with it.

Does anyone know how to remove this blank row?

I got the exception `System.InvalidCastException: 'Unable to cast object of type 'MS.Internal.NamedObject' to type MyClass` in external code through one of my bindings. Found out this extra empty line was the culprit! But the answer of Pablonete was better for me. — ffonz, Jan 15 '22 at 19:34

score 99 · Answer 1 · answered Feb 21 '11 at 09:16

99

The same problem persist in WPF 4.0 version of DataGrid, and it is caused by the add-new row which it shows automatically for ObservableCollection ItemsSource. Setting IsReadOnly as True it's too radical IMHO.
I solved it by disabling CanUserAddRows property if you don't need that behavior, but you still want cells to be modified:

CanUserAddRows="False"

answered Feb 21 '11 at 09:16

Pablonete

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agreed unless it is truly readonly then that seems over kill. – Jon Mar 23 '11 at 12:23
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Thanks, this answer helped me a lot more than the IsReadOnly which in my case had some side effects that I didn't want. – Dessus Jul 07 '13 at 03:04
3

Can we mark this as the answer as IsReadOnly does have side-effects while this does not? – Shreyas Dec 23 '14 at 14:47

score 25 · Accepted Answer · answered Aug 26 '09 at 20:39

25

I've got it

on Datagrid XAML, put the attribute:

IsReadOnly="True"

answered Aug 26 '09 at 20:39

Junior Mayhé

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This is not correct answer. This is correct - https://stackoverflow.com/a/5064128/987850 – 23W Feb 13 '23 at 13:43

score 5 · Answer 3 · edited Jan 14 '17 at 13:24

5

CanUserAddRows="False" and IsReadOnly="True" combination of both is better to ensure any additional inconveniences.

edited Jan 14 '17 at 13:24

KyloRen

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answered Mar 27 '15 at 10:37

Sawarkar vikas

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you are suggesting he use two overlapping functionalities where either one will suffice and in fact `IsReadOnly = true` will remove other functionality with no gain at all. – NappingRabbit Oct 24 '17 at 18:12

How to remove DataGrid's blank row when binding to a ObservableCollection?

3 Answers3

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