Edititem is not allowed for this view list

Question

I have tried for hours and hours but I cannot edit the column quantity in datagrid, whenever I do it gives me an error saying that

An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll Additional information: 'EditItem' is not allowed for this view.

My xaml code is

<DataGrid EnableRowVirtualization="True" Grid.Row="3" Grid.ColumnSpan="2" AutoGenerateColumns="False" Name="DataGrid1" IsReadOnly="False" ItemsSource="{Binding Products}" Margin="10,10,10,10" PreviewKeyDown="DataGrid1_PreviewKeyDown" SelectionChanged="DataGrid1_SelectionChanged" CellEditEnding="DataGrid1_CellEditEnding" CanUserAddRows="True" CanUserDeleteRows="True" BeginningEdit="DataGrid1_BeginningEdit" >
    <DataGrid.Columns>
        <DataGridTextColumn Header="Item Name" IsReadOnly="True" Binding="{Binding Path=ItemName}" Width="*"></DataGridTextColumn>
            <DataGridTextColumn Header="Item Price" IsReadOnly="True"  Binding="{Binding Path=ItemPrice}" Width="*"></DataGridTextColumn>
            <DataGridTextColumn x:Name="QuantityColumn" Header="Quantity" IsReadOnly="False"  Binding="{Binding Path=Quantity, Mode=TwoWay}" Width="*"></DataGridTextColumn>
            <DataGridTextColumn Header="Total Price" IsReadOnly="True" Binding="{Binding Path=TotalPrice}" Width="*">
        </DataGridTextColumn>
    </DataGrid.Columns>
</DataGrid>

and here is C# code

List<AddItem> DATA = new List<AddItem>()
{
    new AddItem()
    {
        ItemName = ItemName.Text.ToString(),
        ItemPrice = float.Parse(ItemPrice.Text.ToString()),
        Quantity = quantity.Text,
        TotalPrice = CalculateTotalPrice()
    }
};
DataGrid1.Items.Add(DATA);

public class AddItem
{
    public string ItemName { get; set; }
    public float ItemPrice { get; set; }
    public string Price { get; set; }
    public string Quantity { get; set; }
    public decimal TotalPrice { get; set; }
}

Where am I going wrong? I have tried observable collection also still no solution? Any Help will be appreciated.

Real answer: https://stackoverflow.com/a/19334755/1599699 – Andrew Jun 27 '18 at 17:56 — Andrew, Jun 27 '18 at 17:56

Jim · Accepted Answer · 2016-11-27T17:26:50.423

4

Assign the List<AddItem> list to the ItemSource instead of Add like so:

Use

DataGrid1.ItemsSource = DATA;

instead of

DataGrid1.Items.Add(DATA);

Other improvements to your code:

Use decimal type for all prices (always)
Use int type for quantity since quantity represent a number

edited Nov 27 '16 at 17:26

answered Nov 27 '16 at 17:17

Jim

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But then i wont be able to add items one by one if i make it to itemsource – Nelson Cajetin Diego Alfonso Nov 28 '16 at 04:27
@NelsonCajetinDiegoAlfonso use a `BindingList` instead of `List`, link it as i mentioned in my answer. You will be able to add items later with e.g. `DATA.Add(new AddItem { ItemName = "foo", ItemPrice = 160 });` once it is binded. When you add it to the list ... not directly to the datagrid. – Jim Nov 28 '16 at 04:45
@NelsonCajetinDiegoAlfonso be more precise ;-) what about it ? – Jim Nov 28 '16 at 04:56
Should i add the DATA to the data table and then bind it to the itemsource? will it be better? – Nelson Cajetin Diego Alfonso Nov 28 '16 at 04:59
@NelsonCajetinDiegoAlfonso nope that doesn't matter – Jim Nov 28 '16 at 05:00
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/129188/discussion-between-jim-and-nelson-cajetin-diego-alfonso). – Jim Nov 28 '16 at 05:03

Edititem is not allowed for this view list

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