Question

My ObservableCollection has three items, and the rows are consistently shown in the datagrid.
I cannot turn into edit mode a single cell of my DataGrid. I tried click, click-click, double-click, F2,…, but the whole row stay selected. How can I let the user edit the datagrid.
I found similar datagrid edit-questions in other posts but no-one solved my problem. Here is the code (WPF NetFramework 4.5). Pursposely, only the first column is non-editable (readonly).

<DataGrid Name="myDataGrid" Grid.Row="2" AutoGenerateColumns="False" ItemsSource="{Binding}" IsReadOnly="False">
    <DataGrid.Columns>
        <DataGridTemplateColumn Header="name" IsReadOnly="True" Width="200"  >
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Name}"/>
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="Formulation" Width="100" IsReadOnly="False">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding FormulationStr}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding FormulationStr}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
        <DataGridTemplateColumn Header="volume Diff" Width="100" IsReadOnly="False">
            <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding volumeDiff}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellTemplate>
            <DataGridTemplateColumn.CellEditingTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding volumeDiff}" />
                </DataTemplate>
            </DataGridTemplateColumn.CellEditingTemplate>
        </DataGridTemplateColumn>
    </DataGrid.Columns>
</DataGrid>

Answer 1

You have placed TextBlock in cell template as well as in cell editing template. That’s why you are not noticing any change on pressing F2 and double-clicking the cell since no matter what it will always be TextBlock which you can’t edit.

Either placed TextBox in your CellEditingTemplate like this –

<DataGridTemplateColumn Header="Formulation" Width="100" IsReadOnly="False">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding FormulationStr}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
    <DataGridTemplateColumn.CellEditingTemplate>
        <DataTemplate>
            <TextBox Text="{Binding FormulationStr}" />
        </DataTemplate>
    </DataGridTemplateColumn.CellEditingTemplate>
</DataGridTemplateColumn>

Or either simply use the DataGridTextColumn in place of DataGridTemplateColumn which internally provides the support what are you trying to achive by the above code –

<DataGridTextColumn Header="Formulation" Width="100" IsReadOnly="False" Binding="{Binding FormulationStr}" />