Custom data grid template column check box isn't binding to object when DatagridCheckboxColumn is correctly binding?

Question

I have a custom column I am trying to make in WPF.

<DataGrid.Columns>
    <DataGridTemplateColumn>
        <DataGridTemplateColumn.Header>
            <CheckBox x:Name="checkAll" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked"></CheckBox>
        </DataGridTemplateColumn.Header>
        <DataGridTemplateColumn.CellTemplate >
           <DataTemplate>
                <CheckBox IsChecked="{Binding IsSelected, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" HorizontalAlignment="Center" />
            </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
    </DataGridTemplateColumn>
    <DataGridTextColumn Header="#" Binding="{Binding userFriendlyId}" IsReadOnly="True"/>
    <DataGridTextColumn Header="Log Number" Binding="{Binding logNumber}" />
</DataGrid.Columns>

Both of the DataGridTextColumns are correctly bound to properties of my object and if I swap out my custom column for a DataGridCheckboxColumn it binds properly. I am trying to use this column because I want to have a check all/uncheck all option for the datagrid. Also it only takes one click to trigger these checkboxes as opposed to using the DataGridCheckboxColumn.

I use this code to asssign the ItemSource of the data grid:

DataGrid.ItemsSource = samples;
DataGrid.Items.Refresh();

I also currently have this.DataContext = this; although that doesn't seem to be making any sort of difference.

EDIT: Data Model that is displaying in the grid:

public class Sample
{
    public bool isSelected { get; set; }
    public int userFriendlyId { get; set; }
    public string logNumber { get; set; }
}

Answer 1

将绑定设置为IsChecked="{Binding isSelected}"

绑定中的属性名称区分大小写，因此如果对象模型使用isSelected，则绑定也应该是绑定。