为什么绑定对WPF DataGrid上的DataGrildTemplateColumn不起作用？

Question

I have a DataGrid defined in a WPF UserControl (MVVM). I am attempting to use DataGridTemplateColumns to define DataGrid content.

Here is what my the data looks like in my ViewModel:

public class CompanyClass
{
   public string Name { get; set;}
   public string Location { get; set; }
}

public ObservableCollection<CompanyClass> CompanyList = // Fill with Data;

Here is what the DataGrid definition looks like in XAML:

<Grid Name="SampleGrid"
      Width="{Binding ActualWidth, ElementName=NegativeAccountsBalances}" 
      HorizontalAlignment="Stretch" 
      VerticalAlignment="Stretch">
  <DataGrid Name="SampleDataGrid"
            AutoGenerateColumns="False"
            ItemsSource="{Binding CompanyList}"
            Width="{Binding Path=ActualWidth, RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=Grid,AncestorLevel=1}}"
            IsReadOnly="True"
            SelectionMode="Extended"
            SelectionUnit="CellOrRowHeader"
            HorizontalScrollBarVisibility="Auto"  
            VerticalScrollBarVisibility="Auto">
    <DataGrid.Columns>
      <DataGridTemplateColumn Width="SizeToCells" IsReadOnly="True">
        <DataGridTemplateColumn.CellTemplate>
          <DataTemplate>
            <StackPanel Orientation="Vertical">
              <TextBlock Name="txtCompanyName" Text="{Binding Path=Name}" Height="200" Width="200"/>
              <TextBlock Text="{Binding Location}" Height="20" Width="20"/>
            </StackPanel>
          </DataTemplate>
        </DataGridTemplateColumn.CellTemplate>
      </DataGridTemplateColumn>
    </DataGrid.Columns>
  </DataGrid>
</Grid>

For some reason I can't seem to get the binding working for the TextBlock controls within my DataTemplate . I'm setting the ItemSource to the collection of "Company" contained in my ViewModel.

What am I missing/doing wrong here?

I don't see any errors in the VS output window. If I try to bind a TextBlock to a bogus value, I still don't see any errors. Somehow I don't seem to have my binding set up correctly.

Can someone please point me the right direction?

Thanks

Answer 1

CompanyList is a field. You can't bind to fields. You can only bind to properties. It needs a getter and a setter.

Answer 2

Make sure that you initialize the CompanyList property only once , either in the constructor or by using the initializer syntax that was introduced in C#6:

public class ViewModel
{
    public ViewModel()
    {
        CompanyList = new ObservableCollection<CompanyClass>();
        //popuoate collection...
        CompanyList.Add(new CompanyClass() { Name = "test...." });
    }
    public ObservableCollection<CompanyClass> CompanyList { get; private set; }
}

C#6+:

public ObservableCollection<CompanyClass> CompanyList { get; } = new ObservableCollection<CompanyClass>();