c# - WPF DataGrid从DataGridTemplateColumn获取单元格内容

我有一个绑定到dataGrid的dataTable：

CS：

SQLiteDataAdapter sQLiteDataAdapter = new SQLiteDataAdapter(_command);
DataTable dataTable = new DataTable("Inventory");
sQLiteDataAdapter.Fill(dataTable);
for (int i = 0; i < dataTable.Rows.Count; i++)
{
    dgridTenderInventory.Items.Add(new
      {
         ID = dataTable.Rows[i]["id"],                            
         Specs = dataTable.Rows[i]["specs"],
         Image = dataTable.Rows[i]["image"]                            
       });
}

XAML：

 <DataGrid x:Name="dgridTenderInventory" RowHeaderWidth="0"  MouseDown="DgridTenderInventory_MouseDown">
    <DataGrid.Columns>
       <DataGridTextColumn Header="ID" Binding="{Binding ID}"/>
       <DataGridTemplateColumn Header="Image">
           <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <Image Height="50" Source="{Binding Image, Converter={StaticResource BinaryImageConverter}}"/>
                </DataTemplate>
           </DataGridTemplateColumn.CellTemplate>
       </DataGridTemplateColumn>
       <DataGridTemplateColumn Header="Specs">
           <DataGridTemplateColumn.CellTemplate>
                <DataTemplate>
                    <TextBlock Text="{Binding Specs}" TextWrapping="Wrap"/>
                </DataTemplate>
           </DataGridTemplateColumn.CellTemplate>
       </DataGridTemplateColumn>
     </DataGrid.Columns>
  </DataGrid>

我可以通过选择像这样的行来获取ID（DataGridTextColumn）的单元格值：

object item = dgridTenderInventory.SelectedItem;
string ID = dgridTenderInventory.SelectedCells[0].Column.GetCellContent(item) as TextBlock).Text;

但是，当我想要获取规格（作为文本）或图像（作为图像）时，它说“ ...返回null”。可能是由于DataGridTemplateColumn导致的。如何从DataGridTemplateColumn内部获取价值？（特别是，我需要获取图像并设置一个图像（称为imgPopup），就像dataGrid图像单元格一样）

string specs= dgridTenderInventory.SelectedCells[2].Column.GetCellContent(item) as TextBlock).Text; // return null
imgPopup.Source = dgridTenderInventory.SelectedCells[1].Column.GetCellContent(item) as Image).Source ; // ?? how does it be implemented?

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