将单个数据网格与列表和单个数据项绑定

我是WPF的新手，正在尝试将数据绑定到数据网格。我有一个绑定到Datagrid的项目列表。同一个数据网格也有几个列(2列)，这些列的值不是从列表中获得的，而是需要绑定到这两个数据网格列的单独值。有谁能帮我找到解决办法吗?下面是xaml代码:

ItemList是绑定到DataGrid的项列表。它有"PropertyName"answers"PropertyValue"这是绑定到数据网格列。

<DataGrid  x:Name="dtgridUpload"  AutoGenerateColumns="False" ItemsSource="{Binding ItemList}">
       <DataGrid.Columns>
            <DataGridTextColumn Binding="{Binding PropertyName}" IsReadOnly="True">
                  <DataGridTextColumn.Header>
                         <StackPanel Orientation="Horizontal">
                              <TextBlock Text="Name" />                                         
                        </StackPanel>
                 </DataGridTextColumn.Header>
            </DataGridTextColumn>
           <DataGridTextColumn Header="Value" Width="200" Binding="{Binding PropertyValue}"   IsReadOnly="True"/>
           <DataGridTextColumn Header="Unit"  Binding="{Binding PropertyUnit}" IsReadOnly="True"/>                               
           <DataGridTextColumn Header="Value1" Width="200"  IsReadOnly="{Binding Path=IsReadOnly}" Binding="{Binding PropertyName1}"/>
           <DataGridTextColumn Header="Unit1"  Binding="{Binding PropertyUnit1}"/>
     </DataGrid.Columns>
</DataGrid>

cs代码

  private List<DeviceData_VM> itemList;
    public List<DeviceData_VM> ItemList
    {
        get { return itemList; }
        set
        {
            itemList= value;
            NotifyPropertyChanged("ItemList");
        }
    }
     TextReader readStream = new StreamReader("output.xml");
     ItemList= (List<DeviceData_VM>)serialiser.Deserialize(readStream);

但是"PropertyName1"answers"PropertyValue1"是从其他变量中获得的。

   void GetFileData()
        {
           string[] readText = File.ReadAllLines(@"D:'WriteLines.txt");
                List<DeviceData_VM>  tempeDataLst = new List<DeviceData_VM>();
                for (var i = 0; i < readText.Length - 1; i++)
                {
                    if (readText[i][0] == ';' || readText[i][0] == '/' || readText[i][0] == '@' || readText[i][0] == '#' || readText[i][0] != 'A')
                        continue;
                    var cols = readText[i].Split(''t');
                    DeviceData_VM fileData = new DeviceData_VM();
                    fileData.PmName = cols[1];
                    fileData.PmValue = cols[2];                      
                    fileData.PmUnit = cols[4];
                    tempeDataLst.Add(fileData);
                   TabInfo tabCompInfo = new TabInfo();
                   foreach (var tabItem in LstTabInfo)
                    {
                        foreach (var devItem in tabItem.LstPmData1)
                        {
                            if(devItem.PmName == fileData.PmName)
                            {
                                if(fileData != null){
                                    tabCompInfo.RightData = fileData;                                       
                                    break;
                                }                                 
                            } 
                        } 
                   }
               }
           }

所以我有ProperName1和PropertyValue1在"RightData"。如何将这些绑定到数据网格列?