WPF DataGrid：默認取消第一行選擇

Question

在我的DataGrid中，第一行默認選中。我怎樣才能取消這個？

<Window x:Class="WpfApplication50.Window7" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:dg="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" 
    Title="Window7" SizeToContent="WidthAndHeight"> 
<Window.Resources> 
    <!--Data--> 
    <XmlDataProvider x:Key="MyData" XPath="/Info"> 
     <x:XData> 
      <Info xmlns=""> 
       <Item ID="ISBN 45-F1" Name="Winner" Price="$32.05" Author="Aka" Catalog="Business"/> 
       <Item ID="ISBN 54-32" Name="C++ Inside" Price="$10.00" Author="John" Catalog="Language"/> 
       <Item ID="ISBN 14-A0" Name="Java Inside" Price="$9.00" Author="Tom" Catalog="Language"/> 
       <Item ID="ISBN 56-78" Name="Stock Market" Price="$8.50" Author="Bob" Catalog="Business"/> 
       <Item ID="ISBN AA-02" Name="Guideline for Health" Price="$19.00" Author="Lee" Catalog="Health"/> 
       <Item ID="ISBN A4-07" Name="C# Inside" Price="$8.50" Author="Bob" Catalog="Language"/> 
      </Info> 
     </x:XData> 
    </XmlDataProvider> 
    <CollectionViewSource x:Key='src' Source="{Binding Source={StaticResource MyData}, XPath=Item}"> 
     <CollectionViewSource.GroupDescriptions> 
      <PropertyGroupDescription PropertyName="@Catalog"/> 
     </CollectionViewSource.GroupDescriptions> 
    </CollectionViewSource> 
    <!--Data--> 
</Window.Resources> 
<Grid> 
    <dg:DataGrid 
    AutoGenerateColumns="False" 
    Background="White" IsReadOnly="True" Padding="0" Margin="0" 
    BorderThickness="0" 
    GridLinesVisibility="None" 
    HorizontalScrollBarVisibility="Disabled" 
     HeadersVisibility="All" 
    ItemsSource='{Binding Source={StaticResource src}}' 
    SelectionMode="Single"  
    SelectionUnit="FullRow" 
    VerticalGridLinesBrush="DarkGray" 
    VerticalScrollBarVisibility="Disabled"> 
     <dg:DataGrid.Columns> 
      <dg:DataGridTextColumn Binding="{Binding XPath=@ID}" Header="ID"/> 
      <dg:DataGridTextColumn Binding="{Binding XPath=@Name}" Header="Name"/> 
      <dg:DataGridTextColumn Binding="{Binding XPath=@Price}" Header="Price"/> 
      <dg:DataGridTextColumn Binding="{Binding XPath=@id}" Header="Author"/> 
     </dg:DataGrid.Columns> 

    </dg:DataGrid> 
</Grid> 

Answer 1

xaml: 


<dg:DataGrid Name="SC_dgList" CanUserAddRows="False" Loaded="SC_dgList_Loaded"> 

---

CS：

private void SC_dgList_Loaded(object sender, RoutedEventArgs e) 
{ 
     SC_dgList.SelectedIndex = -1; 
}