BindsDirectlyToSource主要用於ObjectDataProvider，繫結到provide自身，而不是provider所包含的物件

<Window.Resources>
<ObjectDataProviderx:Key="odp"ObjectType="{x:Typelocal:Calculator}"MethodName="Add">
<ObjectDataProvider.MethodParameters>
<system:String>0</system:String>
<system:String>
 
0</system:String>
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
</Window.Resources>
<StackPanel>
<TextBoxx:Name="textBox1"Margin="5"Text="{BindingSource={StaticResourceodp},Path=MethodParameters[0],BindsDirectlyToSource=true,UpdateSourceTrigger=PropertyChanged}
 
"/>