WPF使用异步绑定数据

<>  

    <!--Data Binding-->  

    <ObjectDataProvider x:Key="data_Province" ObjectType="{x:Type dao:RegionDAO}" MethodName="GetAllProvince" IsAsynchronous="True" />  

    <ObjectDataProvider x:Key="data_City" ObjectType="{x:Type dao:RegionDAO}" MethodName="GetCitiesFromProvince">  

        <>  

            <sys:Int32>0</sys:Int32>  

        </>  

    </ObjectDataProvider>  

    <ObjectDataProvider x:Key="data_County" ObjectType="{x:Type dao:RegionDAO}" MethodName="GetCountiesFromCity">  

        <>  

            <sys:Int32>0</sys:Int32>  

        </>  

    </ObjectDataProvider>  

    <ObjectDataProvider x:Key="data_Workshop" ObjectType="{x:Type dao:WorkshopDAO}" MethodName="GetWorkshopFromRegion">  

        <>  

            <sys:Int32>0</sys:Int32>  

            <sys:Int32>0</sys:Int32>  

            <sys:Int32>0</sys:Int32>  

        </>  

    </ObjectDataProvider>  

</>