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我有一个 McContainer 类,如下所示:

package  
{
import flash.display.MovieClip;
public class McContainer extends MovieClip
{
     public var body_Mc:MovieClip; 


    public function McContainer()
    {


    }

}

}

现在我想将一个 MovieClip 强制转换为 McContainer :

var a:MovieClip 

var b:AppContainer 

b= AppContainer(a) ;

trace(a);

但我得到运行时错误:

TypeError: Error #1034: Type Coercion failed: cannot convert    
flash.display::MovieClip@2bdbe041 to McContainer.
at Untitled_fla::MainTimeline/frame1()

如何将 MovieClip 强制转换为 McContainer ?

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