How to get all the text of a pView implement IVsTextView interface

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Visual-Studio

extension

I would like to get all the text of an active textView in Visual Studio text editor,See the Code,in the Method OnRegisterView of the class TextManagerEventSink,I want to do something with "pView" to get all the text.I have looked up all the Method of the IVsTextView interface, however, nothing useful,Could anyone help me ?

public class TextManagerEventSink : IVsTextManagerEvents
       {
           public void OnRegisterMarkerType(int iMarkerType)
           {

           }
           public void OnRegisterView(IVsTextView pView)
           {

               CommandFilter filter = new CommandFilter();
               pView.AddCommandFilter(filter, out filter.NextCommandTarget);


           }

           public void OnUnregisterView(IVsTextView pView)
           {
           }

           public void OnUserPreferencesChanged(VIEWPREFERENCES[] pViewPrefs, FRAMEPREFERENCES[] pFramePrefs, LANGPREFERENCES[] pLangPrefs, FONTCOLORPREFERENCES[] pColorPrefs)
           {
           }
       }