get key in animation curve

I try to get key in animation curve.

AnimationClipCurveData[] animationCurveData = AnimationUtility.GetAllCurves( m_animationClip , true );

         for( int ii = 0 ; ii < m_checkArray.Length ; ii ++ ) 
         {
             if( m_checkArray[ ii ] )
             { 
                 foreach( AnimationClipCurveData x in animationCurveData ) 
                 {
                     if( x.propertyName == "m_LocalEulerAnglesHint.x" )//m_LocalRotaion.x
                     {
                         Debug.Log( x.curve.keys.Length );
                         for( int jj = 0 ; jj < x.curve.keys.Length ; jj ++ )
                         {
                             Debug.Log( x.curve.keys[ jj ].time ); 
                             Debug.Log( x.curve.keys[ jj ].value );

                         }
                     }
                 }
             } 

I want set the rotation angle. so I show the log about key. but the number of key( array ) is inconsistent with I saw in the Animation window. How can I get the key and set it by script.