сделал вот так 
| Код |
#region Mouse Move
void myimg_MouseUp(object sender, MouseButtonEventArgs e)
{
((Image)sender).ReleaseMouseCapture();
}
void myimg_MouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
if (((Image)sender).IsMouseCaptured)
{
Point mouseCurrent = e.GetPosition(this);
double Left = mouseCurrent.X - canvasLeft;
double Top = mouseCurrent.Y - canvasTop;
((Image)sender).SetValue(Canvas.LeftProperty, canvasLeft + Left);
((Image)sender).SetValue(Canvas.TopProperty, canvasTop + Top);
canvasLeft = Canvas.GetLeft(((Image)sender));
canvasTop = Canvas.GetTop(((Image)sender));
}
}
}
void myimg_MouseDown(object sender, MouseButtonEventArgs e)
{
mouseClick = e.GetPosition(null);
canvasLeft = Canvas.GetLeft(((Image)sender));
canvasTop = Canvas.GetTop(((Image)sender));
((Image)sender).CaptureMouse();
}
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