2263this.items = items;

2276if (items != null) 2278Object item = items.GetValue(a); 2279items.SetValue(items.GetValue(b), a); 2280items.SetValue(item, b); 2292if(items != null) 2294Object t2 = items.GetValue(i); 2295items.SetValue(items.GetValue(j), i); 2296items.SetValue(t2, j); 2387if (items != null) 2389Object item = items.GetValue(i); 2390items.SetValue(items.GetValue(j), i); 2391items.SetValue(item, j); 2523Object dt = (items != null)? items.GetValue(lo + i - 1) : null; 2537if(items != null) 2538items.SetValue(items.GetValue(lo + child - 1), lo + i - 1); 2542if(items != null) 2543items.SetValue(dt, lo + i - 1); 2554dt = (items != null)? items.GetValue(i + 1) : null; 2559if(items != null) 2560items.SetValue(items.GetValue(j), j + 1); 2565if(items != null) 2566items.SetValue(dt, j + 1);