System.Text.StringBuilder.this C# (CSharp) Метод

		public char this [int index] {
			get {
				if (index >= _length || index < 0)
					throw new IndexOutOfRangeException();

				return _str [index];
			} 

			set {
				if (index >= _length || index < 0)
					throw new IndexOutOfRangeException();

				if (null != _cached_str)
					InternalEnsureCapacity (_length);
				
				_str.InternalSetChar (index, value);
			}
		}