要为ArrayList创建一个只读包装器,代码如下-
using System; using System.Collections; public class Demo { public static void Main(){ ArrayList list = new ArrayList(); list.Add("One"); list.Add("Two"); list.Add("Three"); list.Add("Four"); list.Add("Five"); list.Add("Six"); list.Add("Seven"); list.Add("Eight"); Console.WriteLine("ArrayList elements..."); foreach(string str in list){ Console.WriteLine(str); } Console.WriteLine("ArrayList is read-only? = "+list.IsReadOnly); } }
输出结果
这将产生以下输出-
ArrayList elements... One Two Three Four Five Six Seven Eight ArrayList is read-only? = False
现在让我们来看另一个示例-
using System; using System.Collections; public class Demo { public static void Main(){ ArrayList list = new ArrayList(); list.Add("One"); list.Add("Two"); list.Add("Three"); list.Add("Four"); list.Add("Five"); list.Add("Six"); list.Add("Seven"); list.Add("Eight"); Console.WriteLine("ArrayList elements..."); foreach(string str in list){ Console.WriteLine(str); } Console.WriteLine("ArrayList is read-only? = "+list.IsReadOnly); ArrayList list2 = ArrayList.ReadOnly(list); Console.WriteLine("ArrayList is read-only now? = "+list2.IsReadOnly); } }
输出结果
这将产生以下输出-
ArrayList elements... One Two Three Four Five Six Seven Eight ArrayList is read-only? = False ArrayList is read-only now? = True