static void Main(string[] args)
{
ArrayList ls = new ArrayList();
ls.Add("苹果");
ls.Add("橘子");
ls.Add("芒果");
ls.Remove("橘子");
ls.AddRange(new object[] { "香蕉", "梨子" });
ls.RemoveAt(0);
if (!ls.Contains("橘子")) ls.Insert(0, "橘子");
Console.WriteLine(string.Empty);
foreach (string s in ls) Console.Write("{0}", s);
ls.Sort();
Console.WriteLine(string.Empty);
foreach (string s in ls) Console.Write("{0}", s);
string[] ar = (string[])ls.ToArray();
Array.Reverse(ar);
Console.WriteLine(string.Empty);
foreach (string s in ar) Console.Write("{0}", s);
}
这段程序运行时出错应该是string[] ar = (string[])ls.ToArray();这个类型转换有问题,可不知道怎么改,请高人指教!无法将System.object〔)强制转化成System.string[],应该怎么转化!
{
ArrayList ls = new ArrayList();
ls.Add("苹果");
ls.Add("橘子");
ls.Add("芒果");
ls.Remove("橘子");
ls.AddRange(new object[] { "香蕉", "梨子" });
ls.RemoveAt(0);
if (!ls.Contains("橘子")) ls.Insert(0, "橘子");
Console.WriteLine(string.Empty);
foreach (string s in ls) Console.Write("{0}", s);
ls.Sort();
Console.WriteLine(string.Empty);
foreach (string s in ls) Console.Write("{0}", s);
string[] ar = (string[])ls.ToArray();
Array.Reverse(ar);
Console.WriteLine(string.Empty);
foreach (string s in ar) Console.Write("{0}", s);
}
这段程序运行时出错应该是string[] ar = (string[])ls.ToArray();这个类型转换有问题,可不知道怎么改,请高人指教!无法将System.object〔)强制转化成System.string[],应该怎么转化!
string[]str=new string[al.Count];
object [] ar=al.ToArray();
for(int j=0;j<ar.Length;j++)
{
str[j]=Convert.ToString( ar[j]);
}
list.Add("橘子");
list.Add("苹果");
foreach(string s in list)
{
Console.WriteLine(s);
}
{
List<string> ls = new List<string>();
//ArrayList ls = new ArrayList();
ls.Add("苹果");
ls.Add("橘子");
ls.Add("芒果");
ls.Remove("橘子");
ls.AddRange(new string[] { "香蕉", "梨子" });
ls.RemoveAt(0); if (!ls.Contains("橘子"))
ls.Insert(0, "橘子");
Console.WriteLine(string.Empty); foreach (string s in ls)
Console.Write("{0}", s);
ls.Sort();
Console.WriteLine(string.Empty); foreach (string s in ls)
Console.Write("{0}", s); string[] ar = (string[])ls.ToArray(); Array.Reverse(ar);
Console.WriteLine(string.Empty); foreach (string s in ar)
Console.Write("{0}", s);
Console.Read();
}